> Op 3 juli 2017 om 13:01 schreef Mateusz Skała <mateusz.sk...@budikom.net>: > > > Hello, > > We are using cache-tier in Read-forward mode (replica 3) for accelerate > reads and journals on SSD to accelerate writes. We are using only RBD. Based > on the ceph-docs, RBD have bad I/O pattern for cache tier. I'm looking for > information about other possibility to accelerate reads on RBD with SSD > drives. >
I would recommend using bcache in front of your OSDs. Other ways to get latency down on RBD: - 10G networking - Faster CPUs - Disable all logging in Ceph - Disable power saving on CPUs (C state 0) Wido > The second question, is it any cache tier mode, that replica can be set on > 1, for best use of SSD space? > > > > Best Regards > > -- > > Mateusz Skała > > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
