Splitting a mirror with LVM
 

Hi guys,

I'm running Red Hat Enterprise Linux ES release 4 (Nahant Update 6).

I've created a mirror of a Logical Volume with this command:

# lvconvert -m1 --corelog /dev/datavg/data /dev/dm-16

Now I've this:

# lvs -a -o name,copy_percent,devices
LV Copy% Devices
data 100.00 data_mimage_0(0),data_mimage_1(0)
[data_mimage_0] /dev/dm-11(0)
[data_mimage_0] /dev/dm-10(0)
[data_mimage_0] /dev/dm-14(0)
[data_mimage_1] /dev/dm-16(0)
ctrlmlv /dev/sda2(800)
homelv /dev/sda2(608)
slashlv /dev/sda2(0)
swaplv /dev/sda2(960)
tmplv /dev/sda2(832)


What I want to do is to remove the copy of that LV from my PV dm-11, dm-10 and dm-14.

I tried this:

# lvconvert -m0 /dev/datavg/data /dev/dm-10 /dev/dm-11 /dev/dm-14
No free extents on physical volume "/dev/dm-10"
No free extents on physical volume "/dev/dm-11"
No mirror images found using specified PVs.

What did I do wrong? My goal was to remove devices dm-10, dm-11 and dm-14 from my VG, so I decided to extend the VG with dm-16 and mirror my data LV to that device, then split that mirror from the other devices. The FS is mounted and need to stay online...

Thanks
Jonathan

Hi,
We have splitted our mirror with the same command, good luck.

[root@aq01 scsi_host]# pvs
PV VG Fmt Attr PSize PFree
/dev/cciss/c0d0p2 rootvg lvm2 a- 67.31G 27.78G
/dev/dm-10 aq0110 lvm2 a- 70.00G 1.95G
/dev/dm-6 aq0110 lvm2 a- 70.00G 1.88G
/dev/dm-7 aq0110 lvm2 a- 70.00G 1.88G
/dev/dm-8 aq0110 lvm2 a- 70.00G 1.88G
/dev/dm-9 aq0110 lvm2 a- 70.00G 1.88G
/dev/sdl aq0110 lvm2 a- 68.11G 0
/dev/sdm aq0110 lvm2 a- 68.11G 0
/dev/sdn aq0110 lvm2 a- 68.11G 0
/dev/sdo aq0110 lvm2 a- 68.11G 64.00M
/dev/sdp aq0110 lvm2 a- 68.11G 0

[root@aq01 scsi_host]# lvconvert -m0 aq0110/aq0110_01 /dev/sdl /dev/sdm /dev/sdn /dev/sdo /dev/sdp
Logical volume aq0110_01 converted.

[root@aq01 scsi_host]# pvs
PV VG Fmt Attr PSize PFree
/dev/cciss/c0d0p2 rootvg lvm2 a- 67.31G 27.78G
/dev/dm-10 aq0110 lvm2 a- 70.00G 1.95G
/dev/dm-6 aq0110 lvm2 a- 70.00G 1.88G
/dev/dm-7 aq0110 lvm2 a- 70.00G 1.88G
/dev/dm-8 aq0110 lvm2 a- 70.00G 1.88G
/dev/dm-9 aq0110 lvm2 a- 70.00G 1.88G
/dev/sdl aq0110 lvm2 a- 68.11G 68.11G
/dev/sdm aq0110 lvm2 a- 68.11G 68.11G
/dev/sdn aq0110 lvm2 a- 68.11G 68.11G
/dev/sdo aq0110 lvm2 a- 68.11G 68.11G
/dev/sdp aq0110 lvm2 a- 68.11G 68.11G