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Re: [linux-lvm] LE/PE Question

-- "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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