On 12/20/2016 02:29 PM, Wido den Hollander wrote:
Op 20 december 2016 om 5:19 schreef Shubhendu Tripathi <shtripat@xxxxxxxxxx>:
Hi Team,
Our team is currently working on project named "tendrl" [1][2].
Tendrl is a management platform for software defined storage system like
Ceph, Gluster etc.
As part of tendrl we are integrating with collectd to collect
performance data and we maintain the time series data in graphite.
I have a question at this juncture regarding pool utilization data.
As our thought process goes, we think of using output from command "ceph
df" and parse it to figure out pool utilization data and push it to
graphite using collectd.
The question here is what is/would be performance impact of running
"ceph df" command on ceph nodes. We should be running this command only
on mon nodes I feel.
Correct, that data comes from the MONs and is not that heavy.
Wanted to verify with the team here if this thought process is in right
direction and if so what ideally should be frequency of running the
command "ceph df" from collectd.
Running the command means forking a process every time and also going through the whole cephx authentication and client <> MON process.
This is just from our point of view and we are open to any other
foolproof solution (if any).
The best would be to keep a open connection to a MON and run the 'df' command directly on the MONs in a loop.
I wrote something like that in Python a while ago for 'ceph status': https://gist.github.com/wido/ac53ae01d661dd57f4a8
cmd = {"prefix":"status", "format":"json"}
If you change that to:
cmd = {"prefix":"df", "format":"json"}
You ask the MON for 'df' and get back a JSON. Run that in a loop where you sleep every 1 or 5 seconds and you should have very real-time information.
Thanks Wido. This is for sure a good suggestion.
I would try to incorporate this and test once.
Regards,
Shubhendu
Wido
Kindly guide us.
Regards,
Shubhendu Tripathi
[1] http://tendrl.org/
[2] https://github.com/tendrl/
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