From owner-freebsd-stable@freebsd.org Wed Dec 9 23:30:09 2015 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 1D40D9D61EC for ; Wed, 9 Dec 2015 23:30:09 +0000 (UTC) (envelope-from ike@michaeleichorn.com) Received: from mx1.eichornenterprises.com (mx1.eichornenterprises.com [104.236.13.122]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mx1.eichornenterprises.com", Issuer "StartCom Class 1 Primary Intermediate Server CA" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id D5FC813D3 for ; Wed, 9 Dec 2015 23:30:08 +0000 (UTC) (envelope-from ike@michaeleichorn.com) Received: from mail.eichornenterprises.com (cpe-184-59-147-149.neo.res.rr.com [184.59.147.149]) by mx1.eichornenterprises.com (OpenSMTPD) with ESMTP id 2b2d3a8d; Wed, 9 Dec 2015 18:29:59 -0500 (EST) Received: by mail.eichornenterprises.com (OpenSMTPD) with ESMTPSA id cde0a866 TLS version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO; Wed, 9 Dec 2015 18:29:58 -0500 (EST) Message-ID: <1449703798.4355.27.camel@michaeleichorn.com> Subject: Re: Periodic jobs triggering panics in 10.1 and 10.2 From: "Michael B. Eichorn" To: Michelle Sullivan , Jan Bramkamp Cc: freebsd-stable@freebsd.org Date: Wed, 09 Dec 2015 18:29:58 -0500 In-Reply-To: <5668AAB1.1080003@sorbs.net> References: <34FA7D40-8758-460D-AC14-20B21D2E3F8D@ebureau.com> <1449619470.31831.9.camel@michaeleichorn.com> <56682278.4040302@sorbs.net> <56683FC1.3050001@rlwinm.de> <5668AAB1.1080003@sorbs.net> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-Sg1TZYOYIjXZgt6TCuJg" X-Mailer: Evolution 3.18.2 Mime-Version: 1.0 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Dec 2015 23:30:09 -0000 --=-Sg1TZYOYIjXZgt6TCuJg Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2015-12-09 at 23:26 +0100, Michelle Sullivan wrote: > Jan Bramkamp wrote: > > On 09/12/15 13:45, Michelle Sullivan wrote: > > >=20 > > > No that will just hide it (if successful at all) and it won't > > > work in > > > all cases. > > >=20 > > > ... i386 is even worse for similar (not the same) instability > > > triggered > > > by the same scripts ... because zfs should not be used with the > > > stock > > > i386 kernel (which means if you're using it the whole patching > > > process > > > with freebsd-update won't work or will 'undo' your kernel > > > config.) > >=20 > > Do you have a good idea how to prevent users from shooting > > themselves > > in the foot by running ZFS on 32 Bit kernels? >=20 > Yes default not to having zfs available on any platform and allow > people > that know what they are doing to turn it on....=C2=A0=C2=A0I mean "preven= t > users > from shooting themselves in the foot" - how about by not having an > option to install a zfs root on the default install disks? >=20 > >=20 > > > Personally I think zfs should be optional only for 'advanced' > > > users and > > > come with a whole host of warnings about what it is not suitable > > > for.... > > > however, it seems to be treated as a magic bullet for data > > > corruption > > > issues yet all I have seen is an ever growing list of where it > > > causes > > > problems.. when did UFS become an unreliable FS that is > > > susceptible to > > > chronic data corruption? > >=20 > > As storage capacity grew a lot faster than reliability. >=20 > Yeah, that's why we have these multi-tes-of-terrabyte laptops that > must > have a zfs root install... >=20 > >=20 > > UFS is a good file system for its time, but it trusts hardware > > absolutely. Modern hardware doesn't deserve this level of trust. >=20 > Ok at this point we have to question things... >=20 > Does your average home machine need zfs?=C2=A0=C2=A0(because windows does= n't) > ... > does your average laptop require zfs (or even benefit) ...?=C2=A0=C2=A0= =C2=A0In fact > when I look at it, I'm running=C2=A0=C2=A070+ servers and a few desktops = and > I'm > running 5 of them with zfs...=C2=A0=C2=A02 of them absolutely need it, 2 = of > them > are solaris (which probably doesn't count and certainly doesn't have > relevance to FreeBSD) the other is a 2005 P4 based server that is > completely unusable because zfs on i386 doesn't work with the stock > kernel....=C2=A0=C2=A0and guess what ... it has 73G 15k SCSI Server drive= s in > it > so it probably has reliable hardware that doesn't suffer from "Modern > hardware doesn't deserve this level of trust" >=20 > > ZFS detects and recovers without dataloss from most errors caused > > by > > the limited hardware reliability. >=20 > Currently I've had more problems with the reliability of zfs in > FreeBSD > than reliability of hardware..=C2=A0=C2=A0I do get your point though... >=20 > >=20 > > ZFS isn't just a tool to deal with hardware limitations it's also a > > convenience I no longer want to give up. Snapshots and replication > > streams simplify backups and a background scrub once a week (or > > month) > > sure beats waiting for fsck. > Now this is the one set of reasons I can really appreciate and had it > been the opening argument I'd have understood your position, but it > seems this is a side note to the above and the above is where I see > it's > completely useless...=C2=A0=C2=A0When ZFS was first developed a friend an= d I in > Sun had lots of fun setting up servers where we just chucked any old > drives we could lay our hands on into a pool ... this we found very > cool > and this was where 'unreliable' hardware was an understatement - the > drives were pulled from machines because SMART (and other tools) were > reporting the drive(s) failing..... but it was a work around for bad > sectors etc... >=20 > Seriously though the default to install with zfs and root on zfs is a > really bad idea - the people who know how not to shoot themselves in > the > foot are those people that don't need a selectable option in the > install > because they know how to configure it... they're the people who will > probably be in every manual and advanced option they can find anyhow > (or > just using boot servers and predefined install scripts)....!! >=20 > Regards, >=20 I sorry, but I really don't get your point, PCBSD has shown a great reason why zfs on root and on laptops/desktops is a good idea... boot environments. They have pretty much figured out how to use snapshots to go from A-B ping-pong installations to A-B-C-D-E.... installations. I am even aware of people using it to run Release and Current on the same machine. Unfortunately at the moment the system requires GRUB, but there is ongoing work to add the ability to the FreeBSD bootloader. Further IIRC zfs send-receive has a history involving a developer who wanted a better rsync for transfering his work to a laptop. In addition we have pretty much Moore's Lawed our way to the point where a new laptop today can out spec a typical server from when ZFS was first implemented. 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