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Calculating the size of a COMMDS z/OS DFSMSdfp Storage Administration SC23-6860-01 |
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When you calculate the size of a COMMDS, you have to account for both system and volume information. With SMS 32-name support, the amount of space required for a COMMDS increased. A previously allocated COMMDS might have insufficient space to support the changes. You might need to allocate a new COMMDS prior to activating SMS on a current level system, and you should always review the COMMDS size when migrating from prior DFSMS releases. The following formula helps you determine the size of a COMMDS (VOL = estimated number of DASD volumes in the SMS complex to be managed by SMS): COMMDS size (bytes) =8192 + (588 * VOL) For example, if you have 40 DASD volumes in the SMS complex, you need to allocate 31712 bytes for the COMMDS. |
Copyright IBM Corporation 1990, 2014
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