-- "Heinz J . Mauelshagen" <mauelshagen@sistina.com>
The unit of failure, for all pratical purposes, is the LV
(unless you are into using dd on raw disk devices to make
your backups). If one drive is likely to fail then any LV
crossing that LV is going to get fried (short of RAID) and
will have to be restored.
With LVM2 (and deprecated LVM1.1) you are able to activate a VG even
though some of its PVs are inaccessable.
If any filesystem is mountable still depends on the availability
of alternate superblocks and (at least) the root directory.
Which seems to mean that the unit of failure still is
the LV: if an LV spans PV's and the PV looses data then
the LV is unusable. The VG being able to survive an offline
PV is a Very Good Thing but doesn't do anything to help
someone with a filesystem on an LV with half its extents
missing.
--
Steven Lembark 2930 W. Palmer
Workhorse Computing Chicago, IL 60647
+1 800 762 1582
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