On Mon, Sep 26, 2011 at 04:15:37PM +0800, Emmanuel Noobadmin wrote: > On 9/26/11, Robin Lee Powell <rlpowell@xxxxxxxxxxxxxxxxxx> wrote: > > On Mon, Sep 26, 2011 at 01:49:18PM +0800, Emmanuel Noobadmin wrote: > >> On 9/25/11, Robin Lee Powell <rlpowell@xxxxxxxxxxxxxxxxxx> wrote: > >> > > >> > OK, so I've got a Linux host, and a bunch of Linux VMs. > >> > > >> > This means that the host *and* all tho VMs do their own disk > >> > caches/buffers and do their own swap as well. > >> > >> If I'm not wrong, that's why the recommended and current default > >> in libvirtd is to create storage devices with no caching to remove > >> one layer of duplication. > > > > How do you do that? I have my VMs using LVs created on the host as > > their disks, but I'm open to other methods if there are significant > > advantages. > > It's unrelated to what you're actually using as the disks, whether > file or block devices like LVs. I think it just makes KVM tell the > host not to cache I/O done on the storage device. Wait, hold on, I think I had it backwards. It tells the *host* to not cache the device in question, or the *VMs* to not cache the device in question? -Robin -- 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
