[linux-lvm] I can't have the mirror_log mirrored, LVM complains "there is no suitable space"

[Alessandro MACUZ]

The process here below is self-explanatory of what happens.


Starting with one volume (on /dev/sda1) I'd like to mirror it on /dev/sdb1
and having the mirror_log mirrored as well.


Though I think there is plenty of PE I get the error message


  Insufficient suitable allocatable extents for logical volume : 1536 more
required

  Unable to allocate extents for mirror(s).


I mean the mirror_log is one PE, i.e. 4 Megabytes...


Why "*lvconvert -i 5 -m1 --mirrorlog mirrored /dev/lvgrptstnlvm/root
/dev/sdb1*" doesn't work whereas

"*lvconvert -m1 /dev/lvgrptstnlvm/root /dev/sdb1*" does? The space to be
allocated differs by just one PE.


I'm using Knoppix to fix a system due to other problems, I have noticed
there was a (human) design problem with LVM and I want to achieve the goal
of one volume mirrored in 2 parts and 2 mirrors logs each on one disk.


Thanks,


Alex


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


*root at Microknoppix:/home/knoppix# lvs -a -o +devices,lv_size*

  LV              VG           Attr     LSize Pool Origin Data%  Move
Log       Copy%  Convert Devices                           LSize

  root            lvgrptstnlvm mwi-aom- 6.00g
root_mlog 100.00         root_mimage_0(0),root_mimage_1(0) 6.00g

  [root_mimage_0] lvgrptstnlvm iwi-aom-
6.00g
/dev/sda1(0)                      6.00g

  [root_mimage_1] lvgrptstnlvm iwi-aom-
6.00g
/dev/sdb1(0)                      6.00g

  [root_mlog]     lvgrptstnlvm lwi-aom-
4.00m
/dev/sdb1(1536)                   4.00m

*
*

*root at Microknoppix:/home/knoppix# pvs -v -o +pv_pe_count,pv_pe_alloc_count*

    Scanning for physical volume names

  PV         VG           Fmt  Attr PSize PFree DevSize PV
UUID                                PE   Alloc

  /dev/sda1  lvgrptstnlvm lvm2 a--  9.00g 3.00g   9.00g
5h4peZ-7SVd-MKrH-IQNJ-UACQ-mM7Q-6CVeo5 2303  1536

  /dev/sdb1  lvgrptstnlvm lvm2 a--  7.07g 1.06g   9.00g
VlGEw0-JaqC-THbz-G4mv-yHq5-9Y80-N5ANNQ 1809  1537

*
*

*root at Microknoppix:/home/knoppix# lvs -a -o +devices,lv_size*

  LV              VG           Attr     LSize Pool Origin Data%  Move
Log       Copy%  Convert Devices                           LSize

  root            lvgrptstnlvm mwi-aom- 6.00g
root_mlog 100.00         root_mimage_0(0),root_mimage_1(0) 6.00g

  [root_mimage_0] lvgrptstnlvm iwi-aom-
6.00g
/dev/sda1(0)                      6.00g

  [root_mimage_1] lvgrptstnlvm iwi-aom-
6.00g
/dev/sdb1(0)                      6.00g

  [root_mlog]     lvgrptstnlvm lwi-aom-
4.00m
/dev/sdb1(1536)                   4.00m

*
*

*root at Microknoppix:/home/knoppix# lvconvert -m0 /dev/lvgrptstnlvm/root
/dev/sdb1*

  /sbin/dmeventd: stat failed: No such file or directory

  Logical volume root converted.

*
*

*root at Microknoppix:/home/knoppix# lvconvert -i 5 -m1 --mirrorlog mirrored
/dev/lvgrptstnlvm/root /dev/sdb1*

  Insufficient suitable allocatable extents for logical volume : 1536 more
required

  Unable to allocate extents for mirror(s).

*
*

*root at Microknoppix:/home/knoppix# lvconvert -m1 /dev/lvgrptstnlvm/root
/dev/sdb1*

  lvgrptstnlvm/root: Converted: 0.5%

[...SKIP...]
  lvgrptstnlvm/root: Converted: 100.0%

*
*

*root at Microknoppix:/home/knoppix# lvs -a -o +devices,lv_size*

  LV              VG           Attr     LSize Pool Origin Data%  Move
Log       Copy%  Convert Devices                           LSize

  root            lvgrptstnlvm mwi-aom- 6.00g
root_mlog 100.00         root_mimage_0(0),root_mimage_1(0) 6.00g

  [root_mimage_0] lvgrptstnlvm iwi-aom-
6.00g
/dev/sda1(0)                      6.00g

  [root_mimage_1] lvgrptstnlvm iwi-aom-
6.00g
/dev/sdb1(0)                      6.00g

  [root_mlog]     lvgrptstnlvm lwi-aom-
4.00m
/dev/sdb1(1536)                   4.00m

*
*

*root at Microknoppix:/home/knoppix# pvs -v -o +pv_pe_count,pv_pe_alloc_count*

    Scanning for physical volume names

  PV         VG           Fmt  Attr PSize PFree DevSize PV
UUID                                PE   Alloc

  /dev/sda1  lvgrptstnlvm lvm2 a--  9.00g 3.00g   9.00g
5h4peZ-7SVd-MKrH-IQNJ-UACQ-mM7Q-6CVeo5 2303  1536

  /dev/sdb1  lvgrptstnlvm lvm2 a--  7.07g 1.06g   9.00g
VlGEw0-JaqC-THbz-G4mv-yHq5-9Y80-N5ANNQ 1809  1537

*
*

*root at Microknoppix:/home/knoppix#*
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/linux-lvm/attachments/20130702/4dbe9bac/attachment.htm>