Re: replacing drives

[Robin Hill <robin@robinhill.me.uk>]

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On Thu May 02, 2013 at 03:56:54PM +0200, Roberto Nunnari wrote:

> Robin Hill wrote:
> > The safest option would be:
> >  - add in the new disks
> >  - partition to at least the same size as your existing partitions (they
> >    can be larger)
> >  - add the new partitions into the arrays (they'll go in as spares)
> >  - grow the arrays to 4 members (this avoids any loss of redundancy)
> >  - wait for the resync to complete
> >  - install grub/lilo/syslinux to the new disks
> 
> Ok.. got here.
> 
> 
> >  - fail and remove the old disk partitions from the arrays
> 
> Now.. I may need some guidance for the next steps.. please correct me if 
> I'm wrong..
> 
> to fail the old disk partition from the arrays I should:
> mdadm -f /dev/md0 /dev/sda1
> mdadm -f /dev/md1 /dev/sda2
> mdadm -f /dev/md2 /dev/sda3
> mdadm -f /dev/md0 /dev/sdc1
> mdadm -f /dev/md1 /dev/sdc2
> mdadm -f /dev/md2 /dev/sdc3
> 
> and to remove the old disk partition from the arrays I should:
> mdadm -r /dev/md0 /dev/sda1
> mdadm -r /dev/md1 /dev/sda2
> mdadm -r /dev/md2 /dev/sda3
> mdadm -r /dev/md0 /dev/sdc1
> mdadm -r /dev/md1 /dev/sdc2
> mdadm -r /dev/md2 /dev/sdc3
> 
> correct?
> 
Assuming sda & sdc are your old drives, yes (they were sda & sdb in your
original mail, but possibly they've been reordered if you've rebooted
with the new drives in).

> 
> >  - shrink the arrays back down to 2 members
> 
> to shrink the arrays back down to two members:
> mdadm --grow --raid-devices=2 /dev/md0
> mdadm --grow --raid-devices=2 /dev/md1
> mdadm --grow --raid-devices=2 /dev/md2
> 
> correct?
> 
Yes, that's all correct.

Cheers,
    Robin
-- 
     ___        
    ( ' }     |       Robin Hill        <robin@robinhill.me.uk> |
   / / )      | Little Jim says ....                            |
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