Rename Selecting  Rename  allows you to modify the name of a storage pool. Enter the new name and  click  Rename  in the window. To rename a storage pool by using the CLI, use the  chmdiskgrp  command. Example 6-3  shows how to rename  Pool2  to  StandardStoragePool . If successful, the command returns no  output. The storage pool threshold refers to the percentage of storage capacity that must be in use  for a warning event to be generated. When thin-provisioned volumes are used that  auto-expand (automatically use available extents from the pool), monitor the capacity usage  and get warnings before the pool runs out of free extents so that you can add storage.  Note:  The warning is generated only the first time that the threshold is exceeded by the  used-disk capacity in the storage pool.  The threshold can be modified by selecting  Modify Threshold  and entering the new value.  The default threshold is 80%. Warnings can be disabled by setting the threshold to 0%. The threshold is visible in the pool properties and is indicated with a red bar, as shown in  Figure 6-11. To modify the threshold by using th CLI, use the  chmdiskgrp  command. Thresholds can be  specified with a percentage of the stor age pool size (as with the GUI) and to the exact size.  Example 6-4 shows the warning thres hold that is set to 750 GB for  Pool0 . 220  Implementing the IBM System Storage SAN Volume Controller with IBM Spectrum Virtualize V8.2.1 IBM_2145:ITSO-SV1:superuser>chmdis kgrp -warning 750 -unit gb Pool0 IBM_2145:ITSO-SV1:superuser> Example 6-4 Changing warning threshold  level with CLI Figure 6-11 Pool properties Example 6-3 Using chmdiskgrp to rename storage pool Modifying threshold IBM_2145:ITSO-SV1:superuser>chmdiskgrp -name StandardStoragePool Pool2 IBM_2145:ITSO-SV1:superuser>