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Crooksey
Apprentice
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Joined: 26 Apr 2006
Posts: 239
Location: Vatican City

PostPosted: Tue May 28, 2013 12:40 pm    Post subject: Problem with mdadm creating new volumes Reply with quote

So I have 4 drives in my machine
Code:

/dev/sda
/dev/sdb
/dev/sdc
/dev/sdd

I have my entire system installed on /dev/sdb

I want to keep it this way, I then want to create a raid volume /dev/md with /dev/sdc and /dev/sdd

I will then rsync the contents of /dev/sdb into /dev/md

So I have copied the partition layout of /dec/sdb onto /dev/sdc and /dev/sdd and the filesytem type is "linux_raid_m"

I get either one or two errors when creating a new volume..
Code:

tradesite luke # mdadm --create /dev/md6 --chunk=4 --level=0 --raid-devices=2 /dev/sdc6 /dev/sdd6
mdadm: /dev/sdc6 appears to contain an ext2fs file system
size=195310204K  mtime=Thu Jan  1 01:00:00 1970
mdadm: /dev/sdc6 appears to be part of a raid array:
level=raid0 devices=2 ctime=Tue May 28 13:14:51 2013
mdadm: /dev/sdd6 appears to contain an ext2fs file system
size=195310204K  mtime=Thu Jan  1 01:00:00 1970
mdadm: /dev/sdd6 appears to be part of a raid array:
level=raid0 devices=2 ctime=Tue May 28 13:14:51 2013
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: RUN_ARRAY failed: Invalid argument
tradesite luke # dmesg | grep md:
[1052764.853209] md: bind<sdc6>
[1052764.861132] md: bind<sdd6>
[1052764.861929] md: personality for level 0 is not loaded!
[1052764.861943] md: md6 stopped.
[1052764.861947] md: unbind<sdd6>
[1052764.868698] md: export_rdev(sdd6)
[1052764.868707] md: unbind<sdc6>
[1052764.875695] md: export_rdev(sdc6)
[1052846.746937] md: bind<sdc6>
[1052846.747256] md: bind<sdd6>
[1052846.748030] md: personality for level 0 is not loaded!
[1052846.748044] md: md6 stopped.
[1052846.748047] md: unbind<sdd6>
[1052846.753686] md: export_rdev(sdd6)
[1052846.753695] md: unbind<sdc6>
[1052846.762671] md: export_rdev(sdc6)

Or I either get..

Code:

tradesite luke # mdadm --create /dev/md1 --chunk=4 --level=0 --raid-devices=2 /dev/sdc1 /dev/sdd1
mdadm: device /dev/sdc1 not suitable for any style of array
tradesite luke # dmesg | grep md:
tradesite luke #

I cannot work out why this is failing, although I can see the apparent error "md: personality for level 0 is not loaded!" I cant seem to find a specific fix for it.
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py-ro
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Joined: 24 Sep 2002
Posts: 1459
Location: St. Wendel

PostPosted: Tue May 28, 2013 1:57 pm    Post subject: Reply with quote

Do you got RAID Support into your Kernel? Modules loaded?
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