Date: Fri, 1 Jul 2016 11:42:13 +0200 From: InterNetX - Juergen Gotteswinter <jg@internetx.com> To: Julien Cigar <julien@perdition.city>, Ben RUBSON <ben.rubson@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: HAST + ZFS + NFS + CARP Message-ID: <47c7e1a5-6ae8-689c-9c2d-bb92f659ea43@internetx.com> In-Reply-To: <20160701084717.GE5695@mordor.lan> 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> <20160630163541.GC5695@mordor.lan> <50BF1AEF-3ECC-4C30-B8E1-678E02735BB5@gmail.com> <20160701084717.GE5695@mordor.lan>
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>
> Thank you very much for those "advices", it is much appreciated!
>
> I'll definitively go with iSCSI (for which I haven't that much
> experience) over HAST.
good luck, i rather cut one of my fingers than using something like this
in production. but its probably a quick way if one targets to find a new
opportunity ;)
>
> Maybe a stupid question but, assuming on the MASTER with ada{0,1} the
> local disks and da{0,1} the exported iSCSI disks from the SLAVE, would
> you go with:
>
> $> zpool create storage mirror /dev/ada0s1 /dev/ada1s1 mirror /dev/da0
> /dev/da1
>
> or rather:
>
> $> zpool create storage mirror /dev/ada0s1 /dev/da0 mirror /dev/ada1s1
> /dev/da1
>
> I guess the former is better, but it's just to be sure .. (or maybe it's
> better to iSCSI export a ZVOL from the SLAVE?)
>
are you really sure you understand what you trying to do? even if its
currently so, i bet in a desaster case you will be lost.
> Correct me if I'm wrong but, from a safety point of view this setup is
> also the safest as you'll get the "fullsync" equivalent mode of HAST
> (but but it's also the slowest), so I can be 99,99% confident that the
> pool on the SLAVE will never be corrupted, even in the case where the
> MASTER suddently die (power outage, etc), and that a zpool import -f
> storage will always work?
99,99% ? optimistic, very optimistic.
we are playing with recovery of a test pool which has been imported on
two nodes at the same time. looks pretty messy
>
> One last thing: this "storage" pool will be exported through NFS on the
> clients, and when a failover occur they should, in theory, not notice
> it. I know that it's pretty hypothetical but I wondered if pfsync could
> play a role in this area (active connections)..?
>
they will notice, and they will stuck or worse (reboot)
> Thanks!
> Julien
>
>>
>>>>>> ZFS would then know as soon as a disk is failing.
>>>>>> And if the master fails, you only have to import (-f certainly, in case of a master power failure) on the slave.
>>>>>>
>>>>>> Ben
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>
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