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About volume sets

Volume sets enable the use of the Multi-Volume Support and Dynamic Storage Tiering (DST) features 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.

Veritas Volume Manager (VxVM) provides the vxvset command to create and administer volume sets.

See the vxvset(1M) manual page.

  Note   Most VxVM commands require superuser or equivalent privileges.

Please note the following limitation of volume sets:

• A maximum of 2048 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.
• Raw I/O from and to the component volumes of a volume set is supported under certain conditions.

  See "Raw device node access to component volumes" on page 368.

• 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" on page 311.

  See "Creating instant snapshots of volume sets" on page 340.

• 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.