| 2018-11-06 13:42:36 |
Christian Ehrhardt |
description |
I am trying to create a logical volume storage pool with persistent
device names for the block devices, because I can't/don't want to ensure
that /dev/sd* names are persistent through reboots.
virsh # pool-define-as web2067 logical - -
/dev/disk/by-path/pci-0000:18:00.0-scsi-0:2:2:0 web2067 /dev/web2067
virsh # pool-build web2067
These two steps work as expected and the pv and the vg get created, but
when I try to start the pool I get the following error:
virsh # pool-start web2067
error: Failed to start pool web2067
error: unsupported configuration: cannot find any matching source
devices for logical volume group 'web2067'
If I do the same steps just with /dev/sdX instead of
/dev/disk/by-path/..., the pool gets created correctly.
According to the libvirt mailing list /dev and /dev/disk/by-path are
supposed to work the same way. |
lvm2 tools do not store by-path values in their config.
That can drive scripts/tools (like the libvirt case here) mad.
Simplified example:
$ sudo /sbin/pvcreate /dev/disk/by-path/virtio-pci-0000:00:07.0
$ sudo /sbin/pvs --noheadings -o pv_name,vg_name
/dev/vdc
It is NOT using /dev/disk/by-path/virtio-pci-0000:00:07.0 as instructed, but instead did the mapping to /dev/vdd and keeps that from now on.
I know that "inside" lvm all that is done via metadata and it won't matter.
But tools around it get confused.
Not sure yet if it is a real issue, or just "works as designed".
--- started as libvirt issue - keeping old desc below ---
I am trying to create a logical volume storage pool with persistent
device names for the block devices, because I can't/don't want to ensure
that /dev/sd* names are persistent through reboots.
virsh # pool-define-as web2067 logical - -
/dev/disk/by-path/pci-0000:18:00.0-scsi-0:2:2:0 web2067 /dev/web2067
virsh # pool-build web2067
These two steps work as expected and the pv and the vg get created, but
when I try to start the pool I get the following error:
virsh # pool-start web2067
error: Failed to start pool web2067
error: unsupported configuration: cannot find any matching source
devices for logical volume group 'web2067'
If I do the same steps just with /dev/sdX instead of
/dev/disk/by-path/..., the pool gets created correctly.
According to the libvirt mailing list /dev and /dev/disk/by-path are
supposed to work the same way. |
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