La commande 'chpv' permet de modifier les caractéristiques d"une unité 'hdisk'.
Cela peut permettre notamment de définir un disque comme secours(Hotspare) dans un VG.
Ainsi, la commande 'chpv -hy hdisk5' va définir le disque hdisk5 comme secours disponible en cas de problèmes matériel sur les disques d'origine.
De plus, la commande 'chpv' permet de changer l'état d'une unité pour préciser qu'elle est bien active( suite à coupure temporaire) :
# chpv -v a hdisk4
La documentation officielle ainsi que la syntaxe sont données ci-dessous :
chpv Command
Purpose
Changes the characteristics of a physical volume in a volume group.
Syntax
chpv [ -h hotspare ] [ -a allocation ] [ -v availability ] [ -c ] [ -p mirrorpool ] [ -P ] [ -m mirrorpool ]
physicalvolume ... [ -C hdiskname ]
Description
The chpv command changes the state of the physical volume in a volume group by setting allocation permission to either
allow or not allow allocation and by setting the availability to either available or removed. This command can also be
used to clear the boot record for the given physical volume. Characteristics for a physical volume remain in effect
unless explicitly changed with the corresponding flag.
Note: To use this command, you must either have root user authority or be a member of the system group.
You can use the Volumes application in Web-based System Manager (wsm) to change volume characteristics. You can also
use the System Management Interface Tool (SMIT) smit chpv fast path to run this command.
Flags
Item
Description
-a allocation
Sets the allocation permission for additional physical partitions on the physical volume specified by the
physicalvolume parameter. Either allows (yes) the allocation of additional physical partitions on the physical
volume, or prohibits (no) the allocation of additional physical partitions on the physical volume. The allocation
variable can be either:
y
Allows the allocation of additional physical partitions on the physical volume.
n
Prohibits the allocation of additional physical partitions on the physical volume. The logical volumes that
reside on the physical volume can still be accessed.
-c
Clears the boot record of the given physical volume.
-C hdiskname
Clears the owning volume manager from a disk. This flag is only valid when running as the root user. This command
will fail to clear LVM as the owning volume manager if the disk is part of an imported LVM volume group.
-h hotspare
Sets the sparing characteristics of the physical volume so that the physical volume can be used as a hot spare.
Also sets the allocation permission for physical partitions on the physical volume specified by the physicalvolume
parameter. This flag has no meaning for non-mirrored logical volumes. The hotspare variable can be either:
y
Marks the disk as a hot spare disk within the volume group it belongs to and prohibits the allocation of
physical partitions on the physical volume. The disk must not have any partitions allocated to logical
volumes to be successfully marked as a hot spare disk.
n
Removes the disk from the hot spare pool for the volume group in which it resides and allows allocation of
physical partitions on the physical volume.
-m mirrorpool
Changes the name of the mirror pool that is assigned to the specified disk to the value of the mirrorpool
parameter.
-p mirrorpool
Assigns the physical volume to a mirror pool. The name of a mirror pool can be up to 15 characters in length.
After mirror pools are enabled in a volume group, the volume group can no longer be imported into a version of AIX
(before AIX Version 6.1) that does not support mirror pools.
-P
Removes the physical volume from the mirror pool that is being assigned. The physical volume can only be removed
from the mirror pool if it has partitions that are allocated to a logical volume where mirror pools are enabled.
-v availability
Sets the availability of the physical volume. If you set the availability to closed, logical input and output to
the physical volume are stopped. You should close a physical volume when the physical volume is removed from
operation. Access to physical volume data by the file system or the virtual memory manager is stopped, but you can
continue to use the system management commands. The availability variable can be either:
a
Makes a physical volume available for logical input and output.
r
Makes a physical volume unavailable (removed) for logical input and output. If the physical volume is
required in order to maintain a volume group quorum, an error occurs and the physical volume remains open.
Examples
1 To close physical volume hdisk3, enter:
chpv -v r hdisk3 The physical volume is closed to logical input and output until the -v a flag is used.
2 To open physical volume hdisk3, enter:
chpv -v a hdisk3 The physical volume is now open for logical input and output.
3 To stop the allocation of physical partitions to physical volume hdisk3, enter:
chpv -a n hdisk3 No physical partitions can be allocated until the -a y flag is used.
4 To clear the boot record of a physical volume hdisk3, enter:
chpv -c hdisk3
Files
Item
Description
/usr/sbin
Directory where the chpv command resides.
/tmp
Directory where temporary files are stored while the command is running.
