Am 18.03.13 20:05, schrieb Stephan Budach:
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?
Thanks,
Stephan
Btw, LIO does support SCSI3 persistent reservations, so one could swap
scst with LIO and build multipathed iSCSI targets with it, unless I am
mistaken and have misread anything.
Regards,
Stephan
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