[OpenIndiana-discuss] iSCSI disaster recovery on two servers running Comstar services

[Andrej Javoršek]

Hello,
if iSCSI initiator is system that is able to do SW RAID1 you
can simultaneously use both targets ACTIVE-ACTIVE (I'm doing the same with
FC and Oi as initiator).
Otherwise in my experience it is imposible to modify (in background
(receive, rollback,...)) COMSTAR volume while it is exported.

Regards
Andrej

Sidetone: I have noticed your other question... ...I'm not sure about
performance since in my case I'm using Oi initiators, 4Gb FC connection and
only hosting (all VBox/Zone virtualized) Windows AD servers, Oi based
Apache web/mysql, and one M$ SQL but none are really disk IO hungry.



On Thu, Nov 15, 2012 at 12:28 PM, Florian <florian at acw.at> wrote:

> Hello,
>
> I have some questions about the disaster recovery of a Comstar iSCSI
> volume.
>
> We have two equal servers, with both running Comstar service to serve
> iSCSI volumes.
>
> I do zfs send and receive of all iSCSI volumes to an other  server and I
> copy a backup of the Comstar configuration to the other server, too.
>
> My problem is now, that both servers have Comstar iSCSI volumes configured
> and if one server fails, how can I bring back up the iSCSI volumes of the
> failed server?
>
> Normally, I load the configuration backup to the other server's Comstar
> service and import the iSCSI volumes, but this is not possible, because the
> other server has also a running Comstar configuration.
> What is the best solution here? Is it possible to merge the Comstar
> configuration of the failed server and the running server?
> Has someone any experience with this constellation?
>
> Would be great if someone can help me!
>
> Regards
> Florian
>
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