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

[James Pifer]

On Fri, 2006-11-17 at 17:07 +0000, Robin Hill wrote:
> 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!
> 


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 missing
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?

James