[OpenAFS] best way to recover after HD breakdown?
Wed, 08 Jun 2005 13:07:00 -0400
On Wednesday, June 08, 2005 01:12:02 PM +0200 Frank Burkhardt
> On Wed, Jun 08, 2005 at 10:29:04AM +0200, Lars Schimmer wrote:
>> One big HD in our cell just breaked down.
>> Now we've got some RO copies on 1.2.13 fileserver and some "non existent"
>> volumes, which RW copy were on that HD and no RO were available.
>> In 1.2.13 there was no way to convert RO to RW, right?
> There is - but you need a patch. Have a look at
> You'll find patched 1.2.13-debian-packages there.
>> If there is NO backup of that harddisk, only these RO, which is the best
>> way to recover that data?
> vos dump [...] | vos restore [...]
You can do a bit better than that, using 'vos copy'. I can't remember
whether this command appeared in any 1.2.x release, but it shouldn't matter
- unlike convertROtoRW, it doesn't depend on new features in the volserver,
so you can just use a 'vos' binary from a recent 1.3.x release against your
existing servers. Use a command like
vos copy foo.RO <fromserver> <frompart> foo <toserver> <topart> -live
Don't forget the -live; you can't copy from a RO volume without it.
This can considerably faster than dump|restore, because data is copied
directly from one volserver to the other (or they can be the same server),
without sending it to your workstation and back.
-- Jeffrey T. Hutzelman (N3NHS) <firstname.lastname@example.org>
Sr. Research Systems Programmer
School of Computer Science - Research Computing Facility
Carnegie Mellon University - Pittsburgh, PA