[DRBD-user] primary/secondary problem

Matthias Weigel matthias.weigel at maweos.de
Tue Jun 13 15:50:27 CEST 2006

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


is it possible, that there is some confusion in this thread about what 
primary actually means?
Here is my understanding:

Primary is where you USE the drbd blockdevice (e.g. mount it). Which 
node becomes Primary is decided by heartbeat or "drbdadm up".

During syncronizing, Syncsource is the place where your valid data is ON 
DISK. Which node becomes Syncsource is normally decided by drbd 
metadata. When synchronizing is complete, both nodes have valid 
(identical) data.

Primary can be Synctarget! Then valid data is fetched over the network 
from Secondary.

Please correct me somebody if this is inaccurate or wrong.

Best Regards


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