On Fri, Mar 23, 2018 at 11:30 AM Gang He <g...@suse.com> wrote: > Hello List, > > Since I am new to LVM area, but I got a problem about LVM can't work > normally after attaching disk volumes originally in a VG on another machine. > Then, I sent this problem to the list, to see if we can get a fix or there > has been a fix. > The problem is very easy to reproduce, > 1) create two virtual machines(tb0307-nd1, tb0307-nd2), create two virtual > disks. >
Do you mean 2 logical volumes on the host? > 2) attach two virtual disks to VM1(tb0307-nd1). > Are you attaching the logical volumes created on the host to the VM? > tb0307-nd1:/# lsblk > NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT > sr0 11:0 1 4.3G 0 rom > vda 254:0 0 40G 0 disk > ├─vda1 254:1 0 4G 0 part [SWAP] > ├─vda2 254:2 0 23.6G 0 part / > └─vda3 254:3 0 12.4G 0 part /home > vdb 254:16 0 40G 0 disk > vdc 254:32 0 20G 0 disk <<= disk1 > vdd 254:48 0 20G 0 disk <<= disk2 > 3) pvcreate two virtual disks, and add them to vg1. > tb0307-nd1:/# pvcreate /dev/vdc > Physical volume "/dev/vdc" successfully created. > tb0307-nd1:/# pvcreate /dev/vdd > Physical volume "/dev/vdd" successfully created. > tb0307-nd1:/# pvs > PV VG Fmt Attr PSize PFree > /dev/vdc lvm2 --- 20.00g 20.00g > /dev/vdd lvm2 --- 20.00g 20.00g > tb0307-nd1:/# vgcreate vg1 /dev/vdc /dev/vdd > 4) disconnect two virtual disks from VM1, and attach disk1 to > VM2(tb0307-nd2). > If /dev/vdc and /dev/vdd are logical volumes on the host, lvm on the host just scanned these lvs and discovered the metadata created within the VM. > 5) delete vg1, create vg2, and add disk1 to vg2. > tb0307-nd2:~ # pvs > WARNING: Device for PV t6gjHU-dtY4-th5O-A0mr-5OEC-R1ZK-TPQgIh not found > or rejected by a filter. > PV VG Fmt Attr PSize PFree > /dev/vdc vg1 lvm2 a-- 20.00g 20.00g > [unknown] vg1 lvm2 a-m 20.00g 20.00g > tb0307-nd2:~ # pvremove /dev/vdc > WARNING: Device for PV t6gjHU-dtY4-th5O-A0mr-5OEC-R1ZK-TPQgIh not found > or rejected by a filter. > PV /dev/vdc is used by VG vg1 so please use vgreduce first. > (If you are certain you need pvremove, then confirm by using --force > twice.) > /dev/vdc: physical volume label not removed. > tb0307-nd2:~ # vgreduce --removemissing vg1 > WARNING: Device for PV t6gjHU-dtY4-th5O-A0mr-5OEC-R1ZK-TPQgIh not found > or rejected by a filter. > Wrote out consistent volume group vg1. > tb0307-nd2:~ # pvs > PV VG Fmt Attr PSize PFree > /dev/vdc vg1 lvm2 a-- 20.00g 20.00g > tb0307-nd2:~ # vgremove vg1 > Volume group "vg1" successfully removed > tb0307-nd2:~ # vgcreate vg2 /dev/vdc > Volume group "vg2" successfully created > tb0307-nd2:~ # vgs > VG #PV #LV #SN Attr VSize VFree > vg2 1 0 0 wz--n- 20.00g 20.00g > tb0307-nd2:~ # pvs > PV VG Fmt Attr PSize PFree > /dev/vdc vg2 lvm2 a-- 20.00g 20.00g > > 6) attach disk2 to VM2(tb0307-nd2), the vg on VM2 looks abnormal. > tb0307-nd2:~ # pvs > WARNING: Device for PV JJOL4H-kc0j-jyTD-LDwl-71FZ-dHKM-YoFtNV not found > or rejected by a filter. > PV VG Fmt Attr PSize PFree > /dev/vdc vg2 lvm2 a-- 20.00g 20.00g > /dev/vdd vg1 lvm2 a-- 20.00g 20.00g > [unknown] vg1 lvm2 a-m 20.00g 20.00g > tb0307-nd2:~ # vgs > WARNING: Device for PV JJOL4H-kc0j-jyTD-LDwl-71FZ-dHKM-YoFtNV not found > or rejected by a filter. > VG #PV #LV #SN Attr VSize VFree > vg1 2 0 0 wz-pn- 39.99g 39.99g > vg2 1 0 0 wz--n- 20.00g 20.00g > > 7) reboot VM2, the result looks worse (vdc disk belongs to two vg). > tb0307-nd2:/mnt/shared # pvs > PV VG Fmt Attr PSize PFree > /dev/vdc vg1 lvm2 a-- 20.00g 0 > /dev/vdc vg2 lvm2 a-- 20.00g 10.00g > /dev/vdd vg1 lvm2 a-- 20.00g 9.99g > > > It looks like LVM2 meta consistency problem? please help to take a look. > If you want to attach logical volumes to VMs, you must make sure that these volumes are not accessible to LVM on the host. A good way to achieve this is to setup devices:filter in lvm.conf so LVM can access only the disks required by the host (e.g. /dev/sda2). Check this for more info on this problem: https://ovirt.org/blog/2017/12/lvm-configuration-the-easy-way/ Nir
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