pvchange.1m (2010 09)

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pvchange(1M) pvchange(1M)

-z sparepv This option is only applicable for physical volumes belonging to volume groups

version 1.0. Sparing is not supported for physical volumes belonging to

volume groups version 2.0 or higher. This option requires the installation of

the optional HP MirrorDisk/UX software.

This option allows you to change the physical volume speciﬁed by pv_path into

a spare physical volume for its volume group, or change the speciﬁed spare

physical volume back into a regular physical volume for this volume group.

No physical extents from a spare physical volume will be available as part of

the "free" pool of extents in the volume group. A spare physical volume will

only be used in the event that another physical volume within this volume

group becomes unavailable (fails). sparepv can have one of the following

values:

y Change the speciﬁed physical volume to be a "stand-by" spare for its

volume group. The speciﬁed physical volume must not have extents allo-

cated on it (i.e., no logical volumes residing on it) at the time this com-

mand is issued. A stand-by spare physical volume will only be used in

the event of a failure of another physical volume -- prior to such a

failure, no logical volume is allowed to reside on it.

n Change the speciﬁed spare physical volume back into a regular physical

volume. If the physical volume was a stand-by spare, then all of the disk

space associated with it will be immediately available for use by logical

volumes. If the physical volume is an "active" spare, that is, it was previ-

ously a stand-by spare but then took over for a failed physical volume, it

will simply mark the physical volume as a regular member of its volume

group and the logical volumes residing on it will remain unchanged.

-p proactivepolling (See WARNINGS section). This option speciﬁes LVM’s proactive polling

behavior on alternate links. proactivepolling can have one of the following

values:

y Enable LVM’s proactive polling for alternate links of a physical volume.

LVM will periodically test alternate links. This is the default.

n Disable LVM’s proactive polling for alternate links of a physical volume.

LVM will not periodically test alternate links.

Attaching and Detaching Physical Volumes

Detaching a physical volume makes the data on that disk unavailable. LVM will not write or read any

user data or LVM metadata to the disk while it is detached. Consequently, it is important for the

administrator to ensure that the data on the disk is sufﬁciently mirrored to satisfy availability require-

ments prior to making the device unavailable by detaching it.

Although detaching a path or physical volume ensures it is unavailable to LVM, attaching a path or phy-

sical volume will not necessarily make the path or physical volume available again. Attaching a path or

physical volume only makes it available for LVM to use once the disk is working. For instance, if a disk is

spinning up, LVM will successfully attach the disk, but the disk will not be available until it is ready.

Detaching a physical volume or path only temporarily changes the status of the indicated path or physical

volume. However, it does not change the volume group conﬁguration. When a physical volume is

detached, it will automatically be attached again the next time the volume group is activated using the

vgchange command (see vgchange (1M)). If the objective is to permanently add or remove a path or

physical volume from the volume group, the vgextend or vgreduce commands (see vgextend (1M), and

vgreduce (1M)) should instead be used.

Warning: Detaching any physical volume or path using the

-a N or -a n options also disables

automatically attaching any paths to any of the physical volumes in the volume group. LVM will no

longer attempt to automatically recover any unattached physical volumes in the volume group, not just

the ones explicitly detached. To cause LVM to once again automatically attach devices in the volume

group use the -a y options of vgchange command.

Attaching or Detaching Physical Volumes in Shared Volume Groups

The scope of the

pvchange command is limited to the speciﬁc node on which it runs. Systems that are

part of a Serviceguard cluster operate independently. To replace disks that are part of a volume group

shared by a Serviceguard cluster, the physical volume must be detached and attached independently on

HP-UX 11i Version 3: September 2010 − 3 − Hewlett-Packard Company 3