Re: Disk /dev/md6 doesn't contain valid partition table
On Wed, Oct 29, 2008 at 05:44:31AM +0100, Francesco Pietra wrote:
> Hi:
> 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.
>
>
> "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.
Most people don't use partitions on thair md devices. They use
partitions on their disk and run md on those partitions with one
filesystem (or LVM) on the md devices.
> 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 suspect it is pretty much OK, except apparently having lost some files
in /home.
--
Len Sorensen
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