Date: Mon, 26 Aug 2013 11:49:30 +0200 From: Maurizio Vairani <maurizio.vairani@cloverinformatica.it> To: Ronald Klop <ronald-freebsd8@klop.yi.org> Cc: freebsd-fs@freebsd.org, freebsd-stable@freebsd.org Subject: Re: [SOLVED] Re: Shutdown problem with an USB memory stick as ZFS cache device Message-ID: <521B24AA.50200@cloverinformatica.it> In-Reply-To: <op.w0p4esig8527sy@ronaldradial.versatec.local> References: <201307171529.r6HFT4EK063849@fire.js.berklix.net> <51E79EAD.5040602@cloverinformatica.it> <op.w0p4esig8527sy@ronaldradial.versatec.local>
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On 24/07/2013 13.19, Ronald Klop wrote: > On Thu, 18 Jul 2013 09:52:13 +0200, Maurizio Vairani > <maurizio.vairani@cloverinformatica.it> wrote: > >> On 17/07/2013 17:29, Julian H. Stacey wrote: >>> Maurizio Vairani wrote: >>>> On 17/07/2013 11:50, Ronald Klop wrote: >>>>> On Wed, 17 Jul 2013 10:27:09 +0200, Maurizio Vairani >>>>> <maurizio.vairani@cloverinformatica.it> wrote: >>>>> >>>>>> Hi all, >>>>>> >>>>>> >>>>>> on a Compaq Presario laptop I have just installed the latest stable >>>>>> >>>>>> >>>>>> #uname -a >>>>>> >>>>>> FreeBSD presario 9.2-PRERELEASE FreeBSD 9.2-PRERELEASE #0: Tue >>>>>> Jul 16 >>>>>> 16:32:39 CEST 2013 >>>>>> root@presario:/usr/obj/usr/src/sys/GENERIC amd64 >>>>>> >>>>>> >>>>>> For speed up the compilation I have added to the pool, tank0, a >>>>>> SanDisk memory stick as cache device with the command: >>>>>> >>>>>> >>>>>> # zpool add tank0 cache /dev/da0 >>>>>> >>>>>> >>>>>> But when I shutdown the laptop the process will halt with this >>>>>> screen >>>>>> shot: >>>>>> >>>>>> >>>>>> http://www.dump-it.fr/freebsd-screen-shot/2f9169f18c7c77e52e873580f9c2d4bf.jpg.html >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> and I need to press the power button for more than 4 seconds to >>>>>> switch off the laptop. >>>>>> >>>>>> The problem is always reproducible. >>>>> Does sysctl hw.usb.no_shutdown_wait=1 help? >>>>> >>>>> Ronald. >>>> Thank you Ronald it works ! >>>> >>>> In /boot/loader.conf added the line >>>> hw.usb.no_shutdown_wait=1 >>>> >>>> Maurizio >>> I wonder (from ignorance as I dont use ZFS yet), >>> if that merely masks the symptom or cures the fault ? >>> >>> Presumably one should use a ZFS command to disassociate whatever >>> might have the cache open ? (in case something might need to be >>> written out from cache, if it was a writeable cache ?) >>> >>> I too had a USB shutdown problem (non ZFS, now solved)& several people >>> made useful comments on shutdown scripts etc, so I'm cross referencing: >>> >>> http://lists.freebsd.org/pipermail/freebsd-mobile/2013-July/012803.html >>> >>> Cheers, >>> Julian >> Probably it masks the symptom. Andriy Gapon hypothesizes a bug in the >> ZFS clean up code: >> http://lists.freebsd.org/pipermail/freebsd-fs/2013-July/017857.html >> >> Surely one can use a startup script with the command: >> zpool add tank0 cache /dev/da0 >> and a shutdown script with: >> zpool remove tank0 /dev/da0 >> but this mask the symptom too. >> >> I prefer the Ronald solution because: >> - is simpler: it adds only one line (hw.usb.no_shutdown_wait=1) to >> one file (/boot/loader.conf). >> - is fastest: the zpool add/remove commands take time and >> “hw.usb.no_shutdown_wait=1” in /boot/loader.conf speeds up the >> shutdown process. >> - is cleaner: the zpool add/remove commands pair will fill up the >> tank0 pool history. >> >> Regards >> Maurizio > > Keep an eye on this commit when it is merged to 9-stable. > http://svnweb.freebsd.org/changeset/base/253606 > It might be the fix of the problem. > > Ronald. It works ! Just upgraded the laptop to r254783. Shutdown and reboot works fine, regardless of the hw.usb.no_shutdown_wait value. Thanks Maurizio
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