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ibm ds8870 实施指南.pdf
Go to the current abstract on ibm.com/redbooks
Front cover
Contents
Notices
Trademarks
Preface
The team who wrote this book
Now you can become a published author, too!
Comments welcome
Stay connected to IBM Redbooks
Part 1 Concepts and architecture
Chapter 1. Introduction to the IBM System Storage DS8870
1.1 Introduction to the DS8870
1.1.1 Features of the DS8870
1.2 The DS8870 controller options and frames
1.3 DS8870 architecture and functions overview
1.3.1 Overall architecture and components
1.3.2 Storage capacity
1.3.3 Supported environments
1.3.4 Configuration flexibility
1.3.5 Copy Services functions
1.3.6 Resource Groups for copy services scope limiting
1.3.7 Service and setup
1.3.8 IBM Certified Secure Data Overwrite
1.4 Performance features
1.4.1 Sophisticated caching algorithms
1.4.2 Solid State Drives
1.4.3 Multipath Subsystem Device Driver
1.4.4 Performance for System z
1.4.5 Performance enhancements for IBM Power Systems
Chapter 2. IBM System Storage DS8870 models
2.1 The System Storage DS8870
2.2 Model overview
2.3 DS8870 Disk drive options
2.4 Additional licenses that are needed
Chapter 3. DS8870 hardware components and architecture
3.1 Frames: DS8870
3.1.1 Base frame: DS8870
3.1.2 Expansion frames
3.1.3 Rack operator panel
3.2 DS8870 architecture overview
3.2.1 The IBM POWER7 processor-based server
3.2.2 Peripheral Component Interconnect Express adapters
3.2.3 Storage facility processor complex
3.2.4 Processor memory and cache management
3.2.5 Flexible service processor and system power control network
3.3 I/O enclosures
3.3.1 DS8870 I/O enclosure
3.3.2 Host adapters
3.3.3 Device adapters
3.4 Disk subsystem
3.4.1 Disk enclosures
3.4.2 Disk drives
3.5 Power and cooling
3.6 Management console network
3.6.1 Ethernet switches
Chapter 4. RAS on IBM System Storage DS8870
4.1 Names and terms for the DS8870 storage system
4.2 RAS features of DS8870 CEC
4.2.1 POWER7 Hypervisor
4.2.2 POWER7 processor
4.2.3 AIX operating system
4.2.4 CEC dual hard disk drive rebuild
4.2.5 Cross Cluster communication
4.2.6 Environmental monitoring
4.2.7 Resource deallocation
4.3 CEC failover and failback
4.3.1 Dual operational
4.3.2 Failover
4.3.3 Failback
4.3.4 NVS and power outages
4.4 Data flow in DS8870
4.4.1 I/O enclosures
4.4.2 Host connections
4.4.3 Metadata checks
4.5 RAS on the HMC
4.5.1 Microcode updates
4.5.2 Call Home and Remote Support
4.6 RAS on the disk system
4.6.1 RAID configurations
4.6.2 Disk path redundancy
4.6.3 Predictive Failure Analysis
4.6.4 Disk scrubbing
4.6.5 Smart Rebuild
4.6.6 RAID 5 overview
4.6.7 RAID 6 overview
4.6.8 RAID 10 overview
4.6.9 Spare creation
4.7 RAS on the power subsystem
4.7.1 Components
4.7.2 Line power loss
4.7.3 Line power fluctuation
4.7.4 Power control
4.7.5 Emergency power off
4.8 RAS and Full Disk Encryption
4.8.1 Deadlock recovery
4.8.2 Dual platform Tivoli Key Lifecycle Manager servers
4.9 Other features
4.9.1 Internal network
4.9.2 Remote support
4.9.3 Earthquake resistance
Chapter 5. Virtualization concepts
5.1 Virtualization definition
5.2 The abstraction layers for disk virtualization
5.2.1 Array sites
5.2.2 Arrays
5.2.3 Ranks
5.2.4 Extent Pools
5.2.5 Logical volumes
5.2.6 Space Efficient volumes
5.2.7 Allocation, deletion, and modification of LUNs/CKD volumes
5.2.8 Logical subsystem
5.2.9 Volume access
5.2.10 Virtualization hierarchy summary
5.3 Benefits of virtualization
5.4 zDAC - z/OS FICON discovery and Auto-Configuration
