HP XP Racks User Manual
Page 147
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Creating THP V-VOLs.
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Increasing THP V-VOL capacity.
While the pool capacity is being decreased, if maintenance of cache memory is performed, if the
cache memory fails, or if the I/O load to the THP V-VOL related to the pool is high, decreasing
the pool capacity process might fail. In this case, check the Tasks window to determine whether
processing has abnormally ended.
If the processing has ended abnormally, restore the cache memory, and then try decreasing the
pool capacity again.
NOTE:
You cannot perform the following operations on a pool while the pool volume capacity
is in the process of shrinking. Wait until shrinking completes or stop the shrinking process.
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Expand Pool
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Shrink Pools
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Edit Pools
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Restore Pools
If you delete the pool-VOL with the pool’s system area, the used capacity and the management
area will move to other pool volumes. If you delete the pool-VOL with system area, a different
system area pool-VOL will be assigned automatically according to the priority shown in the following
table. A pool must include one or more pool-VOLs.
Data drive type
Priority
SAS7.2K
1
SAS10K
2
SAS15K
3
SSD
4
External volume
5
If multiple pool-VOLs of the same data drive type exist, the priority of each is determined by internal
index of the storage system.
If pool capacity is decreased soon after creating a pool or adding a pool-VOL, processing may
take a while to complete.
Notes on using Thin Provisioning
You cannot delete a pool-VOL under these conditions.
•
If the pool-VOL is deleted, the used capacity of the pool-VOL exceeds the pool threshold.
•
If the pool-VOL is deleted, the subscription rate of the total V-VOL capacity including the control
information exceeds the subscription limit. For details about the formula used to calculate the
required pages for one DP-VOL including the control information, see
.
•
If the pool-VOL with system area is deleted, more than 4.2 GB of free space is necessary in
the pool.
Managing pools and THP V-VOLs
147