Cool, I didn't consider this as a variable :) IDE works extremely slow indeed... anyway, make sure to also have RBD caching on KVM side.
Cheers On Mon, Aug 6, 2018, 14:51 Benjamin Naber <benjamin.na...@coders-area.de> wrote: > Hi Andrija, > > i figured out the problem. templates should be created as OS: Other PV > Virtio-SCSI (64-bit) otherwise, vm disk will created as an IDE Device. > > Afther changing the setting i got my Performance and a well working > environment. > > > Kind regards > > Ben > > > > > Andrija Panic <andrija.pa...@gmail.com> hat am 5. August 2018 um > 11:05 geschrieben: > > > > Hi, > > > > Google "enable rbd cache on KVM" - this is supposed to enable write > back > > cache if client OS sends proper flush commands (i.e. linux kernel > newer > > than 3.0) - will NOT help with reads, obviously... > > > > For rest, there can be done some tunning, but expect no miracle. > > > > You didn't specify ceph cluster details, journals setup, etc - would > be > > useful to know, then KVM host version, etc. > > > > Cheers > > > > On Fri, Aug 3, 2018, 16:05 Benjamin Naber < > benjamin.na...@coders-area.de> > > wrote: > > > > > > > > > Hi @all, > > > > > > ive setup a Ceph Cluster in combination with KVM Hosts. If i > benchmark > > > ceph rbd performance from Hypervisor itself i got 10 times > higher > > > performance than from using a cloudstack created guest-vm. > > > are there any recommendet settings for KVM Hosts in cloudstack > or KVM > > > using with ceph rbd ? > > > > > > kind regards > > > Ben > > > > > > > >
