qcow2 template, clone to LVM - possible?

[matko]

After some successful cloning processes (LVM template, LVM destination) I'm trying to improve the speed by using compressed qcow2 template instead.
The LVM is 50GB, and the compressed .qcow2 I created is 400MB, so it means essentially I read only 400MB over network (but still write 50GB to destination) instead of reading the full 50GB LVM.

I then tried to place the .qcow2 template in varios places to get proxmox web ui to pick it up, so I can use it from the gui but to no avail. I tried sticking it on both "template" (nfs) datastores and "images" (nfs) datastore, at the following paths:

/mnt/pve/templates/template/centos-minimal-try1.qcow2
/mnt/pve/os-isos/images/centos-minimal-try1.qcow2
/mnt/pve/os-isos/centos-minimal-try1.qcow2
/mnt/pve/os-isos/dump/centos-minimal-try1.qcow2

Proxmox is not picking it up, so I guess the proxmox backends reads the contents of the above directories periodically, but only expects a certain type of file names etc. Please advice!

I generated the the qcow2 file from an existing (LVM) template, using qemu-img like this:

qemu-img convert -t writeback -c -p -O qcow2 /dev/TEST01/vm-103-disk-1 -c /mnt/pve/templates/template/centos-minimal-try1.qcow2


Please advice

 

[matko]

Proxmox expects '$datastore/images/<vmid>/<file>.<filename>' - in my case, /mnt/pve/os-isos/images/996.

.qcow2 didn't work out, but .raw did (which also is sparse).

 

[dietmar]

Here is an example. MY VM us a single disk:

# qm config 106|grep '^virtio0'
virtio0: local:106/vm-106-disk-2.qcow2,format=qcow2,size=1G

The file system path is:

# pvesm path local:106/vm-106-disk-2.qcow2
/var/lib/vz/images/106/vm-106-disk-2.qcow2


After converting that to a template i get:

# qm config 106|grep '^virtio0'
virtio0: local:106/base-106-disk-2.qcow2,format=qcow2,size=1G

# pvesm path local:106/base-106-disk-2.qcow2
/var/lib/vz/images/106/base-106-disk-2.qcow2

So the trick is the the volume name starts with 'base-{VMID}-'

 

[dt47]

Interesting.
The part of the config from my template is virtio0: local:119/base-119-disk-1.qcow2,format=qcow2,size=7G , yet I can't clone this one to a lvm-volume, getting the message qcow2 is not supported.

 

[dietmar]

Interesting.
The part of the config from my template is virtio0: local:119/base-119-disk-1.qcow2,format=qcow2,size=7G , yet I can't clone this one to a lvm-volume, getting the message qcow2 is not supported.

AFAIK this is already fixed in git, so this bug is fixed with the next update.