File systems backed up using GPFS 3.2 or earlier versions of mmbackup
GPFS™ 3.2 and earlier versions of the mmbackup command automatically created a temporary snapshot named .mmbuSnapshot of the specified file system, and backed up this snapshot to the IBM Spectrum Protect™ server. Accordingly, the files backed up by the command were stored in IBM Spectrum Protect using the /Device/.snapshots/.mmbuSnapshot directory path in the remote data store.
The GPFS 3.3 through GPFS 3.5.0.11 versions of the mmbackup command will preserve this type of processing for incremental backups until a new full backup is performed. Once a full backup is performed, mmbackup will store the files in IBM Spectrum Protect under their usual GPFS root directory path name; all files under /Device/.snapshots/.mmbuSnapshot will be marked for expiration. Until the transition to using the usual GPFS root directory path name in IBM Spectrum Protect is complete, no backups can be taken from a snapshot, other than the mmbackup temporary snapshot called .mmbuSnapshot.
The transition to using the usual GPFS root directory path name format, instead of the /Device/.snapshots/.mmbuSnapshot path name format permits mmbackup to perform a backup using any user-specified snapshot, or the live file system interchangeably.
Certain features, such as backing up from an arbitrary snapshot, cannot be used until a full backup is performed with the GPFS 3.3 or later version of the mmbackup command.