Hi, We use write-around cache tier with libradosstriper-based clients. We faced with bug which causes performance degradation: http://tracker.ceph.com/issues/22528 . Especially if it is a lot of small objects - sizeof(1 striper chunk). Such objects will promote on every read/write lock:). And it is very hard to benchmark cache tier.
Also, we have a little testing pool with rbd disks for vm's. It works better with cache tier on ssd's. But, there's no heavy i/o load. It's better to benchmark cache tier for your special case and choose cache mode based on benchmark results. 06.03.2018, 02:28, "Budai Laszlo" <laszlo.bu...@gmail.com>: > Dear all, > > I have some questions about cache tier in ceph: > > 1. Can someone share experiences with cache tiering? What are the sensitive > things to pay attention regarding the cache tier? Can one use the same ssd > for both cache and > 2. Is cache tiering supported with bluestore? Any advices for using cache > tier with Bluestore? > > Kind regards, > Laszlo > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- Regards, Aleksei Zakharov _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
