[nzlug] LVM and toast....

[Andrew Bruce]

If they are marked as spares what about trying:

mdadm --add /dev/<raid_device> /dev/<drive_and_partition>

eg.

mdadm --add /dev/md0 /dev/hdc1

Andrew


Nevyn wrote:
> Nevermind - turns out that the raid device isn't starting as I'd hope.
> It's showing 2 disks as spares. There was a command suggested in a few
> places but they haven't helped at all.
> mdadm --assemble --force
>
> The only other reference I found to try and fix this error said the 
> following:
> Rewrite the RAID superblocks by mkraid --force
>
> Unfortunately raidtools is no longer in Ubuntu.
>
> On 4/1/07, Nevyn <nevynh at gmail.com> wrote:
>> Well.... took the dive. Ran the command - (read the page properly
>> which sorted the question I asked just a few minutes ago). This is the
>> output I got....
>>
>>   Incorrect metadata area header checksum
>>   Incorrect metadata area header checksum
>>   Incorrect metadata area header checksum
>>   Couldn't find device with uuid 
>> '92rPwd-7BkZ-x0uf-N9Lb-yTJa-tXjD-ckcHCr'.
>>   Device volume1 not found (or ignored by filtering).
>>
>> Umm... help?!?
>>
>> On 4/1/07, Nevyn <nevynh at gmail.com> wrote:
>> > Just another quick question....
>> >
>> > pvcreate --uuid "<some_long_string>" --restorefile
>> > /etc/lvm/archive/VolumeGroupName_XXXXX.vg <PhysicalVolume>
>> >
>> > What should <some_long_string> be set to or does it not matter?
>> >
>> > On 4/1/07, Jasper Bryant-Greene <jasper at albumltd.co.nz> wrote:
>> > > The file in /etc/lvm/backup is what you want. It's a textual dump of
>> > > your volume group's configuration.
>> > >
>> > > Cheers,
>> > > Jasper
>> > >
>> > >
>> > > On Sun, 2007-04-01 at 16:58 +1200, Nevyn wrote:
>> > > > Hi,
>> > > >
>> > > > Things are going very badly at the moment - suddenly the output of
>> > > > /proc/mdstat was showing that 2 disks had suddenly dropped off 
>> - 1 was
>> > > > showing a failure and I have no idea why the other one wasn't 
>> in there
>> > > > except that it was showing (s) next to it.
>> > > >
>> > > > Of course this meant that suddenly the array wasn't working which
>> > > > explains all the wierd behaviour I had suddenly started 
>> experiencing.
>> > > > After a few failed attempts to get the array to rebuild itself, I
>> > > > reboot the machine and lo and behold, the raid seems to have 
>> gotten
>> > > > itself together.
>> > > >
>> > > > Still wasn't mounting though so I ran vgscan - and got the 
>> following message:
>> > > >   Reading all physical volumes.  This may take a while...
>> > > >   Incorrect metadata area header checksum
>> > > >
>> > > > The lvm howto has this to say about it:
>> > > > "If you get the warning "incorrect metadata area header 
>> checksum" or
>> > > > something about not being able to find PV with UUID foo, you 
>> probably
>> > > > toasted the volume group descriptor area and lvm startup can't 
>> occur."
>> > > >
>> > > > and then has a command to restore the stuffed bits:
>> > > > pvcreate --uuid "<some_long_string>" --restorefile
>> > > > /etc/lvm/archive/VolumeGroupName_XXXXX.vg <PhysicalVolume>
>> > > >
>> > > > However, I don't have a .vg file anywhere that I can find. 
>> There is a
>> > > > file in the back up directory but I'm a little unsure about 
>> this as it
>> > > > doesn't have a .vg extension.
>> > > >
>> > > > Does anyone know how I can fix all this?
>> > > >
>> > > > Regards,
>> > > > Nevyn.
>> > > >
>> > > > _______________________________________________
>> > > > NZLUG mailing list NZLUG at linux.net.nz
>> > > > http://www.linux.net.nz/cgi-bin/mailman/listinfo/nzlug
>> > > --
>> > > Jasper Bryant-Greene <jasper at albumltd.co.nz>
>> > > Album Limited
>> > >
>> > > _______________________________________________
>> > > NZLUG mailing list NZLUG at linux.net.nz
>> > > http://www.linux.net.nz/cgi-bin/mailman/listinfo/nzlug
>> > >
>> > >
>> > >
>> >
>>
>
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