On Wed, Sep 07, 2016 at 03:36:38PM -0400, Stefan Hajnoczi wrote: > 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/ I sure hope it works better today than it did back in 2014 :-( Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-builder quickly builds VMs from scratch http://libguestfs.org/virt-builder.1.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
