Hi all, I have a ceph cluster(0.80.7) in production. Now I encounter a bottleneck of iosp, so I want to add a cache tier with SSDs to provide better I/O performance. Here is the procedure: 1. Create a cache pool 2. Set up a cahce tire ceph osd tier add cold-storage hot-storage 3. Set cache mode ceph osd tier cache-mode hot-storage writeback 4. Direct all client traffic from the storage pool to the cache pool ceph osd tier set-overlay cold-storage hot-storage There are about 1000 vms(kvm with rbd). Can I do this on the fly without stopping any vm? By the way, all the datas is about 100T, is the cache tier 5T enough? Any help, is highly appreciated. Thanks! _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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