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To: freebsd-stable@freebsd.org, freebsd-fs@freebsd.org, "Maurizio Vairani"
 <maurizio.vairani@cloverinformatica.it>
Subject: Re: Shutdown problem with an USB memory stick as ZFS cache device
References: <51E6555D.2080803@cloverinformatica.it>
Date: Wed, 17 Jul 2013 11:50:22 +0200
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From: "Ronald Klop" <ronald-freebsd8@klop.yi.org>
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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.