Dell PowerStore 5000T EMC PowerStore Configuring Volumes - Page 18

6 Performance policies A performance policy specifies I/O performance requirements for PowerStore storage resources. PowerStore provides three pre-defined 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 services more IOPS than a volume with a medium-performance policy. Further, a volume with a medium-performance policy services 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: VMware capability profile High-Priority performance Medium-Priority performance Low-Priority performance PowerStore performance policy High Medium Low Use vCenter to change the performance policy for VM volume groups and individual VMs. Topics: • Change a performance policy for a volume Change a performance policy for a volume Steps 1. Under Storage, select Volumes. 2. Click on the name of the volume you want to change. 3. On the Performance card, click the current performance policy name. 4. Select the performance policy on the slide-out panel. 18 Performance policies