Good day, I am testing LVM on some test hardware and I'm trying to break it to see if I can recover from a hard crash. Well, I've broke it :) I've checked on the HOWTO and I'm subscribed to the mailing list and checked the archives and I can't find anything to assist me recover so here goes. Here's my setup: Red Hat 7.3 - kernel 2.4.18-24 lvm-1.0.3-4.i386.rpm 20 SCSI's disks in a Linux software RAID10 One volume group (vgcreate -s 16M cubsvg1 /dev/md10) One logical volume with space left over for snapshots (lvcreate -L150G -ncubslv1 cubsvg1) Ext3 on top of mylv1 Here's how I "broke" it - I mounted the filesystem (mount /dev/myvg1/mylv1 /mnt/test) and then while I was doing a large dd (dd if=/dev/zero of=testfile bs=64k count=10000) I powered down the server. When the server came back up I received the following error when trying to do a vgscan: vgscan -- reading all physical volumes (this may take a while ...) vgscan -- only found 0 of 9600 Les for LV /dev/cubsvg1/cubslv1 (0) vgscan -- ERROR "vg_read_with_pv_and_lv(): allocated LE of LV" can't get data of volume group "cubsvg1" from physical volume(s) Here is what pvdata shows: --- Physical volume --- PV Name /dev/md10 VG Name cubsvg1 PV Size 339.16 GB [711273728 secs] / NOT usable 16.25 MB [LVM: 212 KB] PV# 1 PV Status available Allocatable yes Cur LV 1 PE Size (KByte) 16384 Total PE 21705 Free PE 12105 Allocated PE 9600 PV UUID RXNxAi-v6g0-e1Ro-8U1z-1xER-9Fbv-9M1PMo --- Volume group --- VG Name VG Access read/write VG Status NOT available/resizable VG # 0 MAX LV 256 Cur LV 1 Open LV 0 MAX LV Size 1023.97 GB Max PV 256 Cur PV 1 Act PV 1 VG Size 339.14 GB PE Size 16 MB Total PE 21705 Alloc PE / Size 9600 / 150 GB Free PE / Size 12105 / 189.14 GB VG UUID lKSEyp-1O2N-H1w3-V26c-jcwP-WV1z-x7Vgyu --- List of logical volumes --- pvdata -- logical volume "/dev/cubsvg1/cubslv1" at offset 0 pvdata -- logical volume struct at offset 1 is empty pvdata -- logical volume struct at offset 2 is empty pvdata -- logical volume struct at offset 3 is empty pvdata -- logical volume struct at offset 4 is empty pvdata -- logical volume struct at offset 5 is empty ... [snip] ... --- List of physical volume UUIDs --- 001: RXNxAi-v6g0-e1Ro-8U1z-1xER-9Fbv-9M1PMo I've tried using vgcfgrestore to put back the VGDA (am I using the correct terminology?) but I can't get vgscan to get going. Can anyone point me in the right direction on how to get my volume group/logical volume back? I want to make sure that if something like this happens in production (and you know it will ;), that I can get us back up with no data loss. If you need any more information please let me know. Thanks for your help, Andy. Andrew Rechenberg Infrastructure Team, Sherman Financial Group _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
