[DRBD-user] How to stop using DRBD?

Florian Haas florian.haas at linbit.com
Mon Jan 21 08:24:24 CET 2008

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

On Saturday 19 January 2008 19:47:15 Ashish Shukla आशीष शुक्ल wrote:
> >>>>> "Doug" == Doug Porter <doug at LynxDGS.com> writes:
>     Doug> Friday, January 18, 2008, 4:32:17 PM, you wrote:
>     RM> what is the status of a cat /proc/drbd??
>     RM> is it synced? maybe the last time your tried there were not
> synced?? RM> post that result and lets go from there...
>     Doug> I take it from the tone of your answer that it would be expected
> that Doug> I could simply disable DRBD and mount the drive using /dev/hda7,
> Doug> assuming it was in a synced and healthy state when I stopped using
> Doug> DRBD? If so, that's great news. It's entirely possible that something
> Doug> was out of whack last time.
> Mounting /dev/hda7 should work fine, if your DRBD nodes are synced. As
> DRBD metadata is stored in the end of partition after filesystem, so
> it should work fine. Although, if you tried to re-enable DRBD on both
> nodes, a split brain might occur.

Of course, you won't be able to just "re-enable" after you modified data 
underneath DRBD. It may look like it works, but you'd have a totally broken 
setup as the information in your DRBD metadata would no longer match your 
real data. You'd have to to a full sync, or recreate metadata, or at least 
(8.2.4 and above only) run an online device verification.

But other than that, yes, Doug, you will be able to continue to mount and use 
your filesystem after you've disabled DRBD. Curious as I am I'd like to know 
what is prompting you to do that -- I always tend to sleep better when I know 
my data is in replicated storage, rather than stand-alone.


: Florian G. Haas 
: LINBIT Information Technologies GmbH
: Vivenotgasse 48, A-1120 Vienna, Austria

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