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
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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#
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