varyonvg

varyonvg Command



Purpose

Activates a volume group.

Syntax

varyonvg [ -b ] [ -c ] [ -f ] [ -n ] [ -p Number ] [ -s
] [ -u ] VolumeGroup 

Description

The varyonvg command activates the volume group specified by the VolumeGroup
parameter and all associated logical volumes. A volume group that
is activated is available for use. When a volume group is activated,
physical partitions are synchronized if they are not current.

A list of all physical volumes with their status is displayed to standard
output whenever there is some discrepancy between the Device Configuration
Database and the information stored in the Logical Volume Manager.
The volume group may or may not be varied on. You must carefully examine
the list and take proper action depending on each reported status
to preserve your system integrity. A list of every status and its
meanings can be found in the lvm_varyonvg subroutine.

If the volume group cannot be varied on due to a loss of the majority
of physical volumes, a list of all physical volumes with their status
is displayed, and you are asked whether you want to override the vary-on
failure. In this case, you take full responsibility for the volume
group integrity.

Note:	To use this command,  either have root user authority
or be a member of the system group.

You can use the System Management Interface Tool (SMIT) to run this
command. To use SMIT, enter:

smit varyonvg

Flags

-b	Breaks disk reservations on disks locked as a result of a normal
varyonvg command. Use this flag on a volume group that is already
varied on. This flag only applies to AIX Version 4.2 or later.

Note:	This flag unlocks all disks in a given volume group.

-c	Varies the volume group on in concurrent mode. This is only possible
if the volume group is Concurrent Capable and the system has the HACAMP
product loaded and available. If neither is true, the volume group
will fail the varyon. This flag only applies to AIX Version 4.2 or
later.

-f	Forces the volume group to be made active even though the volume
group definition may be different on the physical volumes.

-n	Disables the synchronization of the stale physical partitions within
the VolumeGroup.

-p Number	All physical volumes must be available to use the varyonvg
command.

-s	Makes the volume group available in System Management mode only.
Logical volume commands can operate on the volume group, but no logical
volumes can be opened for input or output.

-u	Varies on a volume group, but leaves the disks that make up the
volume group in an unlocked state. Use this flag as part of the inital
varyon of a dormant volume group. This flag only applies to AIX Version
4.2 or later.

Attention: AIX Version 4.2 or later provides the flags -b and -u for
developers who use n-tailed DASD systems. The base design of LVM assumes
that only one initiator can access a volume group. The HACMP product
does work with LVM in order to synchronize multi-node accesses of
a shared volume group. However, multi-initiator nodes can easiliy
access a volume group with the -b and -u flags without the use of
HACMP. Your must be aware that volume group status information may
be compromised or inexplicably altered as a result of disk protect
(locking) being bypassed with these two flags. If you use the -b and
-u flags, data and status output cannot be guaranteed to be consistent.

Examples

1.	To activate volume group vg03, enter:

varyonvg vg03

2.	To activate volume group vg03 without synchronizing partitions
that are not current, enter:

varyonvg -n vg03

Files

/usr/sbin	Contains the varyonvg command directory.

/tmp	Stores the temporary files while the command is running.

Related Information

The chvg command, lspv command, lslv command, lsvg command, varyoffvg
command.

The lvm_varyonvg subroutine.

The System Management Interface Tool (SMIT): Overview in AIX Version
4 System Management Guide: Operating System and Devices explains the
structure, main menus, and tasks that are done with SMIT.

The Logical Volume Storage Overview in AIX Version 4 System Management
Guide: Operating System and Devices explains the Logical Volume Manager,
physical volumes, logical volumes, volume groups, organization, ensuring
data integrity, and allocation characteristics.

AIX HACMP/6000 Concepts and Facilities.