On 16.03.2016 23:36, Raimonds Cicans wrote:
I am trying to move LVM setup from old RAID md0 to new RAID md1
I did "lvconvert -m 1 /dev/path/to/logical_volume /dev/md1" on bunch of
logical volumes.
Everything went without problems.
Then I tried to remove md0 from one of logical volumes by running command:
lvconvert -m 0 /dev/varlin/distfiles /dev/md0
I tried to mount this logical volume, but failed.
Then I checked first megabyte of logical volume it was zero filled.
Partial output of "lvs -o+devices":
LV VG Attr LSize Pool Origin Data% Meta%
Move Log Cpy%Sync Convert Devices
backup varlin -wi-ao---- 100,00g
/dev/md0(6304)
backup varlin -wi-ao---- 100,00g
/dev/md0(8544)
data varlin -wi-ao---- 20,00g
/dev/md0(28384)
distfiles varlin -wi-a----- 20,00g
/dev/md1(2738)
ftp varlin rwi-aor--- 10,00g 100,00
ftp_rimage_0(0),ftp_rimage_1(0)
ftpdown varlin rwi-aor--- 10,00g 100,00
ftpdown_rimage_0(0),ftpdown_rimage_1(0)
lvm2: 2.02.116
kernel: 4.4.2
I made following test:
I unmounted /opt and dumped to files following volumes:
/dev/mapper/varlin-opt
/dev/mapper/varlin-opt_rimage_0
/dev/mapper/varlin-opt_rimage_1
and then diff-ed them.
/dev/mapper/varlin-opt_rimage_0 was not equal with /dev/mapper/varlin-opt.
Why??? I thought 100 in Cpy%Sync column of lvs output mean volume is
fully synchronized.
With "lvconvert -m0" I removed /dev/mapper/varlin-opt_rimage_0 from
/dev/mapper/varlin-opt.
I did some test of volume - everything was normal.
My plan for now:
for each mirrored volume:
1) do volume content backup
2) umount volume
3) run md5sum for volume itself and all mirror sub-volumes
4) with "lvconvert -m0" remove sub-volume which is not equal to volume
5) do some volume tests
6) if something went wrong - restore volume content from backup
7) if on step 4 was removed new RAID md1, then make pvmove to md1
Best regards,
Raimonds Cicans
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