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

[Alessandro MACUZ]

2013/7/2 Alessandro MACUZ <alessandro.macuz at 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 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#*
>


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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