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Dell Unity™ Family Unisphere® Command Line Interface User Guide

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Configure custom pools

Pools are the groups of drives on which you create storage resources. Configure pools based on the type of storage resource and usage that will be associated with the pool, such as file system storage optimized for database usage. The storage characteristics differ according to the following:

Type of drive used to provide the storage.
(dual-SP virtual deployments only) RAID level implemented for the storage.

NOTE:Before you create storage resources, you must configure at least one pool.

The following table lists the attributes for pools:

Table 1. Custom pool attributes
Attribute	Description
ID	ID of the pool.
Name	Name of the pool.
Type	Pool type. Valid values are: Dynamic Traditional
Description	Brief description of the pool.
Total space	Total storage capacity of the pool.
Current allocation	Amount of storage in the pool allocated to storage resources.
Preallocated space	Amount of storage space reserved in the pool by storage resources for future needs to make writes more efficient. The pool may be able to reclaim some of this space if total pool space is running low. This value equals the sum of the sizePreallocated values of each storage resource in the pool.
Remaining space	Amount of storage in the pool not allocated to storage resources.
Subscription	For thin provisioning, the total storage space subscribed to the pool. All pools support both standard and thin provisioned storage resources. For standard storage resources, the entire requested size is allocated from the pool when the resource is created, for thin provisioned storage resources only incremental portions of the size are allocated based on usage. Because thin provisioned storage resources can subscribe to more storage than is actually allocated to them, pools can be over provisioned to support more storage capacity than they actually possess. NOTE: The system automatically generates an alert when the total pool usage reaches 85% of the pool's physical capacity. -alertThreshold specifies the alert threshold value.
Subscription percent	For thin provisioning, the percentage of the total space in the pool that is subscription storage space.
Alert threshold	Threshold for the system to send an alert when hosts have consumed a specific percentage of the subscription space. Value range is 50 to 85.
Drives	List of the types of drives on the system, including the number of drives of each type, in the pool. If FAST VP is installed, you can mix different types of drives to make a tiered pool. However, SAS Flash 4 drives must be used in a homogeneous pool.
Number of drives	Total number of drives in the pool.
Number of unused drives	Number of drives in the pool that are not being used.
RAID level (physical deployments only)	RAID level of the drives in the pool.
Stripe length (physical deployments only)	Number of drives the data is striped across.
Rebalancing	Indicates whether a pool rebalancing is in progress. Valid values are: yes no
Rebalancing progress	Indicates the progress of the pool rebalancing as a percentage.
System defined pool	Indication of whether the system configured the pool automatically. Valid values are: yes no
Health state	Health state of the pool. The health state code appears in parentheses. Valid values are: Unknown (0)—Health is unknown. OK (5)—Operating normally. OK BUT (7)—Pool has exceeded its user-specified threshold or the system specified threshold of 85%. Degraded/Warning (10)—Pool is operating, but degraded due to one or more of the following: Pool has exceeded the user-specified threshold. Pool is nearing capacity. Pool is almost full. Pool performance has degraded. Major failure (20)—Dirty cache has made the pool unavailable. Critical failure (25)—Pool is full. To avoid data loss, add more storage to the pool, or create more pools. Non-recoverable error (30)—Two or more drives in the pool have failed, possibly resulting in data loss.
Health details	Additional health information. See Appendix A, Reference, for health information details.
FAST Cache enabled (physical deployments only)	Indicates whether FAST Cache is enabled on the pool. Valid values are: yes no
Non-base size used	Quantity of storage used for thin clone and snapshot data.
Auto-delete state	Indicates the state of an auto-delete operation on the pool. Valid values are: Idle Running Could not reach LWM Could not reach HWM NOTE: If the auto-delete operation cannot satisfy the high water mark, and there are snapshots in the pool, the auto-delete operation sets the auto-delete state for that watermark to Could not reach HWM, and generates an alert. Failed
Auto-delete paused	Indicates whether an auto-delete operation is paused. Valid values are: yes no
Auto-delete pool full threshold enabled	Indicates whether the system will check the pool full high water mark for auto-delete. Valid values are: yes no
Auto-delete pool full high water mark	The pool full high watermark on the pool.
Auto-delete pool full low water mark	The pool full low watermark on the pool.
Auto-delete snapshot space used threshold enabled	Indicates whether the system will check the snapshot space used high water mark for auto-delete. Valid values are: yes no
Auto-delete snapshot space used high water mark	High watermark for snapshot space used on the pool.
Auto-delete snapshot space used low water mark	Low watermark for snapshot space used on the pool.
Data Reduction space saved (physical deployments only)	Storage size saved on the pool by using data reduction. NOTE:Data reduction is available for thin LUNs and thin file systems. The thin file systems must be created on Unity systems running version 4.2.x or later.
Data Reduction percent (physical deployments only)	Storage percentage saved on the pool by using data reduction. NOTE:Data reduction is available for thin LUNs and thin file systems. The thin file systems must be created on Unity systems running version 4.2.x or later.
Data Reduction ratio (physical deployments only)	Ratio between data without data reduction and data after data reduction savings. NOTE:Data reduction is available for thin LUNs and thin file systems. The thin file systems must be created on Unity systems running version 4.2.x or later.
All flash pool	Indicates whether the pool contains only Flash drives. Valid values are: yes no