Hitachi 9900 Series User Manual

Advanced Cache Algorithms of the Lightning 9900 Series ......................................................................18

Hitachi FlashAccess Allows Datasets to be Permanently Placed in Cache ................................................18

Read-ahead for High-performance Sequential Reads ................................................................................18

The Control Memory Hierarchical Star Network ....................................................................................18

High-Performance Back-end Design ........................................................................................................21

New Fibre Channel Disk Drives ..............................................................................................................21

Maximum Configuration of ACPs and Disks ..........................................................................................22

The Importance of Command Tag Queuing (CTQ) ................................................................................22

Storage Capacity of the Lightning 9900 Series ........................................................................................23

Advantages of the Lightning 9900 Series RAID Hardware ......................................................................23

RAID-1+ ..................................................................................................................................................23

RAID-5 Distributed Parity ......................................................................................................................23

RAID Rebuild Capability ........................................................................................................................23

High-density Disk Drive Assemblies (HDDs) ..........................................................................................24

An Overview of High Availability (HA) Computing Software..................................................................25

Software products contribute to High-Availability Computing ................................................................25

The Lightning 9900 has an Advanced Availability Profile compared to Competitive Products ................25

Open Systems High-Availability Middleware Support ..............................................................................26

1 - Alternate Pathing middleware switches the I/O load in the event of path failure ........................27

2 - Hitachi Dynamic Link Manager provides path failover and load balancing ................................27

3 - Host Failover................................................................................................................................27

4 - Parallel Database Clustering ........................................................................................................28

Standard Hot-swap and Redundant Power Supplies ................................................................................28

Standard Redundant Fans for Cooling......................................................................................................29

Unmatched Competitive Advantage in RAID Choices ............................................................................29

Truly Scalable Performance ......................................................................................................................31

The Advantages of the Lightning 9900 Series Hi-Star Architecture Over a Shared Bus Architecture ........31

Internal Switching Overcomes the Limitations of Shared Bus Architectures ............................................32

Test Results ..............................................................................................................................................32

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