Problem with LVM thin pool: read failed after 0 of 4096 at 0: Input/output error

[kristian.kirilov]

Hello,

I'm trying to migrate my existing KVM images to Proxmox KVM virtual machine. I have to do that for my existing LXC containers. The storage i prefer to use is LVM thin pool, because this storage support live snapshot of all types of VM's - KVM or LXC based.

For the migration purpose i'm follow these steps:

1. I create new VM to the LVM thin pool - this creates new logical volume for me.
2. I use dd command to copy the data from my existing VM image to the newly created lvm volume.

The problem is very strange because i have success with first vm, but when i try to another i got the I/O error.
See some technical info here:

http://pastebin.com/wxLyk6iE

So when i'm in this situation i have to reboot the server, then use lvconvert --repair Root-VG/lvmthin, then use lvchange -a y Root-VG/lvmthin, and the logical volumes on the pool is also corrupted - data or metadata column is shown as 0. I have to use dd again to import the data's to the volumes.

Can somebody help me with this?

 

[seventh]

Hi,

I think you might have the same issue as I was having with metadata.
Read this thread https://forum.proxmox.com/threads/drbd9-lvm-thin-provisioning.28584/#post-151258

 

[kristian.kirilov]

Thanks a lot, i have tuned my lvm.conf to use thinpool auto extend with 80% threshold, and 20% to extend the logical volume when it was full.
Now everything is working fine.