[linux-lvm] LE/PE Question
Heinz J . Mauelshagen
mauelshagen at sistina.com
Fri Nov 22 03:45:02 UTC 2002
On Thu, Nov 21, 2002 at 10:38:31AM -0600, Steven Lembark wrote:
> -- "Heinz J . Mauelshagen" <mauelshagen at sistina.com>
> > On Tue, Nov 19, 2002 at 09:50:39PM +0100, kalle at idlar.nu wrote:
> >> Hi!
> >> Im researching some diffrent what-if-scenarios to be more prepared if
> >> our lvm fails. and I'm wondering..Is there any utility to find which
> >> file (or fs inode) a specific LE/PE is assigned to?
> ># lvdisplay -v /dev/YourVG/YourLV # displays mapping logical -> physical
> ># extents lvdisplay -v /dev/YourPV # displays mapping physical -> logical
> ># extents
> >> What I would like to acomplish it to be able to know what files are
> >> located on a specific disk in a
> >> VG/LV. So if I detect that a disk in a LV is starting to fail I would
> >> like to know which files are more
> >> likely to be non-recoverable.
> > You need to 'ask' the filesystem, where it puts stuff ;)
> > I.e. "debugfs /dev/YourVG/YourLV" for ext.
> 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.
> Steven Lembark 2930 W. Palmer
> Workhorse Computing Chicago, IL 60647
> +1 800 762 1582
> linux-lvm mailing list
> linux-lvm at sistina.com
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
Heinz -- The LVM Guy --
*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***
Heinz Mauelshagen Sistina Software Inc.
Senior Consultant/Developer Am Sonnenhang 11
Mauelshagen at Sistina.com +49 2626 141200
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