Date: Thu, 18 Jul 2013 09:52:13 +0200 From: Maurizio Vairani <maurizio.vairani@cloverinformatica.it> To: "Julian H. Stacey" <jhs@berklix.com> Cc: freebsd-fs@freebsd.org, freebsd-stable@freebsd.org, Ronald Klop <ronald-freebsd8@klop.yi.org> Subject: Re: [SOLVED] Re: Shutdown problem with an USB memory stick as ZFS cache device Message-ID: <51E79EAD.5040602@cloverinformatica.it> In-Reply-To: <201307171529.r6HFT4EK063849@fire.js.berklix.net> References: <201307171529.r6HFT4EK063849@fire.js.berklix.net>
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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
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