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Solved: slow performance CEPH RBD on KVM


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.panic@xxxxxxxxx> 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.naber@xxxxxxxxxxxxxx>
>     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
> > 
> >     >