[DRBD-user] How Long Can a Primary Stay Disconnected from a Secondary?

Digimer linux at alteeve.com
Thu Mar 3 16:13:07 CET 2011

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. :)

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