Re: Disk /dev/md6 doesn't contain valid partition table
On Wed, Oct 29, 2008 at 05:44:31AM +0100, Francesco Pietra wrote:
> Major mistake (shutting down the ups unit) while doing a parallel
> computation on all 8 processors (UMA-type machine amd64 lenny with
> raid 1 two disks).
>
> On restarting the machine and the computation,
>
> "fdisk -l" showed
> "Disk /dev/md6 doesn't contain a valid partition table"
>
>
> "df -h" showed
> 97G 1.1G 91G 2% /home
> (which should have been ca 70% used).
>
> All other partitions were OK, as they should be.
It would help us to follow if you provided a map of device to
mount-point since, e.g. whe don't know what device is /home.
> "top -i" showed
> all 8 instances fo the parallel procedure
> md6_resync (CPU% 6)
> md5_resync (CPU% 0)
> kjournald
>
>
> After some time md6_resync, md5_resync, kjournald disappeared, leaving
> only the 8 parallel procedures.
>
> Commanding "cat density6.out" the parallel procedure seems to work
> regularly, confirmed by "la -l" which shows all files (some as large
> as 100MB) for the present computation and the 5 analogous computations
> already carried out (of these five computations I had scp sent a copy
> to my desktop).
>
> Where are the data for the current 6th computation being stored?
>
> The computer was then shutdown and restarted
>
> df -h output as above.
>
> fdisk -l
> Neither /dev/md6 nor /dev/md5 have a valid partition table.
>
> cd to my home shows all directories and files for work (in my home
> only data from computations, all applications installed in
> /usr/local).
>
> What could I do to set up the sytem in order before resuming the computation?
I don't suppose that you kept a copy of your partition table as part of
your backup script? e.g. /sbin/sfdisk -d <device>?
If so, you can write it back.
Doug.
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