5.5 EAV V2 - Extended Address Volumes
Chapter 6. IBM System Storage DS8000 Copy Services overview
6.1 Copy Services
6.2 FlashCopy and FlashCopy SE
6.2.1 Basic concepts
6.2.2 Benefits and use
6.2.3 FlashCopy options
6.2.4 FlashCopy SE-specific options
6.2.5 Remote Pair FlashCopy
6.3 Remote Mirror and Copy
6.3.1 Metro Mirror
6.3.2 Global Copy
6.3.3 Global Mirror
6.3.4 Metro/Global Mirror
6.3.5 Multiple Global Mirror sessions
6.3.6 Thin provisioning enhancements on open environments
6.3.7 GM and MGM improvement because of collision avoidance
6.3.8 z/OS Global Mirror
6.3.9 z/OS Metro/Global Mirror
6.3.10 Summary of Remote Mirror and Copy function characteristics
6.3.11 Consistency group considerations
6.3.12 GDPS on zOS environments
6.3.13 Tivoli Storage Productivity Center for Replication functionality
6.4 Resource Groups for copy services
Chapter 7. Architectured for Performance
7.1 DS8870 hardware: Performance characteristics
7.1.1 Vertical growth and scalability
7.1.2 DS8870 Fibre Channel switched interconnection at the back-end
7.1.3 Fibre Channel device adapter
7.1.4 Eight-port and four-port host adapters
7.2 Software performance: Synergy items
7.2.1 Synergy on System p
7.2.2 Synergy on System z
7.3 Performance considerations for disk drives
7.4 DS8000 superior caching algorithms
7.4.1 Sequential Adaptive Replacement Cache
7.4.2 Adaptive Multi-stream Prefetching
7.4.3 Intelligent Write Caching
7.5 Performance considerations for logical configuration
7.5.1 Workload characteristics
7.5.2 Data placement in the DS8000
7.5.3 Data placement
7.6 I/O Priority Manager
7.6.1 Performance policies for open systems
7.6.2 Performance policies for System z
7.7 IBM Easy Tier
7.7.1 IBM Easy Tier operating modes
7.7.2 IBM Easy Tier Statement of Direction
7.8 Performance and sizing considerations for open systems
7.8.1 Determining the number of paths to a LUN
7.8.2 Dynamic I/O load-balancing: SDD
7.8.3 Automatic port queues
7.8.4 Determining where to attach the host
7.9 Performance and sizing considerations for System z
7.9.1 Host connections to System z servers
7.9.2 Parallel Access Volume
7.9.3 z/OS Workload Manager: Dynamic PAV tuning
7.9.4 HyperPAV
7.9.5 PAV in z/VM environments
7.9.6 Multiple Allegiance
7.9.7 I/O priority queuing
7.9.8 Performance considerations on Extended Distance FICON
7.9.9 High Performance FICON for z
Part 2 Planning and installation
Chapter 8. DS8870 Physical planning and installation
8.1 Considerations before installation
8.1.1 Who should be involved
8.1.2 What information is required
8.2 Planning for the physical installation
8.2.1 Delivery and staging area
8.2.2 Floor type and loading
8.2.3 Overhead cabling features
8.2.4 Room space and service clearance
8.2.5 Power requirements and operating environment
8.2.6 Host interface and cables
8.2.7 Host adapter Fibre Channel specifics for open environments
8.2.8 FICON specifics on zOS environment
8.2.9 Best practice for host adapters
8.2.10 WWNN and WWPN determination
8.3 Network connectivity planning
8.3.1 Hardware Management Console and network access
8.3.2 IBM Tivoli Storage Productivity Center
8.3.3 DS command-line interface
8.3.4 Remote support connection
8.3.5 Remote power control
8.3.6 Storage area network connection
8.3.7 Tivoli Key Lifecycle Manager server for encryption
8.3.8 Lightweight Directory Access Protocol server for single sign-on
8.4 Remote mirror and copy connectivity
8.5 Disk capacity considerations
8.5.1 Disk sparing
8.5.2 Disk capacity
