2012/11/3 Gregory Farnum <greg@xxxxxxxxxxx>: > No, of course it will flush data to the disk at the same time as it > will take writes to the journal. However, if you have a 1GB journal > that writes at 200MB/s and a backing disk that writes at 100MB/s, and > you then push 200MB/s through long enough that the journal fills up, > then you will slow down to writing at 100MB/s because that's as fast > as Ceph can fill up the backing store, and the journal is no longer > buffering. Ok, now it's clear. But in case of a 100GB SSD, the journal size should be enough to allow a proper write to disks -- 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
