The good news is such a feature is in the early stage of design [1]. Hopefully this is a feature that will land in the Kraken release timeframe. [1] http://tracker.ceph.com/projects/ceph/wiki/Rbd_-_ordered_crash-consistent_write-back_caching_extension -- Jason Dillaman ----- Original Message ----- > From: "Daniel Niasoff" <daniel@xxxxxxxxxxxxxx> > To: ceph-users@xxxxxxxxxxxxxx > Sent: Tuesday, March 15, 2016 8:47:04 PM > Subject: Local SSD cache for ceph on each compute node. > > Hi, > > Let me start. Ceph is amazing, no it really is! > > But a hypervisor reading and writing all its data off the network off the > network will add some latency to read and writes. > > So the hypervisor could do with a local cache, possible SSD or even NVMe. > > Spent a while looking into this but it seems really strange that few people > see the value of this. > > Basically the cache would be used in two ways > > a) cache hot data > b) writeback cache for ceph writes > > There is the RBD cache but that isn't disk based and on a hypervisor memory > is at a premium. > > A simple solution would be to put a journal on each compute node and get each > hypervisor to use its own journal. Would this work? > > Something like this > http://sebastien-han.fr/images/ceph-cache-pool-compute-design.png > > Can this be achieved? > > A better explanation of what I am trying to achieve is here > > http://opennebula.org/cached-ssd-storage-infrastructure-for-vms/ > > This talk if it was voted in looks interesting - > https://www.openstack.org/summit/austin-2016/vote-for-speakers/Presentation/6827 > > Can anyone help? > > Thanks > > Daniel > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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