Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

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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.

Note Most VxVM commands require superuser or equivalent privileges.

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” on page 261 and “Creating

Instant Snapshots of Volume Sets” on page 284 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.