change drive cache settings without losing OS

English Virtualization
1

Hi how do i change the drive’s cache type without losing the ability to boot the OS thats on it? The last time i tried it i couldnt boot the guest OS. As i’ve fixed the issue of crashes, i dont have to worry about IO so want to use the caching feature as its a big boost to the performance.

It seems that KVM has features that significantly speed up guest OS then running them natively.

2

You’ll need to clarify what drive cache you’re referring to…
Drives are cached a number of different ways, some in ways that are controllable by a User and others not.

And, there are configurations that affect disk caching but are not the actual caching like the disk I/O scheduler.

TSU