Date: Mon, 4 Jul 2016 14:57:10 +0200 From: Ben RUBSON <ben.rubson@gmail.com> To: freebsd-fs@freebsd.org Subject: Re: HAST + ZFS + NFS + CARP Message-ID: <D08AA9B5-317F-4E93-90C2-BA0A18E26C67@gmail.com> In-Reply-To: <577A5CE3.8060100@quip.cz> References: <20160630144546.GB99997@mordor.lan> <71b8da1e-acb2-9d4e-5d11-20695aa5274a@internetx.com> <AD42D8FD-D07B-454E-B79D-028C1EC57381@gmail.com> <20160630153747.GB5695@mordor.lan> <63C07474-BDD5-42AA-BF4A-85A0E04D3CC2@gmail.com> <678321AB-A9F7-4890-A8C7-E20DFDC69137@gmail.com> <20160630185701.GD5695@mordor.lan> <6035AB85-8E62-4F0A-9FA8-125B31A7A387@gmail.com> <20160704122527.GH41276@mordor.lan> <577A5CE3.8060100@quip.cz>
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> On 04 Jul 2016, at 14:56, Miroslav Lachman <000.fbsd@quip.cz> wrote: >=20 > Julien Cigar wrote on 07/04/2016 14:25: >=20 >> another option I had in mind is to export ZVOL through iSCSI: >> - on serverA: $> zpool create storage mirror /dev/ada1 /dev/ada2 >> - on serverB: $> zpool create storage mirror /dev/ada1 /dev/ada2 >>=20 >> create a 50G dedicated redundant storage for serverC: >> - on serverA: $> zfs create -V 50G storage/serverc >> - on serverB: $> zfs create -V 50G storage/serverc >>=20 >> iSCSI export /dev/zvol/storage/serverc from serverA and serverB and >> create a ZFS dataset on serverC: >> - on serverC: $> zpool create storage mirror /dev/ivol1 /dev/ivol2 >>=20 >> (where ivol1 is the volume from serverA and ivol2 the volume from >> serverB) >>=20 >> create, for example, a dataset for the dovecot service >> - on serverC: $> zfs create -o compress=3Dlz4 storage/dovecot >=20 > I think it will be painfully slow. ZFS on top of ZFS throught iSCSI... = too much layering, too much delays. And serverC is a SPOF.
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