Hi, I need some help with a strange lvm problem: I want to put LVM on a Linux Raid-1 device. I already did this several times successfully. But this time I have a strange problem: The raid device is /dev/md3, and it should consist of the two partitions /dev/hda3 and /dev/hdc3. I created the raid device with just /dev/hdc3, second missing, then pvcreate /dev/md3 and created the volume group 'raid'. Works well. pvscan correctly shows the raid device instead of /dev/hdc3: sodom# pvscan PV /dev/hdc4 VG nord lvm2 [58,59 GB / 33,59 GB free] PV /dev/md3 VG raid lvm2 [54,35 GB / 21,35 GB free] Total: 2 [112,94 GB] / in use: 2 [112,94 GB] / in no VG: 0 [0 ] (ignore hdc4, it is just another lvm because hdc is larger than hda, there is no problem with hdc4) But as soon as I add /dev/hda3 to the raid system (mdad /dev/md3 -a /dev/hda3), lvm confuses the partitions. It does not detect /dev/md3 anymore and complains that there are two different partitions with the same ID: sodom# pvscan Found duplicate PV 39jeBxsxpKtJrwP6FN3Yvq6zB7khU6Pa: using /dev/hdc3 not /dev/hda3 PV /dev/hdc4 VG nord lvm2 [58,59 GB / 33,59 GB free] PV /dev/hda3 VG raid lvm2 [54,35 GB / 21,35 GB free] Total: 2 [112,94 GB] / in use: 2 [112,94 GB] / in no VG: 0 [0 ] The volume group can't then be used. As soon as I take out /dev/hda3 and wipe the first sectors, everything is ok again. Any idea what's going wrong here? Just in case it matters, the partition tables: sodom# sfdisk -l /dev/hda Disk /dev/hda: 116301 cylinders, 16 heads, 63 sectors/track Warning: The partition table looks like it was made for C/H/S=*/255/63 (instead of 116301/16/63). For this listing I'll assume that geometry. Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0 Device Boot Start End #cyls #blocks Id System /dev/hda1 0+ 100 101- 811251 fd Linux raid autodetect /dev/hda2 101 201 101 811282+ fd Linux raid autodetect /dev/hda3 202 7296 7095 56990587+ fd Linux raid autodetect /dev/hda4 0 - 0 0 0 Empty sodom# sfdisk -l /dev/hdc Disk /dev/hdc: 238216 cylinders, 16 heads, 63 sectors/track Warning: The partition table looks like it was made for C/H/S=*/255/63 (instead of 238216/16/63). For this listing I'll assume that geometry. Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0 Device Boot Start End #cyls #blocks Id System /dev/hdc1 0+ 100 101- 811251 fd Linux raid autodetect /dev/hdc2 101 201 101 811282+ fd Linux raid autodetect /dev/hdc3 202 7296 7095 56990587+ fd Linux raid autodetect /dev/hdc4 7297 14945 7649 61440592+ 8e Linux LVM regards Hadmut _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
