On 06/14/2018 07:05 PM, John Spray wrote: > On Wed, Jun 6, 2018 at 2:29 PM, Wido den Hollander <wido@xxxxxxxx> wrote: >> Hi, >> >> Previous to Luminous you could run 'ceph -w' and get a continues output >> of how the cluster is performing. You would get IOps and such. >> >> To get this done with Luminous you need to do something like: >> >> $ watch ceph -s >> >> Although this works it is less efficient then -w used to be: >> >> 1. Spawn Python interpreter >> 2. Create connection with the MON(s) >> 3. Fetch OSDMap >> 4. Fetch statistics >> >> And do this all every 2 seconds (or which interval you set). >> >> So I was thinking about this: >> >> $ ceph -s <interval> >> >> If you provide a interval the process will not exit but it will refresh >> the screen every X seconds while keeping the Python interpreter live and >> also keep the MON connection imitated. >> >> It's actually just running the mon command 'status' every X seconds and >> refreshing the screen. >> >> Although we have the 'iostat' Mgr module in Mimic it doesn't do exactly >> the same as status does. >> >> I think it's the status Mgr Module which is responsible for this, isn't it? > > The status module is something else (the "fs status" and "osd status" > commands, and any other handy things anyone wanted to add). > > If one literally just wants a live-refreshed view of "ceph -s", then > "watch ceph -s" is IMO quite reasonable, and not inefficient enough to > justify creating a built in version (unless we're feeling the pain of > the continuous reconnections in a way that I haven't thought of?) > > However, I could see the need for some variations on the theme of the > iostat command, that had more of the health and status info > (especially pg states) rather than performance-focussed output. I > find the line-streaming output more handy than a full screen refresh, > because I have a few lines of history on the screen. > Yes, that's why I liked the old 'ceph -w' as I would keep my updated on how the cluster is performing. Instant PG updates, something you really want to know while you are in the middle of a situation. Can Mgr modules stream output instead of refreshing? Wido > John > >> >> Wido >> -- >> 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 -- 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
