On Mon, Feb 15, 2016 at 04:18:28PM +0100, David Casier wrote: > Hi Dave, > 1TB is very wide for SSD. It fills from the bottom, so you don't need 1TB to make it work in a similar manner to the ext4 hack being described. > Exemple with only 10GiB : > https://www.aevoo.fr/2016/02/14/ceph-ext4-optimisation-for-filestore/ It's a nice toy, but it's not something that is going scale reliably for production. That caveat at the end: "With this model, filestore rearrange the tree very frequently : + 40 I/O every 32 objects link/unlink." Indicates how bad the IO patterns will be when modifying the directory structure, and says to me that it's not a useful optimisation at all when you might be creating several thousand files/s on a filesystem. That will end up IO bound, SSD or not. Cheers, Dave. -- Dave Chinner dchinner@xxxxxxxxxx -- 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
