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How to change the RAID group size

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Applies to

ONTAP 9

Description

Maximum and default RAID group sizes vary according to the NetApp platform and type of RAID group protection provided. Refer to  hwu.netapp.com

How RAID groups work
  • A RAID group consists of one or more data disks or array LUNs, across which client data is striped and stored, and up to two parity disks, depending on the RAID level of the aggregate that contains the RAID group.
  • RAID-DP uses two parity disks to ensure data recoverability even if two disks within the RAID group fail.
  • RAID4 uses one parity disk to ensure data recoverability if one disk within the RAID group fails.
  • RAID0 does not use any parity disks; it does not provide data recoverability if any disks within the RAID group fail.
Customizing the size of your RAID groups

For standard aggregates, change the size of RAID groups on a per-aggregate basis. For Flash Pool aggregates, change the RAID group size for the SSD RAID groups and the HDD RAID groups independently.

The following list outlines some facts about changing the RAID group size:

  • By default, if the number of disks or array LUNs in the most recently created RAID group is less than the new RAID group size, 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 can never cause a RAID group to become larger than the current maximum RAID group size for the aggregate.
  • You cannot decrease the size of already created RAID groups.
  • The new size applies to all RAID groups in that aggregate (or, in the case of a Flash Pool aggregate, all RAID groups for the affected RAID group type—SSD or HDD).

 

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