Hitachi 9900 User Manual

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

Hitachi FlashAccess Software Allows Data Sets to be Permanently Placed in Cache ................................18

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

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

High-speed All Fibre Channel Back-end Design ......................................................................................21

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

New Fibre Channel Disk Drives ..............................................................................................................22

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

Storage Capacity of the Hitachi Freedom Storage Lightning 9900 V Series ..............................................23

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

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

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

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

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

An Overview of High-availability (HA) Computing Software ..................................................................25

Software Products Contribute to High-availability Computing ................................................................25

The Lightning 9900 V Series Has an Advanced Availability Profile Compared to Competitive Products 25

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

Alternate Pathing Middleware Switches the I/O Load in the Event of Path Failure ..........................27

Hitachi Dynamic Link Manager Software Provides Path Failover and Load Balancing ......................27

Host Failover ....................................................................................................................................27

Parallel Database Clustering ..............................................................................................................28

Standard Hot Swap and Redundant Power Supplies ................................................................................28

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

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

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

Internal Switching Overcomes the Limitations of Shared-bus Architectures ............................................31

There Is NO Match for the Performance of the Lightning 9980V System ..............................................31

iv