On Sun, Nov 21, 2010 at 1:14 PM, Ravi Pinjala <pstatic@xxxxxxxxx> wrote: > Watching my cluster nodes with gkrellm, it seems like there's some > inexplicable background write activity going on at a rate of about 1-4 > MB/s. As far as I can tell, this starts any time there's disk activity > (even if there's very little activity), and continues for a minute or > so after. Does anybody know what this could be? There's a few possibilities. It could just be the MDS flushing out its journal. If you have any logging on that will also add to the amount of data being moved around. Although I'm not sure either of those would be generating 1-4MB/s for 60 seconds on just a few metadata ops or whatever. > I'm actually starting > to worry about the life of my disks, since they're constantly writing > when they should otherwise be idling. Hmm, the disk studies I've seen indicate that disk activity has very little impact on longevity. -Greg -- 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
