HAST + ZFS + NFS + CARP

[Ben RUBSON]

> On 04 Jul 2016, at 14:56, Miroslav Lachman <000.fbsd at quip.cz> wrote:
> 
> Julien Cigar wrote on 07/04/2016 14:25:
> 
>> 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
>> 
>> create a 50G dedicated redundant storage for serverC:
>> - on serverA: $> zfs create -V 50G storage/serverc
>> - on serverB: $> zfs create -V 50G storage/serverc
>> 
>> 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
>> 
>> (where ivol1 is the volume from serverA and ivol2 the volume from
>> serverB)
>> 
>> create, for example, a dataset for the dovecot service
>> - on serverC: $> zfs create -o compress=lz4 storage/dovecot
> 
> 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.