[DRBD-user] dual primary mode with which FS

Thomas Mueller thomas at chaschperli.ch
Tue Mar 23 14:57:19 CET 2010

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

Am Tue, 23 Mar 2010 14:52:08 +0100 schrieb Michael Schwartzkopff:

> Am Freitag, 19. März 2010 14:12:30 schrieb
> Andreas.Ruetten at hansenet.com:
>> Hi list,
>> first of all please answer also to my email-address because I'm not
>> subscribed to the ML.
>> Here are my questions:
>> I have to set up drbd 8.0.14 (Debian stable) in dual-primary mode. One
>> node has to read and write while the other node only need read access.
>> Do I need GFS or OCFS?
> Not really if you can be sure that the second node ONLY reads.
>> Or would a simple etx3 sufficient enough?
> Yes. Mount option "read-only" in the second node.
> But beware: If case of a failover your ALSO would have to remount your
> directories to read-write on the second node to acchieve the high
> availability.

Hmm... i would not expect that ext3 (or any non cluster-filesystem) 
mounted on two primaries rw/ro  behaves like expected. i wouldn't do it.

- Thomas

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