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What is the total number of disks that gets added when expanding an aggregate

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cloud-volumes-ontap-cvo
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Applies to

  • BlueXP
  • Cloud Volumes ONTAP (CVO)
  • Amazon Web Services (AWS)
  • Google Cloud Platform (GCP)

Answer

For every disk that gets added to expand the active file system of an aggregate, a disk of the same size is added to the partner node for synchronous mirroring. Let us take the below scenario for example: 
  • The BlueXP user tries to add two 8 TiB GP2 disks to an aggregate. BlueXP shows the below notice when the user tries to purchase the disks:

aggr disk 1.png

  • When the aggregate gets expanded, the number of disks mentioned as 4, but the provisioned size only accounts to that of 2 disks (excluding reserved space for aggregate metadata and performance):

aggr info.png

  • The reason behind the above reflection is, the total disk count also takes into account the disks that are added to the partner node for synchronous mirroring.

 

 

Additional Information

  • It is important to note that, though 32 TiB of capacity is added to the system (accounted by 4 disks) and the cloud provider charges for all 4 disks, only 16 TiB counts against the NetApp license limit.
  • Storage Limits in AWS
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