2010/4/1 Bartosz Stec <bartosz.stec_at_it4pro.pl>: > Hello ZFS and GPT hackers :) > > I'm sending this message to both freebsd-current and freebsd-fs because it > doesn't seems to be a CURRENT-specific issue. > > Yesterday I tried to migrate my mixed UFS/RAIDZ config to clean RAIDZ with > GPT boot. I've following mostly this guide: > http://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/RAIDZ1 > I'm using CURRENT on 3x40GB HDDs (ad0-ad3) and additional 250GB HDD has been > used for data migration (ad4). > > Data was copied form RAIDZ to 250GB HDD, GPT sheme was created on 40GB > HDDs, then new zpool on them, and finally data went back to RAIDZ. Booting > from RAIDZ was succesful, so far so good. > > After a while I've noticed some SMART errors on ad1, so I've booted machine > with seatools for dos and made long test. One bad sector was found and > reallocated, nothing to worry about. > As I was in seatools already, I've decided to adjust LBA size on that disk > (seatools can do that), because it was about 30MB larger than the other two, > and because of that I had to adjust size of freebsd-zfs partition on that > disk to match exact size of others (otherwise 'zpool create' will complain). > So LBA was adjusted and system rebooted. > > Yes, I was aware that changing disk size probably end with corrupted GPT and > data loss, but it doesn't seem to be a big deal for me as far as 2/3 of > zpool is alive, because I can always recreate gpt and resilver ad1. > > Unfortunately it wasn't so easy. First of all system booted, and as I > expected kernel message shows GPT error on ad1. Zpool was degraded but alive > and kicking. However, when I tried to execute any gpart command on ad1, it > return: > > ad1: no such geom Are you sure you created a partition scheme with gpart on ad1 before issuing partition-related gpart commands ? > > ad1 was present under /dev, and it could be accessed by sysinstall/fdisk, > but no with gpart. I've created bsd slice with sysinstall on ad1 and > rebooted, with hope that after reboot I could acces ad1 with gpart and > recreate GPT scheme. Another surprise - system didn't boot at all, rebooting > after couple of seconds in loader (changing boot device didn't make a > difference). > > Only way I could boot system at this moment was connecting 250GB HDD which > fortunately still had data from zpool migration and boot from it. Another > surprise - kernel was still complaining about GPT corruption on ad1. I had > no other ideas so I ran > > dd if=/dev/zero of=/dev/ad1 bs=512 count=512 > > to clear beginning of the hdd. After that disk was still unaccesible fromt > gpart, so I tried sysinstall/fdisk againt to create standard BSD > partitioning scheme and rebooted system. > After that finally gpart started to talk with ad1 and GPT scheme and zpool > has been recreated and work as it supposed to. > > Still, how can we clear broken GPT data after it got corrupted? > Why gpart has been showing "ad1: no such geom", and how can we deal with > this problem? > Finally, why gptzfsboot failed with GPT corrupted on other disk after trying > to fix it, while it booted at first place? > > Or maybe changing LBA size of already partitioned HDD is extreme case, and > the only way these problems could be triggered ;)? > > Cheers! > > -- > Bartosz Stec > > > _______________________________________________ > freebsd-fs_at_freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe_at_freebsd.org" > -- Olivier Smedts _ ASCII ribbon campaign ( ) e-mail: olivier_at_gid0.org - against HTML email & vCards X www: http://www.gid0.org - against proprietary attachments / \ "Il y a seulement 10 sortes de gens dans le monde : ceux qui comprennent le binaire, et ceux qui ne le comprennent pas."Received on Thu Apr 01 2010 - 14:36:47 UTC
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