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Disk count of first plex show different number with second plex when  simulate adding disks to an existing  mirrored aggregate

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Applies to

ONTAP 9.x

Issue

When performing the command "storage aggregate add-disks -aggregate -simulate" to add disks to an existing mirrored aggregate, disk count of the first plex show different numbers with the second plex.

Example:

The below command is adding 11 disks to an existing aggregate "aggr_ssd" :

Cluster::> storage aggregate add-disks -aggregate aggr_ssd -disklist 1.31.12,1.31.13,1.31.14,1.31.15,1.31.16,1.31.17,1.31.18,1.31.19,1.31.20,1.31.21,1.31.22 -raidgroup rg0 -mirror-disklist 4.21.12,4.21.13,4.21.14,4.21.15,4.21.16,4.21.17,4.21.18,4.21.19,4.21.20,4.21.21,4.21.22 -simulate

Disks would be added to aggregate "aggr_ssd" on node "Cluster_node1" in the following manner:

First Plex

RAID Group rg0, 22 disks (block checksum, raid_dp)
Usable Physical
Position Disk Type Size Size
---------- ------------------------- ---------- -------- --------
data 1.31.12 SSD 3.49TB 3.49TB
data 1.31.13 SSD 3.49TB 3.49TB
data 1.31.14 SSD 3.49TB 3.49TB
data 1.31.15 SSD 3.49TB 3.49TB
data 1.31.16 SSD 3.49TB 3.49TB
data 1.31.17 SSD 3.49TB 3.49TB
data 1.31.18 SSD 3.49TB 3.49TB
data 1.31.19 SSD 3.49TB 3.49TB
data 1.31.20 SSD 3.49TB 3.49TB
data 1.31.21 SSD 3.49TB 3.49TB
data 1.31.22 SSD 3.49TB 3.49TB

Second Plex

RAID Group rg0, 11 disks (block checksum, raid_dp)
Usable Physical
Position Disk Type Size Size
---------- ------------------------- ---------- -------- --------
data 4.21.12 SSD 3.49TB 3.49TB
data 4.21.13 SSD 3.49TB 3.49TB
data 4.21.14 SSD 3.49TB 3.49TB
data 4.21.15 SSD 3.49TB 3.49TB
data 4.21.16 SSD 3.49TB 3.49TB
data 4.21.17 SSD 3.49TB 3.49TB
data 4.21.18 SSD 3.49TB 3.49TB
data 4.21.19 SSD 3.49TB 3.49TB
data 4.21.20 SSD 3.49TB 3.49TB
data 4.21.21 SSD 3.49TB 3.49TB
data 4.21.22 SSD 3.49TB 3.49TB

Aggregate capacity available for volume use would be increased by 32.85TB.

 

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