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Currently, we have two modes of activation, an unnamed nominal mode
(which I will refer to as "complete") and "partial" mode. The
"complete" mode requires that a volume group be 'complete' - that
is, no missing PVs. If there are any missing PVs, no affected LVs
are allowed to activate - even RAID LVs which might be able to
tolerate a failure. The "partial" mode allows anything to be
activated (or at least attempted). If a non-redundant LV is
missing a portion of its addressable space due to a device failure,
it will be replaced with an error target. RAID LVs will either
activate or fail to activate depending on how badly their
redundancy is compromised.
This patch adds a third option, "degraded" mode. This mode can
be selected via the '--activationmode {complete|degraded|partial}'
option to lvchange/vgchange. It can also be set in lvm.conf.
The "degraded" activation mode allows RAID LVs with a sufficient
level of redundancy to activate (e.g. a RAID5 LV with one device
failure, a RAID6 with two device failures, or RAID1 with n-1
failures). RAID LVs with too many device failures are not allowed
to activate - nor are any non-redundant LVs that may have been
affected. This patch also makes the "degraded" mode the default
activation mode.
The degraded activation mode does not yet work in a cluster. A
new cluster lock flag (LCK_DEGRADED_MODE) will need to be created
to make that work. Currently, there is limited space for this
extra flag and I am looking for possible solutions. One possible
solution is to usurp LCK_CONVERT, as it is not used. When the
locking_type is 3, the degraded mode flag simply gets dropped and
the old ("complete") behavior is exhibited.
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| .. | ||
| blkdeactivate.8.in | ||
| clvmd.8.in | ||
| cmirrord.8.in | ||
| dmeventd.8.in | ||
| dmsetup.8.in | ||
| fsadm.8.in | ||
| lvchange.8.in | ||
| lvconvert.8.in | ||
| lvcreate.8.in | ||
| lvdisplay.8.in | ||
| lvextend.8.in | ||
| lvm2-activation-generator.8.in | ||
| lvm-dumpconfig.8.in | ||
| lvm.8.in | ||
| lvm.conf.5.in | ||
| lvmcache.7.in | ||
| lvmchange.8.in | ||
| lvmconf.8.in | ||
| lvmdiskscan.8.in | ||
| lvmdump.8.in | ||
| lvmetad.8.in | ||
| lvmsadc.8.in | ||
| lvmsar.8.in | ||
| lvmthin.7.in | ||
| lvreduce.8.in | ||
| lvremove.8.in | ||
| lvrename.8.in | ||
| lvresize.8.in | ||
| lvs.8.in | ||
| lvscan.8.in | ||
| Makefile.in | ||
| pvchange.8.in | ||
| pvck.8.in | ||
| pvcreate.8.in | ||
| pvdisplay.8.in | ||
| pvmove.8.in | ||
| pvremove.8.in | ||
| pvresize.8.in | ||
| pvs.8.in | ||
| pvscan.8.in | ||
| vgcfgbackup.8.in | ||
| vgcfgrestore.8.in | ||
| vgchange.8.in | ||
| vgck.8.in | ||
| vgconvert.8.in | ||
| vgcreate.8.in | ||
| vgdisplay.8.in | ||
| vgexport.8.in | ||
| vgextend.8.in | ||
| vgimport.8.in | ||
| vgimportclone.8.in | ||
| vgmerge.8.in | ||
| vgmknodes.8.in | ||
| vgreduce.8.in | ||
| vgremove.8.in | ||
| vgrename.8.in | ||
| vgs.8.in | ||
| vgscan.8.in | ||
| vgsplit.8.in | ||