0

Ok, so this has been fun to diagnose but I've learned a bit about LVM and brushed up on my MDADM, so overall not a bad day!

What I'm trying to accomplish is migrate 2 external enclosures with multiple 2 devices MDADM RAID1 mirros setup underneath of a giant LVM.

Example:

sda + sdb = 2TB in RAID1 with mdadm = /dev/md1
sdc + sdd = 2TB in RAID1 with mdadm = /dev/md2

VolGroup = /dev/md1 /dev/md2
Logical Volume = 100% of Available Space in VG

I have tested without mdadm and been successful with simply using the following:

Old Server:

umount vggroup
vgchange -a n vggroup
vgexport vggroup

New Server:

pvscan
vgimport vggroup
vgchange -a n vggroup

But with the underlying mdadm I just get nothing with pvscan... Any suggestions?

0

Durp, the new server didn't have MDADM installed. Once I installed the drivers, pvscan saw the Volume Group. Ugh.. although this was my fault and dumb, I am not a fan of LVM + MDADM + External Enclosures!

Update:

Also after install mdadm, I used the following (before pvscan, so I can't be sure!), not sure if thats what helped as well, but I'm done testing this for now!

sudo mdadm --assemble --scan

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.