[DRBD-user] DRBD primary/primary for KVM - what is the best option?

Michael Iverson miverson at 4hatteras.com
Tue May 11 16:09:08 CEST 2010

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


ietadm is the answer.

These might help:

http://old.nabble.com/IET-on-DRBD-howto--td20567810.html
http://www.gossamer-threads.com/lists/linuxha/users/45280
http://www.markround.com/archives/50-Building-a-redundant-iSCSI-and-NFS-cluster-with-Debian-Part-4.html

On Tue, May 11, 2010 at 9:51 AM, Bart Coninckx <bart.coninckx at telenet.be> wrote:
> On Tuesday 11 May 2010 15:15:34 Michael Iverson wrote:
>> I've done about zero research into this, but perhaps you could run two
>> separate daemon instances, one listening on each IP.
>>
>> On Tue, May 11, 2010 at 8:55 AM, Bart Coninckx
> <bart.coninckx at telenet.be>wrote:
>> > On Tuesday 11 May 2010 12:58:45 Michael Iverson wrote:
>> > > I'd be quite interested as well, obviously. So this is what we would
>> > > end up with:
>> > >
>> > > Host A is primary for drbd volume 1, and secondary for drbd volume 2.
>> > > It acts as an iSCSI target for whatever's on volume 1.
>> > >
>> > > Host B is primary for volume 2, and secondary for volume 1. It acts as
>> > > a target for whatever's on volume 2.
>> > >
>> > > If either node fails, the opposite node takes over the secondary
>> > > volume, and exports its fallen comrade's iSCSI targets.
>> > >
>> > > This idea could possibly be extended with Ben's approach of one DRBD
>> > > volume per iSCSI target. (Except that it would be in a
>> > > primary/secondary role, instead of primary/primary.) This would make
>> > > the process of rebalancing the load between the two nodes fairly
>> > > trivial.
>> > >
>> > > Mike
>> > >
>> > > On Tue, May 11, 2010 at 5:09 AM, Bart Coninckx
>> > > <bart.coninckx at telenet.be
>> >
>> > wrote:
>> > > >> It is. I'm planning to showcase this in one of our upcoming
>> > > >> webinars.
>> > > >>
>> > > >> Cheers,
>> > > >> Florian
>> > > >
>> > > > Excellent, any timeframe on this? As it happens I'm dealing with a
>> >
>> > setup
>> >
>> > > > now that could definitely benefit from this.
>> > > >
>> > > > B.
>> > > > _______________________________________________
>> > > > drbd-user mailing list
>> > > > drbd-user at lists.linbit.com
>> > > > http://lists.linbit.com/mailman/listinfo/drbd-user
>> >
>> > Agreed, but what might be less trivial is to convince a running IETD
>> > target to
>> > have the config for the "other" targets merged to the existing targets
>> > and at
>> > the same time bind to the new secondary IP address, preferably while not
>> > breaking running operation. This all should be taken care of by
>> > Heartbeat.
>> >
>> > I'm going to try to dive into the challenge and report back to the list,
>> > unless the webinar would happen fairly soon.
>> >
>> >
>> > B.
>> > _______________________________________________
>> > drbd-user mailing list
>> > drbd-user at lists.linbit.com
>> > http://lists.linbit.com/mailman/listinfo/drbd-user
>>
>
> Not possible:
>
> http://sourceforge.net/mailarchive/message.php?msg_id=02dd01c8263f%244496ae60%245dd810d1%40e3demo
>
>
> Rgds,
>
> B.
> _______________________________________________
> drbd-user mailing list
> drbd-user at lists.linbit.com
> http://lists.linbit.com/mailman/listinfo/drbd-user
>



-- 
Dr. Michael Iverson
Director of Information Technology
Hatteras Printing



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