Hitachi STORAGE 9900 - Manual (Page 6)

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
Chapter 5 – High-performance Back-end Design ____________________________________________21
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
Chapter 6 – Capacities and RAID Architecture ____________________________________________23
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
Chapter 7 – Hitachi Freedom Storage Lightning 9900 V Series Availability Is Highest in the Industry 25
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
Chapter 8 – Unmatched Performance and Scalability ________________________________________31
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
Hitachi Data Sy s t e m s
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