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# citrix-netscaler
s
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c
ADC Clustering isn't used very often (I built and supported numerous customer environments and never seen it in use) if you are getting close to maximum throughput with your vpx200 license i would either upgrade to a vpx1000 license or look at moving to a MPX with the ability to convert it to a SDX in future you also can use burst packs. How many ICA connections do you have ? how much ssl offloading are you doing?
d
Hello John, thanks for getting back to me. We’ve got around 550 ICA connections, pretty much all services are offloaded.
r
550 ICA connections? My buddy is running 8000 ICA connections on a VPX200 and it's not even breaking a sweat. How are you seeing that you're maxed out?
but, to answer your question, i'd just update it to VPX1000 and add the appropriate cores/RAM based on the sizing guide.
d
It sounds like i need to do some further monitoring, based on previous investigations the majority of traffic is generated by Exchange. I’m occasionally seeing plateformRateLimitPktDrop in the ADM event log.
r
That would make sense. I wouldn't think it would be ICA sessions
d
Yeah thats my thinking.
Much appreciated for the sense check.
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