Administrator Guide

Add dedicated spares
1. In the Pools topic, select the linear pool for the disk group that you are modifying in the pools table. Then, select the disk group in the
Related Disk Groups table.
2. Select Action > Manage Spares. The Manage Spares panel opens.
3. Check the Assign dedicated spares to the disk group box, then select the disk group in which you want the dedicated spare to
reside.
4. In the Add New Spares section, click on available disks to select them.
5. Click Add Spares. The system updates the dedicated spares and a confirmation panel appears.
6. To close the confirmation panel, click OK.
Create a volume
You can add volumes to virtual pools and linear disk groups. Use the Create Virtual Volumes panel or the Create Linear Volumes panel to
create volumes. You can access the panels from either the Pools and Volumes topics.
1. In the Pools topic, select a pool in the pools table.
NOTE: To see more information about a pool, hover the cursor over the pool in the table. See Viewing pools for more
details about the Pool Information panel that appears.
2. Select a disk group in the Related Disk Groups table.
3. Select Action > Create Volumes.
The Create Virtual Volumes or Create Linear Volumes panel opens, depending on the type of disk group that you selected.
For more information about creating virtual volumes, see Create a virtual volume. For more information about creating linear volumes,
see Create a linear volume.
Changing pool settings
Each virtual pool has three thresholds for page allocation as a percentage of pool capacity. You can set the low and middle thresholds. The
high threshold is automatically calculated based on the available capacity of the pool minus 200 GB of reserved space.
NOTE:
If the pool size is 500 GB or smaller, or the middle threshold is relatively high or both, the high threshold may not
guarantee 200 GB of reserved space in the pool. The controller cannot automatically adjust the low and middle
thresholds in such cases.
You can view and change settings that govern the operation of each virtual pool:
• Low Threshold: When this percentage of virtual pool capacity has been used, informational event 462 is generated to notify the
administrator. This value must be less than the Mid Threshold value. The default is 50 percent.
• Mid Threshold: When this percentage of virtual pool capacity has been used, event 462 is generated to notify the administrator to
add capacity to the pool. This value must be between the Low Threshold and High Threshold values. The default is 75 percent. If the
pool is not overcommitted, the event has an Informational severity. If the pool is overcommitted, the event has a Warning severity.
• High Threshold: When this percentage of virtual pool capacity has been used, event 462 is generated to alert the administrator to
add capacity to the pool. This value is automatically calculated based on the available capacity of the pool minus 200 GB of reserved
space. If the pool is not overcommitted, the event has an Informational severity. If the pool is overcommitted, the event has Warning
severity and the system uses write-through cache mode until virtual pool usage drops back below this threshold.
• Enable overcommitment of pools?: This check box controls whether the allocated size of the volumes can exceed the physical
capacity of the pool.
NOTE: The above pool settings apply only to virtual pools. They do not affect linear pools.
NOTE: If your system has a replication set, the pool might be unexpectedly overcommitted because of the size of the
internal snapshots of the replication set. If the pool is overcommitted and has exceeded its high threshold, its health
shows as degraded in the Pools topic. If the pool is overcommitted and has exceeded its high threshold, its health shows
as degraded in the Pools topic. If you try to disable overcommitment and the total space that is allocated to thin-
provisioned volumes exceeds the physical capacity of their pool, an error states that there is insufficient free disk space
to complete the operation and overcommitment remains enabled.
To check if the pool is overcommitted, hover the cursor over the pool in the pools table to display the Pool Information panel . If the Pool
Overcommitted value is True, the pool is overcommitted. If the Pool Overcommitted value is False, the pool is not overcommitted.
Working in the Pools topic
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