[linux-lvm] lvconvert -m 0 /dev/varlin/distfiles /dev/md0 => zero filled logical volume

[Raimonds Cicans]

On 17.03.2016 00:00, Stuart Gathman wrote:
> On 03/16/2016 05:36 PM, 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
>>
>>
>> Questions:
>>
>> 1) What I did wrong?
> I would have used pvmove.  Using lvconvert, I think you needed to sync
> the mirrors before removing a leg.

How do I sync mirror before removing leg? I thought 100 in Cpy%Sync 
column mean - everything is in sync.


Best regards,
Raimonds Cicans