> How much performance can be improved if use SSDs to storage journals? You will see roughly twice the throughput unless you are using btrfs (still improved but not as dramatic). You will also see lower latency because the disk head doesn't have to seek back and forth between journal and data partitions. > Kernel RBD Driver , what is this ? There are several RBD implementations, one is the kernel RBD driver in upstream Linux, another is built into Qemu/KVM. > and we want to know the RBD if support XEN virual ? It is possible, but not nearly as well tested and not prevalent as RBD via Qemu/KVM. This might be a starting point if your interested in testing Xen/RBD integration: http://wiki.xenproject.org/wiki/Ceph_and_libvirt_technology_preview Hope that helps! -- Kyle _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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