[DRBD-user] How Long Can a Primary Stay Disconnected from a Secondary?
dbarker at visioncomm.net
Thu Mar 3 16:25:57 CET 2011
No, the "dirty" bits are on disk. You can run degraded forever (or until the
disk fails). The sync upon reconnect will still be much shorter than a full
sync (unless the bitmap turns to x'FFFFFF's<g>).
From: drbd-user-bounces at lists.linbit.com
[mailto:drbd-user-bounces at lists.linbit.com] On Behalf Of Digimer
Sent: Thursday, March 03, 2011 10:13 AM
To: Robinson, Eric
Cc: drbd-user at lists.linbit.com
Subject: Re: [DRBD-user] How Long Can a Primary Stay Disconnected from a
On 03/03/2011 10:05 AM, Robinson, Eric wrote:
> I am thinking about taking a secondary node offline for maintenance
> during production hours. I assume it cannot stay offline forever
> because eventually the primary would run out of space to record
> changes that need to be sync'd. Is there a way to know in advance how
> long it is safe to stay disconnected without resync'ing?
As I understand it, dirty blocks are recorded in memory. I am sure there is
an upper limit to the counters, but I would hazard a guess that you would
run out of RAM first.
That said, I'd love to see some math from a DRBD developer. :)
E-Mail: digimer at alteeve.com
Node Assassin: http://nodeassassin.org
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