- For IO isolation, a whole disk per volume is recommended
- For capacity isolation, separate partitions per volume is recommended
- Avoid recreating nodes with the same node name while there are still old PVs with that node's affinity specified. Otherwise, the system could think that the new node contains the old PVs.
- For volumes with a filesystem, it's recommended to utilize their UUID (e.g.
the output from
ls -l /dev/disk/by-uuid) both in fstab entries and in the directory name of that mount point. This practice ensures that the wrong local volume is not mistakenly mounted, even if its device path changes (e.g. if /dev/sda1 becomes /dev/sdb1 when a new disk is added). Additionally, this practice will ensure that if another node with the same name is created, that any volumes on that node are unique and not mistaken for a volume on another node with the same name.
- For raw block volumes without a filesystem, use a unique ID as the symlink
name. Depending on your environment, the volume's ID in
/dev/disk/by-id/may contain a unique hardware serial number. Otherwise, a unique ID should be generated. The uniqueness of the symlink name will ensure that if another node with the same name is created, that any volumes on that node are unique and not mistaken for a volume on another node with the same name.