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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Chapter 3. Configuration for performance and manageability 39
3.3.2 Logical volume mirroring
AIX logical volumes can also be mirrored across several physical volumes. For the most part,
this is redundant with the RAID functions of ESS. However, you may consider its use in
special circumstances, such as facilitating movement of data to ESS when migrating from
other storage devices.
3.4 Other data placement considerations
Other factors that can be taken into account include the following.
Size of RAID arrays
ESS arrays come in two sizes: 6+P and 7+P, depending on the number of disks in the system.
The performance-attentive among you might have realized that a 7+p array should perform
better than a 6+p array. For writes and random I/O, you may see ...
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