Hello All, Currently running a CEPH cluster connected to KVM via the KRBD and used only for this purpose. Is working perfectly fine, however would like to look at increasing / helping with random write performance and latency, specially from multiple VM's hitting the spinning disks at same time. Currently have journals on SSD so helps with a very short burst, however looking into putting some proper SSD "cache" in front. I have read that in the past the cache tiering hasn't been great, however has improved some what in recent releases and if setup correctly works well once tuned. However as I want to make sure what choice and hardware I put in place will last for a while / future releases, does SSD cache work / going to work with the new BlueStore? Or am I better off creating a SSD Pool and placing the OS Disk on this and using the standard pool as anything non OS related such as /home partitions e.t.c (bigger overhead on the configuration side per a VM) Basically my questions are: 1/ Will cache Tier continue to be supported for versions to come and in new backend format. 2/ I currently run at 3 replication, is it safe to run replication 2 for SSD cache while using Write Back while using DC grade SSD? 3/ Anything I should be aware of when looking into caching? Thanks for your time!, Ashley _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |