Actually, automatic failover will not be necessary, it is after all only
a mail server in an environment with fairly resilient users.
They'd be quite happy to have to call a sysadm up for manual failover.
I think in an almost unsupported OS like OI is today, one shouldn't rely
on anything but the most basic stuff. I wouldn't expect to ever be able
to test a hacked-up auto failover mechanism well enough to hand it over
to an unsuspecting colleague with little experience outside Windows or Mac.
So: manual failover is absolutely OK.
On 2011-12-06 03:39, [email protected] wrote:
Message: 2 Date: Mon, 5 Dec 2011 17:06:33 -0600 From: Lucas Van Tol
<[email protected]> To: <[email protected]>
Subject: Re: [OpenIndiana-discuss] OpenIndiana/ZFS mail server HA
config Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1" I had been trying to
work out some kind of HA using iscsi LUNS + ZFS mirror on top of that;
but I never got around to figuring out an automated failover process.
You would want the master to not share out it's LUN; and the other
node to check if there is a system at the 'master' address before
trying to become the master. It probably wouldn't be very fast, but it
might be sufficient if you can get the failover worked out.
> Date: Tue, 6 Dec 2011 10:01:34 +1100
> From:[email protected]
> To:[email protected]
> Subject: Re: [OpenIndiana-discuss] OpenIndiana/ZFS mail server HA config
>
> On 6 December 2011 09:05, Hans J. Albertsson
> <[email protected]> wrote:
> > I noticed AVS: This is too recent for me to have had any chance of
learning
> > about it while at Sun.
> > Could this be used for remote mirroring between two standard Supermicro
> > X8STi-LN4 based microserver
> > using two ordinary SATA disks each?
>
> Just spitballing, but perhaps you could do something with ZFS
> send/receive. You could take frequent incremental snapshots and send
> them to the remote node. If you did this, say, every ~30-60 seconds
> during periods of high churn then perhaps all of the requisite blocks
> would still be in the ARC and you could send them without reading back
> from disk.
>
> We used to do this every 15 minutes on a pair of thumpers at the Uni I
> worked at. Has anybody done this with a shorter period? You may get
> more traction with the question on a ZFS mailing list.
>
> --
> Joshua M. Clulow
> UNIX Admin/Developer
> http://blog.sysmgr.org
>
> _______________________________________________
> OpenIndiana-discuss mailing list
> [email protected]
> http://openindiana.org/mailman/listinfo/openindiana-discuss
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