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Date: Fri, 3 Jun 2016 13:36:26 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: "Eugene M. Zheganin" <emz@norma.perm.ru>
Cc: stable@freebsd.org
Subject: Re: HAST, zfs and local mirroring
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On Fri, Jun 03, 2016 at 02:05:07PM +0500, Eugene M. Zheganin wrote:

> Hi,
> 
> On 02.06.16 19:50, Slawa Olhovchenkov wrote:
> >
> > I am suggesting next setup:
> >
> > node0:
> >   own pool zroot0: mirror-0: local_disk0
> >       	   	   	     remote-iscsi_disk1/1
> >   local_disk1: exported by iscsi as remote-iscsi_disk0/1 to node1
> >
> > node1:
> >   own pool zroot1: mirror-0: local_disk0
> >       	   	   	     remote-iscsi_disk0/1
> >   local_disk1: exported by iscsi as remote-iscsi_disk1/1 to node0
> You message lead me to a though that I could use iSCSI to replicate the
> zfs pool from node1 to both iSCSI-provided disk on a node2 in a 4-way
> mirror, right ? Are there any obvious obstacles to this, that I don't
> see, considering the bandwith will be enough ?

No, just regular mirror.
And yes, two independed pool.
10G link prefered. 1G link acts like old HDD, about 70MB/s transfer.
Every transit switch degrade performance.