Red Hat Summit5.4.17. Controlling Logical Volume Activation
You can flag a logical volume to be skipped during normal activation commands with the
-k or --setactivationskip {y|n} option of the lvcreate or lvchange command. This flag is not applied during deactivation.
You can determine whether this flag is set for a logical volume with the
lvs command, which displays the k attribute as in the following example.
lvs vg/thin1s1
# lvs vg/thin1s1
LV VG Attr LSize Pool Origin
thin1s1 vg Vwi---tz-k 1.00t pool0 thin1
By default, thin snapshot volumes are flagged for activation skip. You can activate a logical volume with the
k attribute set by using the -K or --ignoreactivationskip option in addition to the standard -ay or --activate y option.
The following command activates a thin snapshot logical volume.
lvchange -ay -K VG/SnapLV
# lvchange -ay -K VG/SnapLV
The persistent "activation skip" flag can be turned off when the logical volume is created by specifying the
-kn or --setactivationskip n option of the lvcreate command. You can turn the flag off for an existing logical volume by specifying the -kn or --setactivationskip n option of the lvchange command. You can turn the flag on again with the -ky or --setactivationskip y option.
The following command creates a snapshot logical volume without the activation skip flag
lvcreate --type thin -n SnapLV -kn -s ThinLV --thinpool VG/ThinPoolLV
# lvcreate --type thin -n SnapLV -kn -s ThinLV --thinpool VG/ThinPoolLV
The following command removes the activation skip flag from a snapshot logical volume.
lvchange -kn VG/SnapLV
# lvchange -kn VG/SnapLV
You can control the default activation skip setting with the
auto_set_activation_skip setting in the /etc/lvm/lvm.conf file.
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