November 2001
Intermediate to advanced
158 pages
5h 10m
English
Content preview from IBM ESS and IBM DB2 UDB Working Together
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16 IBM ESS and IBM DB2 UDB Working Together
2.1.4 8-packs
An 8-pack is a physical collection of 8 disk drives, and disks are added to enterprise storage
systems in multiples of 8-packs.
2.1.5 Arrays or ranks
An ESS array (also called a rank) is a collection of disks, with data striped across the disks for
performance, and parity information stored to protect user data from disk failures. ESS
configures its arrays using state-of-the-art RAID5 technology.
ESS provides RAID-5 arrays in sizes of either seven or eight disks. In addition, hot spare
disks are reserved in case of disk failure. A RAID5 array is an array configured for high
availability ...
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