Creating and Administering Volume Sets

This chapter describes how to use the vxvset command to create and administer volume sets in VERITAS Volume Manager (VxVM). Volume sets enable the use of the Multi-Volume Support feature with VERITAS File System (VxFS). It is also possible to use the VERITAS Enterprise Administrator (VEA) to create and administer volumes sets. For more information, see the VEA online help.

For full details of the usage of the vxvset command, see the vxvset(1M) manual page.

Please note the following limitation of volume sets:

• A maximum of 256 volumes may be configured in a volume set.
• Only VERITAS File System is supported on a volume set.
• The first volume (index 0) in a volume set must be larger than the sum of the total volume size divided by 4000, the size of the VxFS intent log, and 1MB.
• Raw I/O from and to a volume set is not supported.
• Volume sets can be used in place of volumes with the following vxsnap operations on instant snapshots: addmir, dis, make, prepare, reattach, refresh, restore, rmmir, split, syncpause, syncresume, syncstart, syncstop, syncwait, and unprepare. The third-mirror break-off usage model for full-sized instant snapshots is supported for volume sets provided that sufficient plexes exist for each volume in the volume set. See Administering Volume Snapshots and Creating Instant Snapshots of Volume Sets for more information.
• A full-sized snapshot of a volume set must itself be a volume set with the same number of volumes and the same volume index numbers as the parent. The corresponding volumes in the parent and snapshot volume sets are also subject to the same restrictions as apply between standalone volumes and their snapshots.