[linux-lvm] LE/PE Question

Steven Lembark lembark at wrkhors.com
Thu Nov 21 10:33:02 UTC 2002

-- "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[23].

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.

Steven Lembark                               2930 W. Palmer
Workhorse Computing                       Chicago, IL 60647
                                            +1 800 762 1582

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