Summary of changes
This section describes technical changes made in this edition of the book and in previous editions. This edition might also include minor corrections and editorial changes that are not identified.
Summary of Changes for Implementing IBM FlashSystem 900
for SG24-8271-01, as created or updated on November 18, 2016.
for SG24-8271-01, as created or updated on November 18, 2016.
November 2016, Second Edition
The second edition includes information about attaching the IBM FlashSystem 900 to IBM i. Chapter 5, “IBM FlashSystem 900 client host attachment and implementation” on page 101 was updated with considerations that are specific to IBM i. The following topics that are relative to IBM i and IBM FlashSystem 900 are new to this chapter:
•Attachment methods
•Zoning rules
•Hardware and software requirements
•Configuration and performance considerations
May 2015, First Edition
This first edition reflects the information that is implemented for the initial release of IBM FlashSystem 900, which is based on FlashSystem 840 release 1.3.
The changes described are implemented since IBM FlashSystem 840 release 1.3, which is document in Implementing IBM FlashSystem 840, SG24-8189.
This edition might include minor corrections and editorial changes that are not identified.
New information
This edition includes the following new information.
IBM FlashCore technology
At the heart of FlashSystem 900 lies IBM FlashCore technology, which consists of the following three key elements:
•Hardware-accelerated architecture engineered for flash, with hardware only data path including Hardware RAID, Non-blocking Crossbar Switch, Hardware Only Data Path, Single Box Highly Available Architecture, Concurrent Code Load and Concurrent Maintenance
•IBM MicroLatency® modules designed for low latency, high density, and reliability with health binning and heat segregation which continually assesses health by monitoring several key parameters and proactively performing in-flight adjustments.
•IBM Advanced Flash Management improves flash endurance 9x over standard implementations with IBM engineered ECC, advanced wear leveling, and proprietary garbage collection, relocation, and block picking algorithms. See “Terminology” on page 19.
IBM MicroLatency module granularity
IBM has enhanced the flexibility of the IBM FlashSystem 900 with new, more granular capacity offerings starting as low as a 2.4 TB RAID 5 configuration, providing an attractive entry point so that you can start with smaller, application-specific flash deployments and scale up to Tier 1 disk replacement as business needs grow.
This book includes the following new information based on Release 2.0:
•IBM MicroLatency modules incorporating IBM enhanced multi-level cell (MLC) chips and IBM FlashCore technology
•Up to 12 IBM MicroLatency modules in increments of 4, 6, 8, 10, or 12 for the 1.2 TB module and 6, 8, 10, or 12 for the 2.9 TB and 5.7 TB modules
•Capacity points:
– RAID 5: 2.2, 4.5, 6.8, 9.1, 11.4, 11.4, 17.1, 22.8, 28.5, 22.8, 34.2, 45.6, and 57 TB
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Note: IBM FlashSystem 900 only supports a RAID 5 configuration.
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FlashSystem 900 GUI management
Additional FlashSystem 900 management software improvements make system management and performance health monitoring even more effective in the already-intuitive FlashSystem GUI. Additional features include these:
•Selectable front and rear views of the machine through a rotate icon, with hot spot highlight displays for each of the major components status.
•A tri-pane indicator at the bottom center on the main GUI, displaying the values of bandwidth, IOPS, and latency.
•New function (Modify Reserve Capacity) for changing the amount of space reserved for LUNs. Reserving less space for LUNs allows the FlashSystem 900 to allocate more space for housekeeping operations, and as a result improves the overall machine performance.
Retained Features
The following features are included with FlashSystem 900 as of support of FlashSystem 840 release 1.3.
1300 watt power supply
The 1300 watt power supply for high-line voltage is now standard in IBM FlashSystem 900. This provides a high-power output supply, to run at maximum performance for longer durations during power supply servicing, resulting in more predictable performance under unexpected failure conditions.
Encryption
FlashSystem 900 has retained these new encryption functions, which are performed from the FlashSystem GUI:
•Hot Encryption Activation: Adding an encryption license to a previously initialized system
•Encryption Rekey: Changing the encryption key on a previously initialized system
Battery reconditioning
IBM FlashSystem 900 incorporates the battery reconditioning feature to calibrate the gauge that reports the amount of charge on the batteries. This ensures that the batteries are kept at the optimal level to support the IBM FlashSystem 900, and conduct a controlled and orderly shutdown, in the event of an external power outage.
Changed information
This revision also includes additional feedback from the field including Removal of RAID 0 support. RAID 0 configuration is no longer supported on the IBM FlashSystem 900. Only RAID 5 configurations are supported.
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