Date: Wed, 17 Aug 2016 11:02:57 +0200 From: InterNetX - Juergen Gotteswinter <juergen.gotteswinter@internetx.com> To: Borja Marcos <borjam@sarenet.es> Cc: freebsd-fs@freebsd.org Subject: Re: HAST + ZFS + NFS + CARP Message-ID: <f64b0d15-08f1-b3ac-4c44-4f4a85d3d78f@internetx.com> In-Reply-To: <1AE36A3B-A2BA-47D2-A872-1E7E9EFA201D@sarenet.es> 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> <1AE36A3B-A2BA-47D2-A872-1E7E9EFA201D@sarenet.es>
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Am 17.08.2016 um 10:53 schrieb Borja Marcos: > >> 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. in my case it was caused by rsf-1 cluster software > > 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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