[OpenIndiana-discuss] OpenIndiana/ZFS mail server HA config

[Lucas Van Tol]

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: josh at sysmgr.org
> To: openindiana-discuss at openindiana.org
> Subject: Re: [OpenIndiana-discuss] OpenIndiana/ZFS mail server HA config
> 
> On 6 December 2011 09:05, Hans J. Albertsson
> <hans.j.albertsson at branneriet.se> 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
> 
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