On Tue, Sep 06, 2016 at 12:44:39PM +0430, Aarian P. Aleahmad wrote: > I am looking for a solution to cache a VM on a SSD without the guest > knowing about it. We can do it by caching the disk on which the VM's disk > is lcoated with a SSD or we can do it through the hypervisor (i.e. Qemu, > KVM, etc.). > > I was thinking about passing an ssd device to the hypervisor as a cache > disk (e.g. passing /dev/sdb to the hypervisor) or making a new virtual disk > image and storing it on a SSD and passing the SSD located vDisk to the > hypervisor as a cache. > > Thus, I would like to know whether is it possible or not, and if not, if I > wish to implement such a thing, what should I do and whether is there any > reusable code to do so or not? QEMU itself doesn't offset tiering/caching but you can use the host kernel's bcache or dm-cache features to achieve this. I haven't tried them myself so I can't give exact command-lines. Richard Jones posted a tutorial in 2014: https://rwmj.wordpress.com/2014/05/22/using-lvms-new-cache-feature/ Stefan
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