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



2013/7/2 Alessandro MACUZ <alessandro macuz gmail com>

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

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

  Logical volume root converted.


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

  lvgrptstnlvm/root: Converted: 0.5%

[...SKIP...]

  lvgrptstnlvm/root: Converted: 100.0%


root 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 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 Microknoppix:/home/knoppix#



Same result if done from a Debian LiveCD. If there are a lot of PEs why LVM complains it is not suitable, in my case it needs just 1 PE.

I used --alloc anywherebut it noticed the two mirror-logs were on the same disk, thing that I don't want of course...

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