Dell PowerVault ME4 Series Storage System CLI Guide

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set pool


Description	Sets parameters for a virtual pool. 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. When the low or middle threshold is exceeded, event 462 is logged with Informational severity. If the high threshold is exceeded and the pool is not overcommitted, event 462 is logged with Informational severity. If the high threshold is exceeded and the pool is overcommitted, event 462 is logged with Warning severity. If the pool capacity threshold is reached, event 462 is logged with Error severity. When pool usage falls back below any threshold, event 463 is logged with Informational severity. NOTE:If the pool size is small (approximately 500 GB) and/or the middle threshold is relatively high, the high threshold may not guarantee 200 GB of reserved space in the pool. The controller will not automatically adjust the low and middle thresholds in such cases. You can also enable the overcommit feature, which controls whether storage-pool capacity may exceed the physical capacity of disks in the system. If you try to disable overcommit and the total space allocated to thin-provisioned volumes exceeds the physical capacity of their pool, an error will state that there is insufficient free disk space to complete the operation and overcommit will remain enabled. When the overcommit feature is disabled, the host does not lose read or write access to the pool volumes when the pool reaches or exceeds the high threshold value. When the overcommit feature is enabled, the storage system sends the data protect sense key Add, Sense: Space allocation failed write protect to the host when the pool reaches or exceeds the high threshold value. If the host is rebooted after the pool reaches or exceeds the high threshold value, the host loses read and write access to the pool volumes. The only way to regain read and write access to the pool volumes is to add more storage to the pool. 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. To check if the pool is overcommitted, view the over-committed and over-committed-numeric properties shown by the show pools command in API mode. You can also view the Pool Overcommitted value in the PowerVault Manager, as described in help for the Pools topic.
Minimum role	manage
Syntax	set pool [low-threshold `#`%] [middle-threshold `#`%] [overcommit enabled\|disabled\|on\|off] `pool`
Parameters	[low-threshold `#`%] Optional. Sets the low threshold for page allocation as a percentage of pool capacity. This value must be less than the middle-threshold value. The default low-threshold value is 50%. [middle-threshold `#`%] Optional. Sets the middle threshold for page allocation as a percentage of pool capacity. This value must be between the low-threshold value and the high-threshold value. The default middle-threshold value is 75%. [overcommit enabled\|disabled\|on\|off]Optional. enabled or on: The allocated size of the volumes can exceed the physical capacity of the pool. When stored data approaches the limit of physical capacity, the administrator can add more enclosures to the system. This is the default. disabled or off: The allocated size of the volumes cannot exceed the physical capacity of the pool. NOTE:If you try to disable overcommit and the total space allocated to thin-provisioned volumes exceeds the physical capacity of their pool, an error will say that there is insufficient free disk space to complete the operation and overcommit will remain enabled. `pool` The name of the storage pool for which to change settings.
Examples	For pool A, set the low threshold to 30%. # set pool low-threshold 30% A For pool B, disable overcommit. # set pool overcommit off B
See also	delete pools show pools