Am 26.06.2015 um 12:47 schrieb Steve Clark <sclark at netwolves.com>: > On 06/25/2015 06:44 PM, Chris Murphy wrote: >> Gordon Messmer gordon.messmer at gmail.com Wed Jun 24 01:42:13 UTC 2015 >> >>> I wondered the same thing, especially in the context of someone who >>> prefers virtual machines. LV-backed VMs have *dramatically* better disk >>> performance than file-backed VMs. >> I did a bunch of testing of Raw, qcow2, and LV backed VM storage circa >> Fedora 19/20 and found very little difference. What mattered most was >> the (libvirt) cache setting, accessible by virsh edit the xml config >> or virt-manager through the GUI. There have been a lot of > Which setting did you find most effective? Keep in mind - write caching can improve perf but also increases data loss on abnormal VM shutdowns -- LF