Feature request: KVM disk caching properties

[twocell]

I'd like to be able to set the disk caching properties in the web gui. The caching properties are:

-writeback: highest performance, high risk of data corruption on power failure.
-writethough: uses host paging file, has perfomance problems with qcow2.
-none: no host caching.
-default: writeback for qcow2, writethrough for all others.

With the qcow2 format either writeback or none supposedly performance better than writehrough.

Would these settings be a good candidate for addition to the gui? Is there a way I can play with these from the shell?

 

[dietmar]

Would these settings be a good candidate for addition to the gui?

yes - we plan to add the in V2.0

Is there a way I can play with these from the shell?

Directly edit the config file in /etc/qemu-server/<vmid>.conf
(see "man qm")

 

[twocell]

Awesome! Thank you.