HP XP P9500 Storage - Manual (Page 86)

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While the pool-VOL is being deleted, tier relocation is not performed. After the pool-VOL
deletion is completed, tier relocation starts.
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While the frequency distribution graph is being created or the tier range values are being
calculated, the frequency distribution graph is not available. The time required for determining
the tier range values varies depending on the number of THP V-VOLs and total capacity. The
maximum time is about 20 minutes.
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Frequency distribution is unavailable when there is no target page of performance monitor.
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If adding new pages causes capacity in the tier to be insufficient, some pages may not migrate.
These pages are skipped.
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The used capacity of the pool exceeds the warning threshold or the system threshold, whichever
is higher.
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Page to which the tier is not allocated.
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Page that is deleted from the V-VOL while gathering performance monitoring information.
Restrictions
Tier relocation cannot be performed in the following cases:
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Used capacity of the pool reaches up to the threshold which is the warning threshold or the
depletion threshold.
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Pages have no performance monitoring information.
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Pool is blocked.
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Pool-VOL is being deleted.
Tier relocation is not performed on the following pages:
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Pages that are not allocated.
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Zero pages reclaimed during the monitoring cycle.
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Pages that have been allocated to a THP V-VOL that was deleted during the monitoring cycle.
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THP V-VOL page on which relocation is set to Disable.
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THP V-VOLs undergoing a volume migration.
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THP V-VOLs undergoing a Business Copy Quick Restore operation.
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THP V-VOLs undergoing a True Copy initial copy operation.
Collection of monitoring information is cancelled
While monitoring information is being collected, collection of monitoring information is canceled
under the following conditions:
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A pool-VOL is added (as in the case of an increasing the number of tiers) or deleted.
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The Auto LUN operation is performed. Collection of the monitoring information is cancelled
only for the corresponding volumes.
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The Quick Restore operation of Business Copy is performed. Collection of the monitoring
information is cancelled only for the corresponding volumes.
•
The initial copy operation of Continuous Access Synchronous is performed. Collection of the
monitoring information is canceled only for the corresponding volume.
If collection of monitoring information is canceled, subsequent cycles will collect the monitoring
information again. If executing in Auto mode, or if using scripts while in Manual mode, monitoring
information is automatically collected again and relocation is performed.
86 Configuring thin provisioning