Hitachi 9900 Series, 9960 Hitachi Data Systems, Read-aheadfor High-performanceSequential Reads

Hitachi Data Systems

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
Chapter 5 – High Performance Back-end Design____________________________________________21
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
Chapter 6 – Capacities and RAID Architecture ____________________________________________23
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
Chapter 7 – Hitachi High-Availability Software Improves Application Service Levels ______________25
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
Chapter 8 – Performance Considerations __________________________________________________31
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

iv