[DRBD-user] Reasons not to use allow-two-primaries with DRDB

karel04 at gmail.com karel04 at gmail.com
Fri May 18 18:29:11 CEST 2012

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


Hello,

I am in the process of setting up DRBD on my servers, the network
bandwidth being the bottleneck.  After having evaluated GlusterFS I
realised, that I need the instant read access offered by DRBD.

Logically I am able to separate partitions that would require access
from both nodes, and partitions where an asynchronous master-slave
sync is sufficient.  But as far as I understand, the benefits from
using Protocol A instead of C are limited, when the network is stable.

My question:
Are there any additional benefits from NOT using two primaries or
additional risks when using it? eg. would there be significant
performance gain by using ext4 instead of GFS2/OCFS2? Anything else I
should take into consideration?

Thanks for any ideas or pointers where to look.

Karel



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