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Customizing the size of your RAID groups

You can customize the size of your RAID groups based on your requirements for data availability, performance, and disk utilization.

About this task

For standard aggregates, you change the size of RAID groups on a per-aggregate basis. For Flash Pool aggregates, you can change the RAID group size for the SSD RAID groups and the HDD RAID groups independently. You cannot change the size of individual RAID groups.

The following list outlines some facts about changing the RAID group size:
  • If you increase the RAID group size, more disks or array LUNs will be added to the most recently created RAID group until it reaches the new size.
  • All other existing RAID groups in that aggregate remain the same size, unless you explicitly add disks to them.
  • You cannot decrease the size of already created RAID groups.
  • The new size applies to all subsequently created RAID groups in that aggregate (or, in the case of a Flash Pool, all subsequently created RAID groups for the affected RAID group type-- SSD or HDD).

Step

  1. Use the appropriate command as outlined in the following table:
    If you want to... Enter the following command...
    Change the RAID group size for the SSD RAID groups of a Flash Pool aggregate aggr options aggr_name cache_raidsize size
    Change the size of any other RAID groups aggr options aggr_name raidsize size

Examples

The following command changes the maximum RAID group size of the aggregate n1_a4 to 20 disks or array LUNs: aggr options n1_a4 raidsize 20

The following command changes the maximum RAID group size of the SSD cache RAID groups of the Flash Pool aggregate n1_cache_a2 to 24: aggr options n1_cache_a2 cache_raidsize 24