8.5.3 DS8000 Solid-State drive considerations
8.6 Planning for growth
Chapter 9. DS8870 HMC planning and setup
9.1 Hardware Management Console overview
9.1.1 Storage HMC hardware
9.1.2 Private Ethernet networks
9.2 Hardware Management Console software
9.2.1 DS Storage Manager GUI
9.2.2 Command-line interface
9.2.3 DS Open application programming interface
9.2.4 Web-based user interface
9.3 HMC activities
9.3.1 HMC planning tasks
9.3.2 Planning for microcode upgrades
9.3.3 Time synchronization
9.3.4 Monitoring DS8870 with the HMC
9.3.5 Call Home and remote support
9.4 HMC and IPv6
9.5 HMC user management
9.6 External HMC
9.6.1 External HMC benefits
9.7 Configuration worksheets
9.8 Configuration flow
Chapter 10. IBM System Storage DS8000 features and license keys
10.1 IBM System Storage DS8000 licensed functions
10.1.1 Licensing
10.1.2 Licensing: cost structure
10.2 Activating licensed functions
10.2.1 Obtaining DS8000 machine information
10.2.2 Obtaining activation codes
10.2.3 Applying activation codes by using the GUI
10.2.4 Applying activation codes by using the DS CLI
10.3 Licensed scope considerations
10.3.1 Why you have a choice
10.3.2 Using a feature for which you are not licensed
10.3.3 Changing the scope to All
10.3.4 Changing the scope from All to FB
10.3.5 Applying an insufficient license feature key
10.3.6 Calculating how much capacity is used for CKD or FB
Part 3 Storage configuration
Chapter 11. Configuration flow
11.1 Configuration worksheets
11.2 Configuration flow
Chapter 12. Configuring IBM Tivoli Storage Productivity Center 5.1 for DS8000
12.1 Introducing IBM Tivoli Storage Productivity Center 5.1
12.2 IBM Tivoli Storage Productivity Center Architecture
12.3 Adding a DS8000 storage system with IBM Tivoli Storage Productivity Center 5.1
12.4 Exploring DS8870 with IBM Tivoli Storage Productivity Center 5.1 web-based GUI
Chapter 13. Configuration by using the DS Storage Manager GUI
13.1 DS Storage Manager GUI overview
13.1.1 Accessing the DS GUI
13.1.2 DS GUI Overview window
13.2 User management by using the DS GUI
13.3 Logical configuration process
13.4 Examples of configuring DS8000 storage
13.4.1 Defining a storage complex
13.4.2 Creating arrays
13.4.3 Creating ranks
13.4.4 Creating Extent Pools
13.4.5 Configuring I/O ports
13.4.6 Configuring logical host systems
13.4.7 Creating fixed block volumes
13.4.8 Creating volume groups
13.4.9 Creating LCUs and CKD volumes
13.4.10 Additional tasks on LCUs and CKD volumes
13.5 Other DS GUl functions
13.5.1 Easy Tier
13.5.2 I/O Priority Manager
13.5.3 Checking the status of the DS8000
13.5.4 Exploring the DS8000 hardware
Chapter 14. Configuration with the DS Command-Line Interface
14.1 DS Command-Line Interface overview
14.1.1 Supported operating systems for the DS CLI
14.1.2 User accounts
14.1.3 User management by using the DS CLI
14.1.4 DS CLI profile
14.1.5 Configuring DS CLI to use a second HMC
14.1.6 Command structure
14.1.7 Using the DS CLI application
14.1.8 Return codes
14.1.9 User assistance
14.2 Configuring the I/O ports
14.3 Configuring the DS8000 storage for FB volumes
14.3.1 Creating arrays
14.3.2 Creating ranks
14.3.3 Creating Extent Pools
14.3.4 Creating FB volumes
14.3.5 Creating volume groups
14.3.6 Creating host connections
14.3.7 Mapping open systems host disks to storage unit volumes
14.4 Configuring DS8000 storage for CKD volumes
14.4.1 Create arrays
14.4.2 Ranks and Extent Pool creation
14.4.3 Logical control unit creation
14.4.4 Creating CKD volumes
14.4.5 Resource Groups
