Date: Wed, 18 Nov 2009 07:50:47 -0600 From: Robert Noland <rnoland@FreeBSD.org> To: Emil Smolenski <ambsd@raisa.eu.org> Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org Subject: Re: Boot with ZFS on single disk: "ZFS: i/o error - all block copies unavailable" [was: Re: GPT boot with ZFS RAIDZ "ZFS: i/o error - all block copies unavailable"] Message-ID: <1258552247.2303.75.camel@balrog.2hip.net> In-Reply-To: <op.u3kdq613qvde5b@bolt.zol> References: <op.u3hw9wl0qvde5b@am-laptop.local.org> <1258390784.2303.42.camel@balrog.2hip.net> <op.u3h252qaqvde5b@bolt.zol> <op.u3j6m8w5qvde5b@bolt.zol> <1258497221.2303.66.camel@balrog.2hip.net> <op.u3kdq613qvde5b@bolt.zol>
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On Wed, 2009-11-18 at 01:17 +0100, Emil Smolenski wrote: > On Tue, 17 Nov 2009 23:33:41 +0100, Robert Noland <rnoland@freebsd.org> > wrote: > > >> Should I file a PR? I would > >> like to help in debugging it (however my skills in low-level C aren't > >> strong enough to do it on my own). > > > Ok, the first thing I would like to see is "zdb -uuu". > > # zdb -uuu pgpool > Segmentation fault: 11 (core dumped) Ok, this is disturbing... It works fine for me on -CURRENT / amd64 and reports the root block pointer, which is what we need to locate the MOS. robert. > # zdb > pgpool > version=13 > name='pgpool' > state=0 > txg=439808 > pool_guid=3920915583055727184 > hostid=1642959122 > hostname='unset' > vdev_tree > type='root' > id=0 > guid=3920915583055727184 > children[0] > type='disk' > id=0 > guid=5859773264564918193 > path='/dev/da0' > whole_disk=0 > metaslab_array=23 > metaslab_shift=35 > ashift=9 > asize=4500799356928 > is_log=0 > DTL=260 > > > I don't see an > > obvious issue with single disk reads. My own setup uses 2 x 1TB > > currently. Failing to read the MOS is basically the first read attempt > > from the pool, in fact it is the read that attempts to mount the pool. > -- Robert Noland <rnoland@FreeBSD.org> FreeBSD
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