Knowledgebase: Pure
Backup repository and backup volumes
Posted by Marijan Kozic, Last modified by Marijan Kozic on 19 June 2019 19:36
Backup repository organisation
Archiware Pure Backup repository consists of one or more Backup Volumes. Each Backup Volume is a mount point with an existing file system. Any file system supported by the host OS is acceptable so you have great freedom in choosing the best option for your hardware and software configuration.

One of the Backup volumes is configured as the Primary backup disk and all newly discovered VMs will be assigned to this Backup volume. Note that once a VM is assigned to a Backup volume, its backup data will always be stored there. Assigning a different Backup volume as a Primary backup disk will have effect only on the VMs discovered and added to Archiware Pure from that moment onwards.

Each Backup volume can independently configured with a different Parallelism setting, determining the maximum number of backup and verification jobs that can be executed in parallel using this Backup volume.

Increasing backup storage
One obvious method of increasing storage would be to externally increase the capacity of the mount point corresponding to a given Backup volume.

Another option is to add more Backup volumes in App Configuration -> Repository page in Pure GUI.

Because of the way the VMs are permanently assigned to a Backup volume, simply adding more volumes may not immediately resolve low storage situation. For this, some of the VMs should be reassigned or migrated to newly added Backup volume.

VM migration feature is planned for future Archiware Pure releases. Until such time, there is a known workaround to manually move the existing VMs.
WARNING: While this will have the desired effect of re-assigning the VM to a different volume, in reality you are deleting a VM and creating it again. You will lose all existing backups for that VM, as well as any backup scheduling and tagging information. But if your current volume is getting full and you must make some space or if the VMs you want to move have no existing backups yet, this workaround could work for you.

Please execute the following steps:
1. add a new Backup volume
2. mark it as the Primary backup disk
3. delete (remove from Pure repository) those VMs that you wish to have assigned to the new Backup volume
4. on next VM list refresh, Pure will re-discover those VMs in vSphere inventory and will add them to Pure inventory again. Except that now they will be assigned to the new Backup volume
5. restart Pure to delete the old backup data from the old Backup volume

Manually migrating backup volumes
If you need to completely migrate a backup volume to another empty location (e.g. to a larger storage volume), this can be performed manually while Archiware Pure is NOT running.

NOTE: The following procedure expects that the target location is an empty path and not an already existing Backup volume. Moving data manually into an existing Backup volume is not officially supported - it should work for now but it might fail spectacularly in the future if the two locations use different versions of Pure backup volume configuration.

To migrate all your backup data manually, please follow these  steps:
1. stop Archiware Pure
2. manually move the content of your Backup volume to the desired empty path (e.g. mv /path/to/old/backup/volume/* /path/to/empty/space/for/new/volume/)
3. find the symlink to the old backup volume within <pure home folder>/pools and remember its name (e.g. ls -la /usr/local/pure/vmsn/pools)
4. change the symlink to point to the new location (e.g. ln -sfn /path/to/empty/space/for/new/volume/ /usr/local/pure/vmsn/pools/linkname)
5. start Archiware Pure
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