Date: Wed, 3 Jul 2013 17:04:05 -0700 From: Jeremy Chadwick <jdc@koitsu.org> To: mxb <mxb@alumni.chalmers.se> Cc: freebsd-fs@freebsd.org Subject: Re: Slow resilvering with mirrored ZIL Message-ID: <20130704000405.GA75529@icarus.home.lan> In-Reply-To: <CBCA1716-A3EC-4E3B-AE0A-3C8028F6AACF@alumni.chalmers.se> References: <CABBFC07-68C2-4F43-9AFC-920D8C34282E@unixconn.com> <51D42107.1050107@digsys.bg> <2EF46A8C-6908-4160-BF99-EC610B3EA771@alumni.chalmers.se> <51D437E2.4060101@digsys.bg> <E5CCC8F551CA4627A3C7376AD63A83CC@multiplay.co.uk> <CBCA1716-A3EC-4E3B-AE0A-3C8028F6AACF@alumni.chalmers.se>
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On Wed, Jul 03, 2013 at 05:12:17PM +0200, mxb wrote: > > Not sure if new are 4k. Done nothing about that. > But the SECOND drive, resilvering is SLOW. Not the first one. > > As stated below. Those changes are introduced to the system. > ALL new driver ARE identical, except S/N of cause :) > > On 3 jul 2013, at 16:55, Steven Hartland <killing@multiplay.co.uk> wrote: > > > > > ----- Original Message ----- From: "Daniel Kalchev" <daniel@digsys.bg> > > To: "mxb" <mxb@alumni.chalmers.se> > > Cc: <freebsd-fs@freebsd.org> > > Sent: Wednesday, July 03, 2013 3:40 PM > > Subject: Re: Slow resilvering with mirrored ZIL > > > > > >> On 03.07.13 16:36, mxb wrote: > >>> Well, then my question persists - why I get so significant drop of speed while resilvering second drive. > >>> The only changes to the system are: > >>> > >>> 1. Second partition for ZIL to create a mirror > >>> 2. New disks are 7200rpm. old ones are 5400rpm. > >>> > > > > Its not something like the old disks are 512byte sectors > > where as the new ones are 4k? > > > > It this is the case having already replaced one disk you've > > killed performance as its having to do lots more work reading > > none 4k aligned data? Not enough hard information to diagnose. What's needed is below; you can XXX out system names if you want, but please do not XXX out anything else. - Output from: dmesg - Output from: zpool status - Output from: zpool get all - Output from: zfs get all - Output from: "gpart show -p" for every disk on the system - Output from: cat /etc/sysctl.conf - Output from: cat /boot/loader.conf - Output from: "smartctl -a" for every disk that's used by ZFS (please use smartmontools 6.1 or newer in this case; install ports/sysutils/smartmontools) I can think of one tunable related to resilvering that may/might help with your problem, but I'm not going to mention it until the above can be provided. -- | Jeremy Chadwick jdc@koitsu.org | | UNIX Systems Administrator http://jdc.koitsu.org/ | | Making life hard for others since 1977. PGP 4BD6C0CB |
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