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Optimizing Volumes

Volumes can be optimized by Compatible FlashCopy if you use the DEFRAG command of the

DFSMSdss utility with the FASTREPLICATION option. See the IBM FlashCopy manual for details of

the option.

CAUTION: The DEFRAG command may generate an error because the number of relationships

per volume exceeds the maximum when all the following conditions are met.

• The parity group including the volume is overloaded when accessed too many times.

• The DEFRAG command is executed with FASTREPLICATION(REQUIRED).

To avoid an error, avoid using the FASTREPLICATION option or specify

FASTREPLICATION(PREFERRED). If you specify FASTREPLICATION(REQUIRED), you must reduce

workloads on the parity group.

Optimizing Volumes 35

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Hp XP7 Storage Manual do Utilizador Página 35