Date: Sun, 27 Jan 2008 15:24:18 +0200 From: Danny Braniss <danny@cs.huji.ac.il> To: Ivan Voras <ivoras@freebsd.org> Cc: freebsd-stable@freebsd.org Subject: Re: "ad0: TIMEOUT - WRITE_DMA" type errors with 7.0-RC1 Message-ID: <E1JJ7Ug-00004s-CH@cs1.cs.huji.ac.il> In-Reply-To: <fng55e$pk7$2@ger.gmane.org> References: <479A0731.6020405@skyrush.com> <20080125162940.GA38494@eos.sc1.parodius.com> <479A3764.6050800@skyrush.com> <3803988D-8D18-4E89-92EA-19BF62FD2395@mac.com> <479A4CB0.5080206@skyrush.com> <20080126003845.GA52183@eos.sc1.parodius.com> <20080126010054.GA52891@eos.sc1.parodius.com> <20080126010653.GA53255@eos.sc1.parodius.com> <479A8A24.5050409@skyrush.com> <20080126012557.GB53400@eos.sc1.parodius.com> <479B1172.4050706@restart.be> <fng55e$pk7$2@ger.gmane.org>
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> Henri Hennebert wrote: > > Jeremy Chadwick wrote: > >> On Fri, Jan 25, 2008 at 06:17:24PM -0700, Joe Peterson wrote: > >>> Glad you got it back! Yes, when I was first playing with ZFS, I noti= > ced > >>> that booting between single and multi user mode could make the pools > >>> "invisible". Import seemed to bring them back... > >> > >> I did go into single-user mode and attempt to do ZFS-related commands,= > > >> which might explain the "no datasets available" once I was back in > >> multiuser! I would classify that as a bug, and one which is going to > >> cause all sorts of hair-pulling for administrators in the future. I > >> wonder what it's caused by. > >=20 > > In single user / is read only and so /boot/zfs/zpool.cache can't be=20 > > created/updated > > But it's still readable. The issue is that hostid isn't set (by=20 > /etc/rc.d/hostid). if the root is read only, as the case of diskless/dataless boot, it's the fact that /boot/zfs/zpool.cache cannot be used which causes the problem, so adding zpool import -a solves the issue. danny
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