On Wed May 08, 2013 at 06:05:32 +0200, Roberto Nunnari wrote:
> Robin Hill wrote:
> > On Wed May 08, 2013 at 04:19:33PM +0200, Roberto Nunnari wrote:
> >
> >> Robin Hill wrote:
> >>> On Fri May 03, 2013 at 06:28:02PM +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
> >>>>> - fail and remove the old disk partitions from the arrays
> >>>>> - shrink the arrays back down to 2 members
> >>>>> - remove the old disks
> >>>>>
> >>>>> Then, if you're keeping the same number of partitions but increasing the
> >>>>> size:
> >>>> Ok.. got here.
> >>>>
> >>>>> - grow the arrays to fill the partitions
> >>>>> - grow the filesystems to fill the arrays
> >>>> Now the scary part.. so.. here I believe I should give the following
> >>>> commands:
> >>>>
> >>>> mdadm --grow /dev/md0 --size=max
> >>>> mdadm --grow /dev/md1 --size=max
> >>>> mdadm --grow /dev/md2 --size=max
> >>>>
> >>> Yep, that's right. Make sure they've actually grown to the correct size
> >>> before you progress though - I have had one occasion where using
> >>> --size=max actually ended up shrinking the array and I had to manually
> >>> work out the size to use in order to recover. That was using an older
> >>> version of mdadm though, and I've not seen it happen since.
> >>>
> >>>> and after that
> >>>>
> >>>> fsck /dev/md0
> >>>> fsck /dev/md1
> >>>> fsck /dev/md2
> >>>>
> >>> You'll need 'fsck -f' here to force it to run.
> >> humm.. as /dev/md0 is mounted on / I probably should boot from a cd, and
> >> run fsck and resize2fs from there.. maybe using UUIDs, right?
> >>
> > You can just skip the fsck and run resize2fs - it'll work fine on a
> > mounted filesystem. It'll probably be safer to do it offline though.
> >
> > Cheers,
> > Robin
>
> I'd rather stay on the safe side.. how do I assemble the array if I boot
> from a cd?
>
> something like:
>
> mdadm --scan --assemble --uuid=a26bf396:31389f83:0df1722d:f404fe4c
>
> would to the job and let me with a /dev/mdX I will be able to work with
> (fsck and resize2fs)?
>
That should do it, yes. If not, you can always do it explicitly with:
mdadm -A /dev/md0 /dev/sd[abcd]1
You'd need to double-check what the device names end up as though.
Cheers,
Robin
--
___
( ' } | Robin Hill <robin@xxxxxxxxxxxxxxx> |
/ / ) | Little Jim says .... |
// !! | "He fallen in de water !!" |
Attachment:
signature.asc
Description: Digital signature
