RE: mdadm question

["Leslie Rhorer" <lrhorer@xxxxxxxxxxx>]

> -----Original Message-----
> From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid-
> owner@xxxxxxxxxxxxxxx] On Behalf Of Robert Minvielle
> Sent: Tuesday, March 02, 2010 7:15 PM
> To: linux-raid@xxxxxxxxxxxxxxx
> Subject: mdadm question
> 
> 
> I am trying to setup a new raid array on a debian box, and I have not run
> into
> this problem before. I could not find a mdadm list, so I will ask here. If
> this
> is totally off topic, please disregard.
> 
> 
> I am attempting to setup a raid 6 array, but this is failing so I backing
> down
> to a no-frills raid 5 array. The system is Debian5, stock kernel, stock
> everything.
> The mdadm is the stock debian, pulled with apt-get, version 2.6.7.
> The machine in question has one IDE drive for linux, and 45 SATA drives.

	I think that's your problem.  The default for 2.6.7 is a version .90
superblock.  The .90 superblock is limited to 28 devices in the array.  Ise
a version 1.x superblock, instead.

> Debian
> sees all of the drives, and I have fdisked all of them with one partition
> of type
> fd (Linux autodetect raid). fdisk -l /dev/sd[a-z] /dev/sdaa[a-s] shows
> them all
> with no problems.
> 
> The issue is that when I do a
> 
> mdadm --create /dev/md0 --level=5 --raid-devices=45 /dev/sd[a-z]1
> /dev/sda[a-s]1

	Make that:
` mdadm --create /dev/md0 --level=5 --raid-devices=45 --metadata=1.x`
/dev/sd[a-z]1  /dev/sda[a-s]1

	where x is 0, 1, or 2 and I think you'll be fine.  See the man page.
 
> to create a raid array with no spares, all defaults, it returns with
> 
> invalid number of raid devices.
> 
> I have searched the web to no avail. --verbose does not increase
> verbosity. There
> are no debug switches (that I know of) to mdadm. log files show nothing.
> Leaving off
> --raid-devices=45 does nothing. Changing the number of devices just for
> fun does
> nothing. (45,44,43,2,whatever). I am not sure if this is a problem with
> this version
> in debian, the number of drives that I have, or the setup. I have done
> this before
> (with a few less drives) with no problems.
> 
> Any suggestions would be appreciated.
> 
> Thanks.
> 
> 
> 
> 
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