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The size of Aggregate capacity available for volume use is not same

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Applies to

ONTAP 9

Issue

The Aggregate capacity available for volume use of a new aggregate and a new raid group created with the same number of disks is different
 

cluster::> aggr create -aggregate aggr02 -diskcount 12 -mirror true -simulate true -node cluster-01
The layout for aggregate "aggr02" on node "cluster-01" would be:
 
First Plex
 
  RAID Group rg0, 6 disks (block checksum, raid_dp)
                                                      Usable Physical
    Position   Disk                      Type           Size     Size
    ---------- ------------------------- ---------- -------- --------
    shared     1.0.13                    SSD-NVM           -        -
    shared     1.2.4                     SSD-NVM           -        -
    shared     1.2.5                     SSD-NVM      3.48TB   3.48TB
    shared     1.2.6                     SSD-NVM      3.48TB   3.48TB
    shared     1.2.7                     SSD-NVM      3.48TB   3.48TB
    shared     1.2.8                     SSD-NVM      3.48TB   3.48TB
 
Second Plex
 
  RAID Group rg0, 6 disks (block checksum, raid_dp)
                                                      Usable Physical
    Position   Disk                      Type           Size     Size
    ---------- ------------------------- ---------- -------- --------
    shared     2.1.23                    SSD-NVM           -        -
    shared     2.2.4                     SSD-NVM           -        -
    shared     2.2.5                     SSD-NVM      3.48TB   3.48TB
    shared     2.2.6                     SSD-NVM      3.48TB   3.48TB
    shared     2.2.7                     SSD-NVM      3.48TB   3.48TB
    shared     2.2.8                     SSD-NVM      3.48TB   3.48TB
 
Aggregate capacity available for volume use would be 11.91TB.


cluster::> aggr add-disks -aggregate aggr01 -diskcount 12 -simulate true
Disks would be added to aggregate "aggr01" on node "cluster-01" in the following manner:
 
First Plex
 
  RAID Group rg1, 6 disks (block checksum, raid_dp)
                                                      Usable Physical
    Position   Disk                      Type           Size     Size
    ---------- ------------------------- ---------- -------- --------
    shared     1.0.13                    SSD-NVM           -        -
    shared     1.2.4                     SSD-NVM           -        -
    shared     1.2.5                     SSD-NVM      3.48TB   3.48TB
    shared     1.2.6                     SSD-NVM      3.48TB   3.48TB
    shared     1.2.7                     SSD-NVM      3.48TB   3.48TB
    shared     1.2.8                     SSD-NVM      3.48TB   3.48TB
 
Second Plex
 
  RAID Group rg1, 6 disks (block checksum, raid_dp)
                                                      Usable Physical
    Position   Disk                      Type           Size     Size
    ---------- ------------------------- ---------- -------- --------
    shared     2.1.23                    SSD-NVM           -        -
    shared     2.2.4                     SSD-NVM           -        -
    shared     2.2.5                     SSD-NVM      3.48TB   3.48TB
    shared     2.2.6                     SSD-NVM      3.48TB   3.48TB
    shared     2.2.7                     SSD-NVM      3.48TB   3.48TB
    shared     2.2.8                     SSD-NVM      3.48TB   3.48TB
 
Aggregate capacity available for volume use would be increased by 12.57TB.

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