Hi, I am encountering strange behaviour when trying to recover a Raid 10 LV, created with the following command: lvcreate --type raid10 -L3G -i 2 -I 256 -n lv_r10 vg_data /dev/vdb1:1-500 /dev/vdc1:1-500 /dev/vdd1:1-500 /dev/vde1:1-500 As it can be seen, I have 4 PVs and give the first 500 PE of each of them for the raid 10 logical volume. I am able to see the following PE layout: lvs -o seg_pe_ranges,lv_name,stripes -a PE Ranges LV #Str lv_r10_rimage_0:0-767 lv_r10_rimage_1:0-767 lv_r10_rimage_2:0-767 lv_r10_rimage_3:0-767 lv_r10 4 /dev/vdb1:2-385 [lv_r10_rimage_0] 1 /dev/vdc1:2-385 [lv_r10_rimage_1] 1 /dev/vdd1:2-385 [lv_r10_rimage_2] 1 /dev/vde1:2-385 [lv_r10_rimage_3] 1 /dev/vdb1:1-1 [lv_r10_rmeta_0] 1 /dev/vdc1:1-1 [lv_r10_rmeta_1] 1 /dev/vdd1:1-1 [lv_r10_rmeta_2] 1 /dev/vde1:1-1 [lv_r10_rmeta_3] 1 So far everything is OK and the number of PE is automatically reduced to 385 per PV to have the size equal to 3 Gigabytes. The problem comes when I shut down the system, replace one disk (vdc), boot again and try to recover the array. Here are the commands I execute: pvs Couldn't find device with uuid 2hU2pD-xNDa-yi1J-OkkP-NjGq-hIxo-Q5AgQC. PV VG Fmt Attr PSize PFree /dev/vdb1 vg_data lvm2 a-- 8.00g 6.49g /dev/vdd1 vg_data lvm2 a-- 8.00g 6.49g /dev/vde1 vg_data lvm2 a-- 8.00g 6.49g unknown device vg_data lvm2 a-m 8.00g 6.49g pvcreate /dev/vdc1 Physical volume "/dev/vdc1" successfully created vgextend vg_data /dev/vdc1 Couldn't find device with uuid 2hU2pD-xNDa-yi1J-OkkP-NjGq-hIxo-Q5AgQC Volume group "vg_data" successfully extended lvs -o seg_pe_ranges,lv_name,stripes -a Couldn't find device with uuid 2hU2pD-xNDa-yi1J-OkkP-NjGq-hIxo-Q5AgQC. PE Ranges LV #Str lv_r10_rimage_0:0-767 lv_r10_rimage_1:0-767 lv_r10_rimage_2:0-767 lv_r10_rimage_3:0-767 lv_r10 4 /dev/vdb1:2-385 [lv_r10_rimage_0] 1 unknown device:2-385 [lv_r10_rimage_1] 1 /dev/vdd1:2-385 [lv_r10_rimage_2] 1 /dev/vde1:2-385 [lv_r10_rimage_3] 1 /dev/vdb1:1-1 [lv_r10_rmeta_0] 1 unknown device:1-1 [lv_r10_rmeta_1] 1 /dev/vdd1:1-1 [lv_r10_rmeta_2] 1 /dev/vde1:1-1 [lv_r10_rmeta_3] 1 lvchange -ay --partial /dev/vg_data/lv_r10 PARTIAL MODE. Incomplete logical volumes will be processed. Couldn't find device with uuid 2hU2pD-xNDa-yi1J-OkkP-NjGq-hIxo-Q5AgQC lvconvert --repair vg_data/lv_r10 /dev/vdc1:1-385 Attempt to replace failed RAID images (requires full device resync)? [y/n]: y Insufficient free space: 770 extents needed, but only 345 available Failed to allocate replacement images for vg_data/lv_r10 lvconvert --repair vg_data/lv_r10 Attempt to replace failed RAID images (requires full device resync)? [y/n]: y Faulty devices in vg_data/lv_r10 successfully replaced. lvs -o seg_pe_ranges,lv_name,stripes -a Couldn't find device with uuid 2hU2pD-xNDa-yi1J-OkkP-NjGq-hIxo-Q5AgQC. PE Ranges LV #Str lv_r10_rimage_0:0-767 lv_r10_rimage_1:0-767 lv_r10_rimage_2:0-767 lv_r10_rimage_3:0-767 lv_r10 4 /dev/vdb1:2-385 [lv_r10_rimage_0] 1 /dev/vdc1:1-768 [lv_r10_rimage_1] 1 /dev/vdd1:2-385 [lv_r10_rimage_2] 1 /dev/vde1:2-385 [lv_r10_rimage_3] 1 /dev/vdb1:1-1 [lv_r10_rmeta_0] 1 /dev/vdc1:0-0 [lv_r10_rmeta_1] 1 /dev/vdd1:1-1 [lv_r10_rmeta_2] 1 /dev/vde1:1-1 [lv_r10_rmeta_3] 1 The array was recovered, but it is definitely not what I expected, because on /dev/vdc1 now 768 PEs are used instead of 385, like on the other PVs. In this case I had some extra free space on /dev/vdc1, but what if I did not? Please, suggest what should be done. Linux ubuntu1 3.13.0-32-generic, x86_64 LVM version: 2.02.98(2) (2012-10-15) Library version: 1.02.77 (2012-10-15) Driver version: 4.27.0 Pavlik Petrov _______________________________________________ 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/