[mythtv-users] Totally OT - but need help wit RAID5 array

[Robin Hill]

On Fri Nov 17, 2006 at 10:52:05AM -0500, James Pifer wrote:

> On Fri, 2006-11-17 at 09:46 -0600, Carl Fongheiser wrote:
> > On 11/17/06, James Pifer <jep at obrien-pifer.com> wrote:
> >         
> >         It tries, but I still get the same thing :-( :
> >         
> >         [root at storage ~]# mdadm --create --verbose /dev/md0
> >         --assume-clean --force --level=5
> >         --raid-devices=3 /dev/hdb /dev/hdc dev/hdd
> >         mdadm: layout defaults to left-symmetric 
> >         mdadm: chunk size defaults to 64K
> >         mdadm: /dev/hdb appears to contain an ext2fs file system
> >             size=312581632K  mtime=Wed Nov 15 09:54:22 2006
> >         mdadm: /dev/hdb appears to be part of a raid array:
> >             level=raid5 devices=3 ctime=Wed Nov 15 09:42:22 2006 
> >         mdadm: /dev/hdc appears to be part of a raid array:
> >             level=raid5 devices=3 ctime=Wed Nov 15 09:42:22 2006
> >         mdadm: Cannot open dev/hdd: No such file or directory
> >         mdadm: create aborted
> >         [root at storage ~]#
> > 
> > No guarantee of success, but you could try executing this from the
> > root directory, rather than root's home directory.
> > 
> > Carl Fongheiser
> 
> That did make a difference but I got this scary question. Is it going to
> leave the data alone? 
> 
> [root at storage /]# mdadm --create --verbose /dev/md0 --assume-clean --force --level=5 --raid-devices=3 /dev/hdb /dev/hdc dev/hdd
> mdadm: layout defaults to left-symmetric
> mdadm: chunk size defaults to 64K
> mdadm: /dev/hdb appears to contain an ext2fs file system
>     size=312581632K  mtime=Wed Nov 15 09:54:22 2006
> mdadm: /dev/hdb appears to be part of a raid array:
>     level=raid5 devices=3 ctime=Wed Nov 15 09:42:22 2006
> mdadm: /dev/hdc appears to be part of a raid array:
>     level=raid5 devices=3 ctime=Wed Nov 15 09:42:22 2006
> mdadm: size set to 156290816K
> Continue creating array?
> 
I wouldn't do, no - hdd doesn't contain any valid data so adding it
into the array will only lead to trouble.  Instead try replacing dev/hdd
with missing, i.e.

        mdadm --create --verbose /dev/md0 --assume-clean --force \
        --level=5 --raid-devices=3 /dev/hdb /dev/hdc missing

Odd that it complains about the missing drive now but was quite happy
creating it the array without it originally!

Cheers,
        Robin
-- 
     ___        
    ( ' }     |       Robin Hill        <myth at robinhill.me.uk>  |
   / / )      | Little Jim says ....                            |
  // !!       |      "He fallen in de water !!"                 |
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