14.4.6 Performance I/O Priority Manager
14.4.7 Easy Tier
14.5 Metrics with DS CLI
14.6 Private network security commands
14.7 Copy Services commands
Part 4 Maintenance and upgrades
Chapter 15. Licensed machine code
15.1 How new microcode is released
15.2 Bundle installation
15.3 Concurrent and non-concurrent updates
15.4 Code updates
15.5 Host adapter firmware updates
15.6 Loading the code bundle
15.7 Post-installation activities
15.8 Summary
Chapter 16. Monitoring with Simple Network Management Protocol
16.1 Simple Network Management Protocol overview
16.1.1 SNMP agent
16.1.2 SNMP manager
16.1.3 SNMP trap
16.1.4 SNMP communication
16.1.5 SNMP Requirements
16.1.6 Generic SNMP security
16.1.7 Message Information Base
16.1.8 SNMP trap request
16.1.9 DS8000 SNMP configuration
16.2 SNMP notifications
16.2.1 Serviceable event that uses specific trap 3
16.2.2 Copy Services event traps
16.2.3 I/O Priority Manager SNMP
16.2.4 Thin Provisioning SNMP
16.3 SNMP configuration
16.3.1 SNMP preparation
16.3.2 SNMP configuration from the HMC
16.3.3 SNMP configuration with the DS CLI
Chapter 17. Remote support
17.1 Introduction to remote support
17.1.1 Suggested reading
17.1.2 Organization of this chapter
17.1.3 Terminology and definitions
17.2 IBM policies for remote support
17.3 VPN rationale and advantages
17.4 Remote connection types
17.4.1 Asynchronous modem
17.4.2 IP network
17.4.3 IP network with traditional VPN
17.4.4 AOS
17.5 DS8870 support tasks
17.5.1 Call Home and heartbeat: outbound
17.5.2 Data offload: outbound
17.5.3 Code download: inbound
17.5.4 Remote support: inbound and two way
17.6 Remote connection scenarios
17.6.1 No connections
17.6.2 Modem only
17.6.3 VPN only
17.6.4 Modem and network with no VPN
17.6.5 Modem and traditional VPN
17.7 Assist On-site
17.8 Further remote support enhancements
17.9 Audit logging
Chapter 18. DS8870 Capacity upgrades and CoD
18.1 Installing capacity upgrades
18.1.1 Installation order of upgrades
18.1.2 Checking how much total capacity is installed
18.2 Using Capacity on Demand
18.2.1 What is Capacity on Demand
18.2.2 Determining whether a DS8870 includes CoD disks
18.2.3 Using the CoD storage
Appendix A. Tools and service offerings
Planning and administration tools
Capacity Magic
Disk Magic
Storage Tier Advisor Tool
IBM Tivoli Storage FlashCopy Manager
IBM Service offerings
IBM Global Technology Services: Service offerings
IBM STG Lab Services: Service offerings
Abbreviations and acronyms
Related publications
IBM Redbooks publications
Other publications
Online resources
How to get IBM Redbooks publications
Help from IBM
Back cover
Front cover
IBM System Storage DS8870
Architecture and Implementation
Dual IBM POWER7 based controllers
with up to 1 TB of cache
400 GB SSDs with
Full Disk Encryption support
Improved Power Supplies and
extended Power Line Disturbance
ibm.com/redbooks
Bertrand Dufrasne
Pere Alcaide
Peter Kimmel
Istvan Paloczi
Akin Sakarcan
Roland Wolf
International Technical Support Organization
IBM System Storage DS8870 Architecture and
Implementation
January 2013
SG24-8085-00
Note: Before using this information and the product it supports, read the information in “Notices” on
page xi.
First Edition (January 2013)
This edition applies to DS8870 with Licensed Machine Code (LMC) 7.7.xx.xx (bundle version 87.xx.x)).
© Copyright International Business Machines Corporation 2013. All rights reserved.
Note to U.S. Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP Schedule
Contract with IBM Corp.
