Creating a Log File for an Existing Volume

Log subdisks are used to store the dirty region log of a volume that has DRL enabled. A volume with DRL has at least one log subdisk; multiple log subdisks can be used to mirror the dirty region log. Each log subdisk is associated with one of the volume's plexes. Only one log subdisk can exist per plex. If the plex contains only a log subdisk and no data subdisks, that plex can be referred to as a log plex. The log subdisk can also be associated with a regular plex containing data subdisks, in which case the log subdisk risks becoming unavailable in the event that the plex must be detached due to the failure of one of its data subdisks.

Use the graphical user interface or the command-line utility vxassist(1M) to create a log for an existing volume.