Hitachi 9900 manual Hitachi Data Systems, Read-aheadfor High-performanceSequential Reads

Hitachi Data Systems

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

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