Date: Wed, 8 Dec 2010 03:28:27 +1100 From: Geoff Roberts <geoff@apro.com.au> To: freebsd-questions@freebsd.org Subject: Re: zpool won't mount as dataset stuck Message-ID: <201012080328.27769.geoff@apro.com.au> In-Reply-To: <20101128163048.21211cl7o3xpi8lc@aprosrv2.apro.com.au> References: <20101128163048.21211cl7o3xpi8lc@aprosrv2.apro.com.au>
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Hi, On Sun, 28 Nov 2010 04:30:48 pm Geoff Roberts wrote: > Long and short is I can see the "tank" zpool without a problem, but > whenever I try to import it the disk light flashes every second and > the datasets won't mount. > > I can run a history command on "tank" and that shows the following > repeated every second (tgx keeps incrementing by one): > > 2010-11-28.15:08:33 [internal rollback txg:9645688] dataset = 222 > [user root on systemname.com] > 2010-11-28.15:08:34 [internal rollback txg:9645689] dataset = 222 > [user root on systemname.com] Just for reference, I was able to use the steps below to recover the data of the zpool that was "stuck". The steps below were done using virtual machines. The zpool history command was a great help as well. a) Created a FreeBSD 9.0 system and applied a ZFS v28 patch for a few features that looked useful for my problem. i) Ability to mount zpool in readonly ii) Ability to mount zpool with -N (do not mount datasets) iii) Ability to mount zpool with -T to specify a particular transaction set. In the end I didn't need this feature. b) Took an image of one of the mirror partitions housing the zpool using dd and transferred that to a file on a stand UFS2 file system. This was so I could work on a copy and transfer the data on an external hard disk to the FreeBSD 9.0 virtual machine. c) Used mdconfig to mount the file image on the FreeBSD 9.0 system. d) I was able to use zpool import -o readonly=on -N poolname The readonly option in particular seemed to stop the last transaction continually attempting to run in an endless loop. e) I could then see the datasets. From here I was able to mount them and recover all the data. Geoff
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