[DRBD-user] ***SPAM*** Re: drbd online resize

Jiri Vitek j.vitek at funlife.cz
Thu Apr 15 17:57:35 CEST 2010

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

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.

> 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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