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Re: [DRBD-user] ***SPAM*** Re: drbd online resize
From: Jiri Vitek <j.vitek_at_nospam>Date: Thu Apr 15 2010 - 15:57:35 GMT
To: Stefan Seifert <nine@detonation.org>
On Thu, 2010-04-15 at 16:26 +0200, Stefan Seifert wrote:
> On Thursday 15 April 2010 16:00:26 Jiri Vitek wrote:
>
> > actualy i have drbd configured as:
> > master/slave
> > meta-disk: internal
> > backd blockevice is sw raid.. /dev/md0
> >
> > Now everything is working fine, but due to performance issue i need to
> > migrate form sw raid6 level to raid5..
> >
> > I have no problem with sw raid online resize. But when resize operation
> > will finished, then backing device's size will grow up +250GB
> >
> > There is no chance to resize both nodes simultaneously with finish in
> > the same time..
> >
> > How will drbd handle this situation? when one backing device will be
> > bigger then second one.
>
> drbd should handle different disk sizes just fine. Just follow the
> instructuions in the user's guide for online resize. Do _not_ take a node
> offline between RAID resize and drbd resize, as DRBD cannot find it's meta
> data anymore in that case.
>
ok
> You should also really, really consider putting your meta data on a RAID 1.
> You'll only need a couple of megabytes, so even if you used all available
> space on your disks for the RAID 6, there should be some /boot volume which
> you can shrink a little. Putting your meta data on a RAID 1 instead of RAID 5
> or 6 alone should give you a nice performance boost. Maybe you could even
> continue using RAID 6.
good tip, change to external meta-data must be provided offline, right?
>
> Regards,
> Stefan SEifert
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