Date: Wed, 17 Aug 2016 10:53:17 +0200 From: Borja Marcos <borjam@sarenet.es> To: juergen.gotteswinter@internetx.com Cc: freebsd-fs@freebsd.org Subject: Re: HAST + ZFS + NFS + CARP Message-ID: <1AE36A3B-A2BA-47D2-A872-1E7E9EFA201D@sarenet.es> In-Reply-To: <472bc879-977f-8c4c-c91a-84cc61efcd86@internetx.com> References: <6035AB85-8E62-4F0A-9FA8-125B31A7A387@gmail.com> <20160703192945.GE41276@mordor.lan> <20160703214723.GF41276@mordor.lan> <65906F84-CFFC-40E9-8236-56AFB6BE2DE1@ixsystems.com> <B48FB28E-30FA-477F-810E-DF4F575F5063@gmail.com> <61283600-A41A-4A8A-92F9-7FAFF54DD175@ixsystems.com> <20160704183643.GI41276@mordor.lan> <AE372BF0-02BE-4BF3-9073-A05DB4E7FE34@ixsystems.com> <20160704193131.GJ41276@mordor.lan> <E7D42341-D324-41C7-B03A-2420DA7A7952@sarenet.es> <20160811091016.GI70364@mordor.lan> <1AA52221-9B04-4CF6-97A3-D2C2B330B7F9@sarenet.es> <472bc879-977f-8c4c-c91a-84cc61efcd86@internetx.com>
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> On 17 Aug 2016, at 09:25, InterNetX - Juergen Gotteswinter <juergen.gotteswinter@internetx.com> wrote: > try dual split import :D i mean, zpool -f import on 2 machines hooked up > to the same disk chassis. > > kaboom, really ugly kaboom. thats what is very likely to happen sooner > or later especially when it comes to homegrown automatism solutions. > even the commercial parts where much more time/work goes into such > solutions fail in a regular manner Well, don’t expect to father children after shooting your balls! ;) I am not a big fan of such closely coupled solutions. There are quite some failure modes that can break such a configuration, not just a brainless “dual split import” as you say :) Misbehaving software (read, a ZFS bug) can render the pool unusable and, no matter how many redundant servers you have connected to your chassis, you are toast. Using incremental replication over a network is much more robust, and it offers a lot of fault isolation. Moreover, you can place the servers in different buildings, etc. Networks even offer a more than reasonable protection from electrical problems. Especially if you get paranoid and use fiber, in which case protection is absolute. Borja.
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