Hi,
Please see the issue detailed in
https://unix.stackexchange.com/q/375051/4671
Short version:
If I create a RAID 1 mirror,
lvconvert --type raid1 --mirrors 1 /dev/newdebian/debian_boot /dev/md2
and then try to split it using
lvconvert --splitmirrors 1 --name debian_boot_copy /dev/newdebian/debian_boot
I get the error
Unable to determine sync status of newdebian/debian_boot.
Unable to split newdebian/debian_boot while it is not in-sync.
See the full transcript at at the foot of this email.
Based on looking at the code in lvconvert, it seems this error is thrown
when sync percentage for the RAID is missing. But there is no indication
why this percentage is missing.
Any suggestions for debugging appreciated. And please copy me on any
response. Thanks.
Regards, Faheem Mitha
#####################################################################
Given volume groups debian and newdebian, make a copy of lv
/dev/debian/boot in newdebian.
Rename `/dev/debian/boot` to `/dev/debian/debian_boot`.
Rename `/dev/debian/home` to `/dev/debian/debian_home`.
Rename `/dev/debian/root` to `/dev/debian/debian_root`.
lvrename /dev/debian/boot /dev/debian/debian_boot
lvrename /dev/debian/home /dev/debian/debian_home
lvrename /dev/debian/root /dev/debian/debian_root
Make debian VG inactive.
vgchange -a n debian
Run merge command. This merges debian into newdebian.
vgmerge -A y -l -v newdebian debian
Then create a RAID 1 mirror pair from `/dev/newdebian/debian_boot`
using lvconvert. The `dest-pv` argument tells lvconvert to make the
mirror copy on /dev/md2.
lvconvert --type raid1 --mirrors 1 <<source-lv>> <<dest-pv>>
lvconvert --type raid1 --mirrors 1 /dev/newdebian/debian_boot /dev/md2
Then split the mirror. The new LV is now `debian_boot_copy`.
lvconvert --splitmirrors 1 --name <<source-lv-copy>> <<source-lv>>
lvconvert --splitmirrors 1 --name debian_boot_copy /dev/newdebian/debian_boot
Make /dev/newdebian/debian_boot, /dev/newdebian/debian_home,
/dev/newdebian/debian_root inactive.
vgchange -a n /dev/newdebian/debian_boot /dev/newdebian/debian_home /dev/newdebian/debian_root
Then split the VGs.
vgsplit -v <<source-vg>> <<destination-vg>> <<moved-to-pv>>
vgsplit -v /dev/newdebian /dev/debian /dev/md1
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