Contents
Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
The team who wrote this book . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
Now you can become a published author, too! . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi
Comments welcome. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi
Stay connected to IBM Redbooks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi
Part 1. Concepts and architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Chapter 1. Introduction to the IBM System Storage DS8870 . . . . . . . . . . . . . . . . . . . . . 3
1.1 Introduction to the DS8870 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1.1 Features of the DS8870 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 The DS8870 controller options and frames. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.3 DS8870 architecture and functions overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.3.1 Overall architecture and components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.3.2 Storage capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.3.3 Supported environments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.3.4 Configuration flexibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.3.5 Copy Services functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.3.6 Resource Groups for copy services scope limiting . . . . . . . . . . . . . . . . . . . . . . . . 18
1.3.7 Service and setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
1.3.8 IBM Certified Secure Data Overwrite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1.4 Performance features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1.4.1 Sophisticated caching algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1.4.2 Solid State Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1.4.3 Multipath Subsystem Device Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1.4.4 Performance for System z. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
1.4.5 Performance enhancements for IBM Power Systems . . . . . . . . . . . . . . . . . . . . . 21
Chapter 2. IBM System Storage DS8870 models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.1 The System Storage DS8870 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.2 Model overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.3 DS8870 Disk drive options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.4 Additional licenses that are needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Chapter 3. DS8870 hardware components and architecture. . . . . . . . . . . . . . . . . . . . . 33
3.1 Frames: DS8870 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.1.1 Base frame: DS8870. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.1.2 Expansion frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.1.3 Rack operator panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.2 DS8870 architecture overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
3.2.1 The IBM POWER7 processor-based server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
3.2.2 Peripheral Component Interconnect Express adapters . . . . . . . . . . . . . . . . . . . . 40
3.2.3 Storage facility processor complex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.2.4 Processor memory and cache management . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
3.2.5 Flexible service processor and system power control network . . . . . . . . . . . . . . . 43
3.3 I/O enclosures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
© Copyright IBM Corp. 2013. All rights reserved.
iii
3.3.1 DS8870 I/O enclosure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3.3.2 Host adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.3.3 Device adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3.4 Disk subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.4.1 Disk enclosures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.4.2 Disk drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
3.5 Power and cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.6 Management console network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
3.6.1 Ethernet switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Chapter 4. RAS on IBM System Storage DS8870. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
4.1 Names and terms for the DS8870 storage system . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
4.2 RAS features of DS8870 CEC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
4.2.1 POWER7 Hypervisor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
4.2.2 POWER7 processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
4.2.3 AIX operating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
4.2.4 CEC dual hard disk drive rebuild. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
4.2.5 Cross Cluster communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
4.2.6 Environmental monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
4.2.7 Resource deallocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
4.3 CEC failover and failback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
4.3.1 Dual operational . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4.3.2 Failover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
4.3.3 Failback. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.3.4 NVS and power outages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.4 Data flow in DS8870 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
4.4.1 I/O enclosures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
4.4.2 Host connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
4.4.3 Metadata checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
4.5 RAS on the HMC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
4.5.1 Microcode updates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
4.5.2 Call Home and Remote Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
4.6 RAS on the disk system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
4.6.1 RAID configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
4.6.2 Disk path redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
4.6.3 Predictive Failure Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
4.6.4 Disk scrubbing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
4.6.5 Smart Rebuild . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
4.6.6 RAID 5 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
4.6.7 RAID 6 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
4.6.8 RAID 10 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
4.6.9 Spare creation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
4.7 RAS on the power subsystem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
4.7.1 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
4.7.2 Line power loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
4.7.3 Line power fluctuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
4.7.4 Power control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
4.7.5 Emergency power off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
4.8 RAS and Full Disk Encryption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
4.8.1 Deadlock recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
4.8.2 Dual platform Tivoli Key Lifecycle Manager servers . . . . . . . . . . . . . . . . . . . . . . 102
4.9 Other features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
4.9.1 Internal network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
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IBM System Storage DS8870 Architecture and Implementation
4.9.2 Remote support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
4.9.3 Earthquake resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Chapter 5. Virtualization concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
5.1 Virtualization definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
5.2 The abstraction layers for disk virtualization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
5.2.1 Array sites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
5.2.2 Arrays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
