The original LV named data/bigdata consists of two separate drives: /dev/sdc1 (6T) and /dev/sdd1 (5T) .
I would like to replace these two disks by the 12T single drive (/dev/sde).
The standard way is using the pvmove commnad. However, I opted to use mirroring approach.
- Create mirror:
pvcreate /dev/sde1
vgextend data /dev/sde1
lvconvert --type mirror -m 1 /dev/data/bigdatalvs -a -o name,copy_percent,devices data
lvs --all --segments -o +devices
- remove old disks from the mirror
lvconvert -m0 data/bigdata /dev/sdc1 /dev/sdd1
Now there is 1PE free space between two segments on /dev/sde1
[root@server ~]# pvs --segments -v PV VG Fmt Attr PSize PFree Start SSize LV Start Type PE Ranges /dev/sdc1 data lvm2 a-- <5.46t <5.46t 0 1430791 0 free /dev/sdd1 data lvm2 a-- <4.55t <4.55t 0 1192326 0 free /dev/sde1 data lvm2 a-- 10.91t <5.46t 0 1430791 bigdata 0 linear /dev/sde1:0-1430790 /dev/sde1 data lvm2 a-- 10.91t <5.46t 1430791 1 0 free /dev/sde1 data lvm2 a-- 10.91t <5.46t 1430792 1192326 bigdata 0 linear /dev/sde1:1430792-2623117
to remove the free space, move the second segment from /dev/sde1 to the old drive, and than back to /dev/sde1
pvmove /dev/sde1:1430792-2623117 /dev/sdc1 pvmove /dev/sdc1 /dev/sde1
[root@server ~]# pvs --segments -v PV VG Fmt Attr PSize PFree Start SSize LV Start Type PE Ranges /dev/sdc1 data lvm2 a-- <5.46t <5.46t 0 1430791 0 free /dev/sdd1 data lvm2 a-- <4.55t <4.55t 0 1192326 0 free /dev/sde1 data lvm2 a-- 10.91t <929.45g 0 2623117 bigdata 0 linear /dev/sde1:0-2623116 /dev/sde1 data lvm2 a-- 10.91t <929.45g 2623117 237938 0 free
This way the two segments join without further conditions.
pvdisplay -m /dev/sde1
lvs --all --segments -o +devices data
lvs -a -o name,copy_percent,devices datapvs --segments -v
