[mythtv-users] OT: 3ware 9500 - expanding RAID5 requires a reboot?

[Greg Oliver]

 Sun, Aug 1, 2010 at 5:16 AM, Stroller <stroller at stellar.eclipse.co.uk> wrote:
> Hi there,
>
> I've just added a 5th drive to the RAID5 array on my 3ware, (issuing `sudo
> tw_cli /c0/u1 migrate type=raid5 disk=3`)  and after about 30 hours the
> migration has completed.
>
> tw_cli shows the new size, but parted (e.g. sudo `parted /dev/sdb1 p`) and
> fdisk do not.
>
> I was under the impression that, upon completion of the migration of the
> array the controller would inform the o/s. "hey, the drive's bigger now" and
> allow the filesystem to be expanded.
>
> Obviously I can reboot the system, but I had thought and hoped that was
> unnecessary. Perhaps my kernel is missing a relevant option? Googling turns
> up some hits that suggest a reboot IS necessary for the new space to be
> recognised, some hits that suggest not.
>
> I'm surprised I didn't have this problem before, when I (presumably) added
> the 4th drive to the array.
>
> Thanks in advance for any pointers,

You just need to issue a partprobe against the partition..  AFAIK,
that is still the only tool that updates partirion tables to the
kernel..

-Greg