5.2.3 Ranks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
5.2.4 Extent Pools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
5.2.5 Logical volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
5.2.6 Space Efficient volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
5.2.7 Allocation, deletion, and modification of LUNs/CKD volumes. . . . . . . . . . . . . . . 121
5.2.8 Logical subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
5.2.9 Volume access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
5.2.10 Virtualization hierarchy summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
5.3 Benefits of virtualization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
5.4 zDAC - z/OS FICON discovery and Auto-Configuration . . . . . . . . . . . . . . . . . . . . . . . 134
5.5 EAV V2 - Extended Address Volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Chapter 6. IBM System Storage DS8000 Copy Services overview. . . . . . . . . . . . . . . 141
6.1 Copy Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
6.2 FlashCopy and FlashCopy SE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
6.2.1 Basic concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
6.2.2 Benefits and use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
6.2.3 FlashCopy options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
6.2.4 FlashCopy SE-specific options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
6.2.5 Remote Pair FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
6.3 Remote Mirror and Copy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
6.3.1 Metro Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
6.3.2 Global Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
6.3.3 Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
6.3.4 Metro/Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
6.3.5 Multiple Global Mirror sessions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
6.3.6 Thin provisioning enhancements on open environments . . . . . . . . . . . . . . . . . . 159
6.3.7 GM and MGM improvement because of collision avoidance . . . . . . . . . . . . . . . 160
6.3.8 z/OS Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
6.3.9 z/OS Metro/Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
6.3.10 Summary of Remote Mirror and Copy function characteristics. . . . . . . . . . . . . 162
6.3.11 Consistency group considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
6.3.12 GDPS on zOS environments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
6.3.13 Tivoli Storage Productivity Center for Replication functionality. . . . . . . . . . . . . 164
6.4 Resource Groups for copy services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Chapter 7. Architectured for Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
7.1 DS8870 hardware: Performance characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
7.1.1 Vertical growth and scalability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
7.1.2 DS8870 Fibre Channel switched interconnection at the back-end . . . . . . . . . . . 170
7.1.3 Fibre Channel device adapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
7.1.4 Eight-port and four-port host adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
7.2 Software performance: Synergy items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
7.2.1 Synergy on System p . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
7.2.2 Synergy on System z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
7.3 Performance considerations for disk drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Contents
v
7.4 DS8000 superior caching algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
7.4.1 Sequential Adaptive Replacement Cache. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
7.4.2 Adaptive Multi-stream Prefetching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
7.4.3 Intelligent Write Caching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
7.5 Performance considerations for logical configuration . . . . . . . . . . . . . . . . . . . . . . . . . 186
7.5.1 Workload characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
7.5.2 Data placement in the DS8000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
7.5.3 Data placement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
7.6 I/O Priority Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
7.6.1 Performance policies for open systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
7.6.2 Performance policies for System z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
7.7 IBM Easy Tier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
7.7.1 IBM Easy Tier operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
7.7.2 IBM Easy Tier Statement of Direction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
7.8 Performance and sizing considerations for open systems . . . . . . . . . . . . . . . . . . . . . 203
7.8.1 Determining the number of paths to a LUN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
7.8.2 Dynamic I/O load-balancing: SDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
7.8.3 Automatic port queues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
7.8.4 Determining where to attach the host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
7.9 Performance and sizing considerations for System z . . . . . . . . . . . . . . . . . . . . . . . . . 206
7.9.1 Host connections to System z servers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
7.9.2 Parallel Access Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
7.9.3 z/OS Workload Manager: Dynamic PAV tuning . . . . . . . . . . . . . . . . . . . . . . . . . 209
7.9.4 HyperPAV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
7.9.5 PAV in z/VM environments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
7.9.6 Multiple Allegiance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
7.9.7 I/O priority queuing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
7.9.8 Performance considerations on Extended Distance FICON . . . . . . . . . . . . . . . . 217
7.9.9 High Performance FICON for z. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
Part 2. Planning and installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
Chapter 8. DS8870 Physical planning and installation . . . . . . . . . . . . . . . . . . . . . . . . 223
8.1 Considerations before installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
8.1.1 Who should be involved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
8.1.2 What information is required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
8.2 Planning for the physical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
8.2.1 Delivery and staging area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
8.2.2 Floor type and loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
8.2.3 Overhead cabling features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
8.2.4 Room space and service clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
8.2.5 Power requirements and operating environment . . . . . . . . . . . . . . . . . . . . . . . . 232
8.2.6 Host interface and cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234
8.2.7 Host adapter Fibre Channel specifics for open environments . . . . . . . . . . . . . . 235
8.2.8 FICON specifics on zOS environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
8.2.9 Best practice for host adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
8.2.10 WWNN and WWPN determination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
8.3 Network connectivity planning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
8.3.1 Hardware Management Console and network access . . . . . . . . . . . . . . . . . . . . 240
8.3.2 IBM Tivoli Storage Productivity Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
8.3.3 DS command-line interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
8.3.4 Remote support connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
8.3.5 Remote power control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
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IBM System Storage DS8870 Architecture and Implementation
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