Qcow2 does lazy allocation. Try to write big file inside VM with dd (say 10GB), erase it and try again. May be lazy allocation works bad for your raid5e.
5 авг. 2017 г. 23:29 пользователь "Rodrigo Baldasso" < rodr...@loophost.com.br> написал: > Yes.. mounting an lvm volume inside the host works great, ~500Mb/s write > speed.. inside the guest i'm using ext4 but the speed is aroung 30mb/s. > > - - - - - - - - - - - - - - - - - - - > > Rodrigo Baldasso - LHOST > > (51) 9 8419-9861 > - - - - - - - - - - - - - - - - - - - > On 05/08/2017 13:26:00, Ivan Kudryavtsev <kudryavtsev...@bw-sw.com> wrote: > Rodrigo, is your fio testing shows great results? What filesystem you are > using? KVM is known to work very bad over BTRFS. > > 5 авг. 2017 г. 23:16 пользователь "Rodrigo Baldasso" > rodr...@loophost.com.br> написал: > > Hi Ivan, > > In fact i'm testing using local storage.. but on NFS I was getting similar > results also. > > Thanks! > > - - - - - - - - - - - - - - - - - - - > > Rodrigo Baldasso - LHOST > > (51) 9 8419-9861 > - - - - - - - - - - - - - - - - - - - > On 05/08/2017 13:03:24, Ivan Kudryavtsev wrote: > Hi, Rodrigo. It looks strange. Check your NFSconfiguration and network > errors, loss. It should work great. > > 5 авг. 2017 г. 22:22 пользователь "Rodrigo Baldasso" > rodr...@loophost.com.br> написал: > > Hi everyone, > > I'm having trouble to archive a good I/O rate using cloudstack qcow2 with > any type of caching (or even disabled). > > We have some RAID-5e SSD arrays which give us a very good rates directly on > the node/host, but on the guest the speed is terrible. > > Does anyone knows a solution/workaround for this? I never used qcow (only > raw+lvm) so I don't know much to do to solve this. > > Thanks! >
