Does this also mean that strip count can be thought of as the number of parrallel writes to different objects at different OSDs ?
Thank you On Thursday, 20 October 2016, Jason Dillaman <jdill...@redhat.com> wrote: > librbd (used by QEMU to provide RBD-backed disks) uses librados and > provides the necessary handling for striping across multiple backing > objects. When you don't specify "fancy" striping options via > "--stripe-count" and "--stripe-unit", it essentially defaults to > stripe count of 1 and stripe unit of the object size (defaults to > 4MB). > > The use-case for fancy striping settings for an RBD image are images > that have lots of small, sequential IO. The rationale for that is that > normally these small, sequential IOs will continue to hit the same PG > until the object boundary is crossed. However, if you were to use a > small stripe unit that matched your normal IO size (or a small > multiple thereof), your small, sequential IO requests would be sent to > <stripe count> PGs -- spreading the load. > > On Wed, Oct 19, 2016 at 12:32 PM, Ahmed Mostafa > <ahmedmostafa...@gmail.com <javascript:;>> wrote: > > Hello > > > > From the documentation i understand that clients that uses librados must > > perform striping for themselves, but i do not understand how could this > be > > if we have striping options in ceph ? i mean i can create rbd images that > > has configuration for striping, count and unite size. > > > > So my question is, if i created an RBD image that have striping enabled > and > > configured, will that make a difference with qemu-rbd ? by difference i > mean > > enhancing performance of my virtual machines i/o and allowing utilizing > the > > cluster resources > > > > Thank you > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users@lists.ceph.com <javascript:;> > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > -- > Jason >
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