[Xymon] Xymon performance scaling problems for Solaris zones?

[Mills, David (IS)]

Hi, all...

We've been running Xymon (4.3.3 -- yes, old, old, old...) very successfully for the last several years in our environment, but have run into a performance snag recently.

We run Xymon on all our Solaris zones -- up to 10 zones + the global zone, at a time. Recently we've started configuring new Oracle LDOMS (64 x SPARC T5-8 processors / LDOM) with > 20 Solaris zones / LDOM and we're seeing that after about 10 zones, Xymon starts to hog CPU in a non-linear way, making the zones unusable.

Specifically, it's not any of the "Xymon" daemons, but it's all the concurrent "vmstat" and "iostats" that are racking up the CPU cycles.

We understand we have several options available including instantiating processor sets and pools, ulimits, etc, but we wanted to know if:

a) Anyone else has had to navigate this problem with such a large number of concurrent *stat commands

b) Is it possible / advisable to monitor zones via Xymon using only a single instance of Xymon running in the global zone, or possibly a representative local zone?

The LDOMs all run Solaris 11, FWIW.

TIA for any tips!

david

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David Mills
Systems Administrator
Northrop Grumman
(512) 873-6665
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