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Dell PowerStore Configuring Volumes

Performance policies

A performance policy specifies I/O performance requirements for PowerStore storage resources. PowerStore provides three predefined performance policies:

  • High
  • Medium (default)
  • Low

PowerStore has share-based QoS. Share-based QoS means when there is contention at system level, a volume with a high-performance policy handles more IOPS than a volume with a medium-performance policy. Further, a volume with a medium-performance policy handles more IOPS than one with a low-performance policy.

It is recommended that you associate the high-performance policy with critical applications only. Reserving a high-performance policy for critical applications ensures that those critical applications are not competing for I/O against less-critical applications.

Performance policies for PowerStore T model storage resources

You can assign performance policies to volumes and thin clones when you provision them or modify their configuration.

If you do not explicitly configure a performance policy for a resource, the resource is associated with a Medium performance policy.

Performance policies for PowerStore X model storage resources

The system assigns performance policies to VM volume groups and individual VMs based on their capability profiles in VMware vCenter. It correlates the following VMware performance-based capability profiles to performance policies:

Table 1. Performance policies
VMware capability profile PowerStore performance policy
High-Priority performance High
Medium-Priority performance Medium
Low-Priority performance Low

Use vCenter to change the performance policy for VM volume groups and individual VMs.

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