On Tue, Jul 03, 2012 at 10:09:33AM -0700, Sage Weil wrote: > The OSD keeps directories small on its own by breaking the contents of > large directories into smaller subdirectories. Right, that's what I remembered. At least for XFS that'll actually give you much worse allocation patters as each new directory rotates to a new allocation group. > That said, on one system we did see what looked like crazy bad > fragmentation on an XFS directory... it had maybe 5 subdirs in it and many > many blocks. That was probably shortly after it had been big and rehashed > its contents into the subdirs. Yehuda probably remembers more. Another reason why not doing the artifical directories is better... > In any case, is there a way to prod XFS into defragging a specific > directory? No. XFS can only defragment regular files at the moment. -- 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
