On Sat, Feb 16, 2013 at 10:24 AM, Kevin Decherf <[email protected]> wrote: > On Sat, Feb 16, 2013 at 11:36:09AM -0600, Sam Lang wrote: >> On Fri, Feb 15, 2013 at 7:02 PM, Kevin Decherf <[email protected]> wrote: >> > It seems better now, I didn't see any storm so far. >> > >> > But we observe high latency on some of our clients (with no load). Does >> > it exist any documentation on how to read the perfcounters_dump output? >> > I would like to know if the MDS still has any problem with its cache or >> > if the latency comes from elsewhere. >> >> You can use perfcounters_schema to get the output format in json, >> using something like json_pp to make it somewhat readable for a human. >> You can post the dump output as well and we can try to help you >> parse/understand what its telling you. > > Ok, thanks. > > Here you will find the output of perfcounters_dump on the active MDS: > http://pastebin.com/raw.php?i=BNerQ2fL
Looks like you've got ~424k dentries pinned, and it's trying to keep 400k inodes in cache. So you're still a bit oversubscribed, yes. This might just be the issue where your clients are keeping a bunch of inodes cached for the VFS (http://tracker.ceph.com/issues/3289). -Greg -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
