Solved: slow performance CEPH RBD on KVM
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.
> Andrija Panic <andrija.panic@xxxxxxxxx> hat am 5. August 2018 um 11:05 geschrieben:
> 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.
> On Fri, Aug 3, 2018, 16:05 Benjamin Naber <benjamin.naber@xxxxxxxxxxxxxx>
> > >
> > 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
> > >