HP XP P9500 Storage - Manual (Page 77)

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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.
Restrictions
Tier relocation cannot be performed in the following cases:
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The used capacity of the pool exceeds the depletion threshold.
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There is no performance monitoring information.
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The pool is blocked.
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A pool-VOL is being deleted.
Tier relocation is not performed on the following pages:
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A new page allocated since the start of the monitoring cycle.
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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 montoring 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.
Collected monitoring information is discarded
The monitor information statuses are valid (VAL), invalid (INV), and calculating (PND) (see “Viewing
monitor and tier relocation information” (page 80) ). MonitoringThe recent monitoring information
that is in valid or calculating status is discarded under any of the following conditions.
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When execution mode is switched from Auto to Manual, or Manual to Auto.
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When a pool-VOL is added (that causes the tier numbering to change (or increase).
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When the Auto LUN operation is performed. Collection of the monitoring information is
discarded only for the corresponding volume.
If collection of monitoring information is canceled, you must collect the monitoring information
again. If using Auto execution mode, or if using scripts while in Manual execution mode, monitoring
information is automatically collected again at the next execution cycle, and then relocation is
performed.
Tier relocation is canceled
While tier relocation is in progress, tier relocation may be canceled under any of the following
conditions. To allow relocation to continue sucessfully, take the necessary actions described in the
table.
Solution* When tier relocation is canceled
Recover from the problem. Cache is blocked.
Recover from the problem. An LDEV is blocked (pool-VOL, THP V-VOL)
Add capacity to the pool. The used capacity of the pool exceeds the pool threshold
during relocation.
Smart Tiers 77