I went and did a silly thing. I had a 200 gig disk with a jfs filesystem and a duplicate (dd'd from one to the other). Then I decided I wanted to create a raid1 array from the two disks, so I did the following:
# mdadm --create /dev/md1 --auto=yes --level=1 --raid-devices=2 /dev/hdm1 /dev/hdp1 and was subsequently able to mount and read (or seem to) the pre-existing data, but when I rebooted, I got an error from fsck.jfs, which I can replicate verbosely as follows: # fsck -v /dev/md1 fsck 1.37 (21-Mar-2005) fsck.jfs version 1.1.7, 22-Jul-2004 processing started: 5/31/2005 22.52.14 FSCK Device /dev/md1 is currently mounted READ ONLY. Using default parameter: -p The current device is: /dev/md1 Open(...READ/WRITE EXCLUSIVE...) returned rc = 0 Incorrect jlog length detected in the superblock (P). Incorrect jlog length detected in the superblock (S). Superblock is corrupt and cannot be repaired since both primary and secondary copies are corrupt. CANNOT CONTINUE. Now, I didn't really expect this to work and I have a backup of the data, but I wonder if this is reparable in-place with the proper jfs_debugfs incantation (or similar). I haven't made any modifications to the raid1 device /dev/md1 except mounting/umounting it read/write briefly. The /dev/md1 device is 193 sectors smaller than the underlying partition /dev/hd?1. Comparing the md5sums of the first 200 sectors of /dev/md1 and /dev/hd?1, they are identical so perhaps the smaller number of sectors is reflected at the tail. The jfs superblock appears to be present, it is just reporting a different fs size than the raid1 device. This is on a debian/testing box, with a custom-built 2.6.11.11 kernel. Thanks for any ideas/guidance! -- Russell Senior ``I have nine fingers; you have ten.'' [EMAIL PROTECTED] ------------------------------------------------------- This SF.Net email is sponsored by Yahoo. Introducing Yahoo! Search Developer Network - Create apps using Yahoo! Search APIs Find out how you can build Yahoo! directly into your own Applications - visit http://developer.yahoo.net/?fr=offad-ysdn-ostg-q22005 _______________________________________________ Jfs-discussion mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/jfs-discussion
