2011/7/28 Gregory Farnum <gregory.farnum@xxxxxxxxxxxxx>: > On Wed, Jul 27, 2011 at 9:05 AM, Gregory Farnum > <gregory.farnum@xxxxxxxxxxxxx> wrote: >> The doubled writes can be annoying, but it's really the only safe >> thing to do. Perhaps we could do something with btrfs and snapshots to >> avoid using a journal, but I'd have to look into it some more. > Actually this already works -- you are data safe if you run btrfs > without a journal. Apparently it's even slower, though -- you need to > go through a lot more syncs to guarantee your data safety. > we use btrfs and without journal, it turns out that : the performance of big write(10GB) is good, but the rm dir ops goes slow. So we reset the value of "filestore max sync interval = 0.1", the rm dirs rate increased. Does this related to version of ceph kernel Client and kernel ? Can we promote the DIR ops performance on OSD end? > So your best bet if it's a real problem is to add a fast disk to use > as your journaling device. > -- 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
