Date: Fri, 3 Jun 2016 13:17:05 +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 Message-ID: <20160603101705.GD75625@zxy.spb.ru> In-Reply-To: <57514296.7090906@norma.perm.ru> References: <bf4a004f-8c7f-1e2e-0c31-3de266975ae4@norma.perm.ru> <20160601132300.GA75625@zxy.spb.ru> <574FDC63.6090100@norma.perm.ru> <20160602145028.GC75625@zxy.spb.ru> <57514296.7090906@norma.perm.ru>
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On Fri, Jun 03, 2016 at 01:40:54PM +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 > > > > > > No HAST. > > Disks synced by ZFS over iSCSI. > But this way I will get two independent zfs pools (or I still didn't get > it), one half of each will be stored on another machine. Yes. > And I need > something different - a continuously replicated disk resource, that > would be available on both machines in case either will crash. I think this is imposible. All modern FS (cluster also) believe exclusive modifivation of on-disk data. Cluster FS just acts as services (but still believe exclusive access to HDD) > Cluster > filesystem would be fine, but as far as I know there's no such thing on > FreeBSD, so I accept it will be unavailable on slave while mounted as > read-write on the master. HAST looks like a thing thats fits my > requirement, only that I wank it to be redundant inside each host too, > and all the documentation shows examples without local redundancy. You can't touch local HDD HASTed to remote.
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