Ceph » devops

Defaults for XFS, from an email from Sage:

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.