On 2011-03-03 16:13, Digimer wrote: > 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.
Gaaah, we'd never be crash safe if we recorded this in memory only. One node fails, we track the sync, the other node fails, boom the sync information is gone. No, DRBD is a wee bit smarter than that. :) You can overwrite your whole device while disconnected. DRBD will simply eventually have flipped all the bits in the bitmap. Which it keeps on stable storage, obviously. Florian
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