Mailinglist Archive: opensuse (1995 mails)

[brian@xxxxxxxxx]

Quoting "David C. Rankin" <drankinatty@xxxxxxxxxxxxxxxxxx>:

> Listmates,
>
>       I have a quandary. I had two Seagate 750G drives in a software raid on
> machine
> A. I needed to remove one of the drives and RMA it due to excessive
> read/write
> head schizophrenia. I now have the device out of the box to RMA but I need to
> mount it to delete some of the data. I tried mounting is via usb, but
> received
> an error due to raid as the file type:
>
>  [23:03 alchemy:/home/david/linux/packages/SRPMS] # mount /dev/sdb1 /mnt/750
> mount: unknown filesystem type 'linux_raid_member'
>
>       So next I decided to create a temporary md0 on my laptop and add one 
> drive
> to
> the array. No dice:
>
> [23:06 alchemy:/home/david/linux/packages/SRPMS] # mdadm --create /dev/md0
> --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1
> mdadm: /dev/sdb1 appears to contain an ext2fs file system
>     size=732571864K  mtime=Fri Apr  3 20:21:45 2009
> mdadm: /dev/sdb1 appears to be part of a raid array:
>     level=raid1 devices=2 ctime=Fri Mar 27 15:38:36 2009
> mdadm: Cannot open /dev/sdc1: No such file or directory
> mdadm: create aborted
>
> "frickuth!"
>
> OK maybe:
>
> [23:03 alchemy:/home/david/linux/packages/SRPMS] # mdadm --create /dev/md0
> --level=1 --raid-devices=1 /dev/sdb1
> mdadm: '1' is an unusual number of drives for an array, so it is probably
>      a mistake.  If you really mean it you will need to specify --force
> before
>      setting the number of drives.
>
> Again no joy!
>
>       Well, how to skin this cat, there must be an easy way, but obviously I'm
> struggling with it. What say the RAID gurus?

You don't need to mount the device to erase it.
dd if=/dev/zero of=/dev/sdb bs=4M
and for a 750G drive, come back in a coupkle hours.
you can monitor it's progress by "ps -ef |grep sdb" and get the pid of dd, say
it's 3405
then "while kill -USR1 3405 ;do sleep 1 ;done"

But setting that aside,
I think what you need to do is merely assemble the array, and with the word
missing in place of the non-present devices.

mdadm -A /dev/md9 /dev/sdb1 missing
mkdir /md9
mount /dev/md9 /md9

Untested, and assumes /dev/sdb1 contains a mdraid superblock to fill in all the
details left unspecified on the mdadm command line.

--
bkw

----------------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.
-- 
To unsubscribe, e-mail: opensuse+unsubscribe@xxxxxxxxxxxx
For additional commands, e-mail: opensuse+help@xxxxxxxxxxxx