When I talked to Christoph at Linuxcon a couple weeks back he suggested several things that may improve performance on XFS. These are things taht helped with Sheepdog workloads, which are somewhat similar. * mount -o inode64 will keep inodes closer to file data for larger disks. * mount -o filestreams will enable an alternative allocator that works better for fixed sized files, but it should probably used in conjuntion with something that explicitly fallocates rbd objects to 4mb. I have a preliminary branch wip-osd-alloc that puts some of the osd-side bits in place, but it needs some work, including the rbd bit that adds the PREALLOC op to the requests. * mount -o noatime, of course. I forget what else. :) sage -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
