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Does Data ONTAP allow mixing of drive sizes in a RAID group?

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Category:
disk-drives
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hw
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Applies to

  • All FAS systems
  • All AFF systems

Answer

  • Yes. Data ONTAP allows mixing of drives in any RAID group. 
  • Block checksum drives can be added to either a block or zoned checksum RAID groups.
  • Zoned checksum drives can only be added to zoned checksum RAID group

Additional Information

  • While it is possible and legal to mix drives of differing sizes, it might not be advisable to do so. 
  • There will likely be a performance impact once the small disks have become full, as all new writes will go only to the larger drives.
  • It is not possible to add a disk larger than the dParity disk to an existing RAID-DP group and have its full size usable.