Monitoring total THP V-VOL subscription for a pool
You can configure the Subscription Limit of total THP V-VOL capacity to pool capacity. This prevents
a new THP V-VOL capacity that exceeds the configured subscription limit from being allocated and
is associated with the pool. If you specify more than 100% as the Subscription Limit or the
subscription limit is not set, you must monitor the free capacity of the pool because it is possible
that writes to the THP V-VOLs may exceed pool capacity. For details about the Subscription Limit,
see “Create Pools window” (page 314).
The used value displayed on the cell for Current in the Subscription (%) is truncated after the decimal
point of the calculated value. Therefore, the actual percentage of THP V-VOL assigned to the pool
may be larger than the value displayed on the window. If you create a new THP V-VOL of the
same size as the existing THP V-VOL, the larger size of capacity which is displayed on the Current
cell is necessary.
For example, if 3 GB V-VOL is related to an 11.89 GB pool, the capacity (%) is calculated as
follows:
(( ceil(3,072 (MB) / 3,145,548 (MB)) * 4 (Pages) * 42 (MB)) +
3,072 (MB)) / 12,175.36 (MB)) * 100 = 26.61....(%)
In this case, 26 (%) is displayed on the cell for Current in the Subscription (%). If you create a new
V-VOL of the same size as the existing V-VOL, 27 (%) or more remaining capacity is necessary.
Changing pool thresholds
The Storage Administrator (Provisioning) role is required to perform this task.
1. In the Remote Web Console main window, in the Storage Systems tree, select Pool.
The pool name appears below Pool.
2. From the Pools table, select the pool with the threshold you want to change.
3. Click More Actions, then select Edit Pools.
4. In the Edit Pools window, check Warning Threshold or Depletion Threshold.
5. Type the threshold values in the text box.
The threshold value can be within the range of values indicated below the text box. The
Depletion Threshold value can be equal to or greater than the Warning Threshold.
6. Click Finish.
140 Configuring thin provisioning
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