Solved KVM question (backing store)?

[Emad R]

Can someone help me by providing me more info of KVM or Qemu or Qcow2 (not sure which provides this) Backing store functionality ?

From what I read it seems related to how you can create a golden image and the others will be overlays, but not sure how this works and when I can choose what time the image is golder.

Is this related or can be used as HA ? and why are you using it ?

Thanks

[Emad R]

@emad-r

Also note:

When i used this option and saved to 2 location, the VM saved 2 files:

in the backend store, it saved file of 200 GiB size
And the in VM destination 1.3 GiB

The real size of the VM utilized storage and space is 1.3 GiB but when I created I specified that it virtual disk size is 200 GiB

[stacksofplates]

The backing store should be a read only image that you can run instant clones from. I don't use it since a full copy of my template only takes a couple seconds.

[Dashrender]

@stacksofplates said in KVM question (backing store)?:

The backing store should be a read only image that you can run instant clones from. I don't use it since a full copy of my template only takes a couple seconds.

What do you do about data backups?
And answer that in an SMB relevant fashion.

[stacksofplates]

@dashrender said in KVM question (backing store)?:

@stacksofplates said in KVM question (backing store)?:

The backing store should be a read only image that you can run instant clones from. I don't use it since a full copy of my template only takes a couple seconds.

What do you do about data backups?
And answer that in an SMB relevant fashion.

In this case I'm not sure. You would only have a base as the backing store. Any customized stuff would be in the clone. However I think this is more for things like VDI where you wouldn't back up the VM and just destroy it when you're done with it.

[matteo nunziati]

@emad-r look here
it is sort of hyper-v linked disks.

[dbeato]

Libvirt is the one that provides the Backing Store, see below:
https://kashyapc.fedorapeople.org/virt/lc-2012/snapshots-handout.html
Some more details below:
http://dustymabe.com/2015/01/11/qemu-img-backing-files-a-poor-mans-snapshotrollback/