Molle Bestefich <molle.bestefich <at> gmail.com> writes: > My best guess is that it's OK and you won't loose data if you run > --zero-superblock on /dev/sd[abcd] and then create an array on > /dev/sd[abcd]1, but I do find it odd that it suddenly can't find > superblocks on /dev/sd[abcd]1. OK, I tried several things and then I had enough and I did the creating part: It worked! ,----[ Creating the raid ] | root@ned ~ # mdadm --create -n 4 -l 5 /dev/md0 missing /dev/sdb1\ | /dev/sdc1 /dev/sdd1 | mdadm: /dev/sdb1 appears to be part of a raid array: | level=raid5 devices=4 ctime=Sun Jan 29 21:35:05 2006 | mdadm: /dev/sdc1 appears to be part of a raid array: | level=raid5 devices=4 ctime=Sun Jan 29 21:35:05 2006 | mdadm: /dev/sdd1 appears to be part of a raid array: | level=raid5 devices=4 ctime=Sun Jan 29 21:35:05 2006 | Continue creating array? y | mdadm: array /dev/md0 started. | root@ned ~ # date;cat /proc/mdstat | Fri Jul 14 18:51:48 CEST 2006 | Personalities : [linear] [raid0] [raid1] [raid10] [raid5] [raid4]\ | [raid6] [multipath] | md0 : active raid5 sdd1[3] sdc1[2] sdb1[1] | 732443136 blocks level 5, 64k chunk, algorithm 2 [4/3] [_UUU] | | unused devices: <none> | root@ned ~ # `---- ,---- | root@ned ~ # Start lvm | Setting up LVM Volume Groups... | Reading all physical volumes. This may take a while... | Found volume group "datavg1" using metadata type lvm2 | 1 logical volume(s) in volume group "datavg1" now active | root@ned ~ # mount /dev/datavg1/datalv1 /data -o ro -t xfs | root@ned ~ # mount | rootfs on / type rootfs (rw) | /dev/root on / type ext3 (rw,data=ordered) | proc on /proc type proc (rw) | sysfs on /sys type sysfs (rw) | /dev/root on /dev/.static/dev type ext3 (rw,data=ordered) | tmpfs on /dev type tmpfs (rw) | /dev/pts on /dev/pts type devpts (rw) | tmpfs on /dev/shm type tmpfs (rw) | /dev/datavg1/datalv1 on /data type xfs (ro,sunit=128,swidth=25165824) | root@ned ~ # `---- OK, the thing works degraded. I unmounted it and did some file system checking: ,---- | root@ned ~ # xfs_repair /dev/datavg1/datalv1 | [...] | done | xfs_repair /dev/datavg1/datalv1 70.19s user 25.42s system\ | 18% cpu 8:25.58 total | root@ned ~ # mount /dev/datavg1/datalv1 /data -o ro -t xfs | root@ned ~ # `---- No problems were found and the read-only mount afterwards worked. Now I am doing backups *g* Thank you for your help! Next steps: * After backups, I add the 4th disk * Praying that the raid runs without problems from now on - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
