Thanks Heinz,
this looks like what i was serching for. still, it didn't work out.
the first call of this command issued (apart from multiple "couln't find
device..")
"device-mapper ioctl cmd 9 failed: Das Argument ist ungültig"
(i hate german error messages, who invented this? it says "illegal
argument")
but also "1 logic voliume(s) .. now active".
lvscan says "Volume group ... not found"
mount fails.
what should i try next?
regards, Chris
PS: about the stripes, I don't think I have any.
On Wed, 31 May 2006 23:31:54 +0200, Heinz Mauelshagen
<mauelshagen@redhat.com> wrote:
vgchange -ay --partial
On Wed, May 31, 2006 at 01:45:46PM +0100, Graham Wood wrote:
On Wed, May 31, 2006 at 02:34:04PM +0200, chris wrote:
> I have create a volume group with 4 250GByte harddisks with an ext3
file
> system on the 1TB result.
Stripe or concat?
> now the third harddisk failed and the volume group is "dead" -
obviously.
The way you created the volume had no redundancy - therefore 25% of
your data is gone, as
well as the volume's "completeness".
If you did a concat, then you (with playing) may be able to get some
data back from the
first 500GB of the volume - but I wouldn't want to rely on anything
that came back from it.
I'd suggest getting hold of 2 identical blank disks, and doing a binary
(dd) copy of disks 1
and 2 to them - and then work on them. You might be able to use
vgcfg{backup,restore} to
tell the system that this volume is actually only on 2 disks....
However, anything that
references data > 500GB into the volume is almost definitely lost -
because although you've
got 750G-1TB, it's almost all going to be linked back into the section
that you've lost.
If you did a stripe, then you can forget getting any data back off it.
You've lost every
4th block of whatever size you striped on. E.g. with a 64k stripe
size, you'll have lost
from 128k-192k, 384k-448k, etc. - and there's almost definitely going
to be nothing
salvagable from that.
Graham
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