Installation guide

Chapter 5. LVM Configuration Examples

May 10 14:55:00 doc-07 lvm[19402]: vg001-mirrorlv is now in-sync

8. You can use the lvs with the -o +devices options to display the configuration of the mirror,

including which devices make up the mirror legs. You can see that the logical volume in this

example is composed of two linear images and one log.

[root@doc-07 ~]# lvs -a -o +devices

LV VG Attr LSize Origin Snap% Move Log Copy%

Convert Devices

mirrorlv vg001 mwi-a- 3.91G mirrorlv_mlog 100.00

mirrorlv_mimage_0(0),mirrorlv_mimage_1(0)

[mirrorlv_mimage_0] vg001 iwi-ao 3.91G

/dev/xvdb1(1)

[mirrorlv_mimage_1] vg001 iwi-ao 3.91G

/dev/xvdb2(1)

[mirrorlv_mlog] vg001 lwi-ao 4.00M

/dev/xvdc1(0)

You can use the seg_pe_ranges option of the lvs to display the data layout. You can use this

option to verify that your layout is properly redundant. The output of this command displays PE

ranges in the same format that the lvcreate and lvresize commands take as input.

[root@doc-07 ~]# lvs -a -o +seg_pe_ranges --segments

PE Ranges

mirrorlv_mimage_0:0-999 mirrorlv_mimage_1:0-999

/dev/xvdb1:1-1000

/dev/xvdb2:1-1000

/dev/xvdc1:0-0

Note

For information on recovering from the failure of one of the legs of an LVM mirrored volume, see

Section 6.3, “Recovering from LVM Mirror Failure”.