Analysis Code: 38

Severity: Warning

CFI: 5489

A VV has been discovered that has retained reserved snapshot space but does not have any snapshots associated with it. An inventory of all the VVs is taken looking for those VVs that indicate they have a parent VV, the parent VV’s information is updated to reflect the existence of this child and/or children. We base our discovery on the whether a VV is a parent and the amount of reserved snapshot space greater than 1024 MB.

If a VV is found to have no children but does have reserved snapshot space we then recommend the use of the freespace command to release the unused, reserved space.

Another option is the use of the setvv command, which may be used to eliminate the specified snp_cpg from the VV, this in turn will release the reserved snap space too. If, the parent VV will not or no longer be using snapshots, then setvv command may be the better choice. If an attempt to create a snapshot for the VV in question is made after the snp_cpg designation has been removed, the snapshot creation will fail and would require the VV to be updated to include a snp_cpg designation.

Command syntax:

1. Freespace command: freespace –f <vv_name>

This command fails if the virtual volume is an old-style thin provisioned VV (created on a 2.2.4 release or earlier) or it has snapshots.

2. Setvv command: setvv -snp_cpg "" <vv_name>

If the <snp_cpg> specifier is specified as "", the volume snapshot space is no longer provisioned from a CPG and the existing snapshot space logical disks are removed from the CPG. This is permitted only when the existing snapshot logical disks are exclusively used by the volumes specified in this option.