[DRBD-user] Dual-primary setup: disconnecting

Stephan Budach stephan.budach at jvm.de
Mon Mar 18 20:05:09 CET 2013

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

Am 18.03.13 10:07, schrieb Lars Ellenberg:
> On Sun, Mar 17, 2013 at 08:19:26AM +0100, Stephan Budach wrote:
>> Hi all,
>> I am running DRBD 8.4.3 in a dual-pri setup. DRBD interlink is
>> through a 10 GbE Intel Cx520 link, which is piggy-backed between the
>> two Supermicro boxes. I have configured two SCST iscsi targets from
>> two DRBD volumes, which configured as multipathed targets on three
> Don't.
> Simply: Don't.
> Multipath expects to talk via more than one path to *the same target*.
> What your setup does it have multipath talk (via one path each) to
> *two different targets*, that don't know of each other,
> and happen to be able to present the same data most of the time.
> As iSCSI is not just about READs and WRITEs, but, especially in a
> clustered setup, about reservations and other management commands,
> this CAN NOT WORK, and that is NOT drbd's fault.
> So just don't.
> Thank you.
> 	Lars
Hi Lars,

okay, point taken, but what about the issue with drbd disconnecting when 
both primary get under high load? Even without iSCSI access this 
shouldn't happen, should it?


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