Re: [ceph-users] RBD Cache and rbd-nbd

On Mon, May 14, 2018 at 12:15 AM, Marc Schöchlin wrote: > Hello Jason, > > many thanks for your informative response! > > Am 11.05.2018 um 17:02 schrieb Jason Dillaman: >> I cannot speak for Xen, but in general IO to a block device will hit >> the pagecache unless the IO

Re: [ceph-users] RBD Cache and rbd-nbd

Hello Jason, many thanks for your informative response! Am 11.05.2018 um 17:02 schrieb Jason Dillaman: > I cannot speak for Xen, but in general IO to a block device will hit > the pagecache unless the IO operation is flagged as direct (e.g. > O_DIRECT) to bypass the pagecache and directly send

Re: [ceph-users] RBD Cache and rbd-nbd

On Fri, May 11, 2018 at 3:59 AM, Marc Schöchlin wrote: > Hello Jason, > > thanks for your response. > > > Am 10.05.2018 um 21:18 schrieb Jason Dillaman: > > If i configure caches like described at > http://docs.ceph.com/docs/luminous/rbd/rbd-config-ref/, are there dedicated >

Re: [ceph-users] RBD Cache and rbd-nbd

Hello Jason, thanks for your response. Am 10.05.2018 um 21:18 schrieb Jason Dillaman: >> If i configure caches like described at >> http://docs.ceph.com/docs/luminous/rbd/rbd-config-ref/, are there dedicated >> caches per rbd-nbd/krbd device or is there a only a single cache area. > The librbd

Re: [ceph-users] RBD Cache and rbd-nbd

On Thu, May 10, 2018 at 12:03 PM, Marc Schöchlin wrote: > Hello list, > > i map ~30 rbds per xenserver host by using rbd-nbd to run virtual machines > on these devices. > > I have the following questions: > > Is it possible to use rbd cache for rbd-nbd? I assume that this is

[ceph-users] RBD Cache and rbd-nbd

Hello list, i map ~30 rbds  per xenserver host by using rbd-nbd to run virtual machines on these devices. I have the following questions: * Is it possible to use rbd cache for rbd-nbd? I assume that this is true, but  the