topic TCPIP & Socket Limitation in Operating System - OpenVMS

TCPIP & Socket Limitation

Jorge Cocomess — Wed, 01 Feb 2006 19:40:27 GMT

Gretings,
Within VMS 7.3-2. Is there limitation on number of open sockets? We have number of users were dropped connecting through via network to the VMS server. I thought I've heard awhile back about number of TCPIP Socket limitation within VMS. Where can I check for this? Any ideas?

Thanks,
J

Re: TCPIP & Socket Limitation

Andy Bustamante — Wed, 01 Feb 2006 20:34:59 GMT

What TCPIP product are you using? With TCPIP 5.4 (provided with VMS 7.3-2) the default behavior is 9999 BG devices. You can enable the scalable kernel
http://h71000.www7.hp.com/doc/732FINAL/TCP_RN/TCP_RNPRO.HTML

You can also use the sysconfig utility, see http://h71000.www7.hp.com/doc/732final/6631/6631pro.html for much more details.

Check the system parameter CHANNELCNT as well.

Andy

Re: TCPIP & Socket Limitation

Jorge Cocomess — Wed, 01 Feb 2006 21:48:48 GMT

Andy - How do you go about checking the "CHANNELCNT"? If so, at what point do I check this, when the users on the system or at any given time? As you can tell, I am new with VMS and I can use much help.

Thanks for your time.

J

Re: TCPIP & Socket Limitation

Jorge Cocomess — Wed, 01 Feb 2006 22:07:44 GMT

Here's the screen shot of the CHANNELCNT, SYSGEN> SHO CHANNELCNT
Parameter Name Current Default Min. Max. Unit Dynamic
-------------- ------- ------- ------- ------- ---- -------
CHANNELCNT 2446 256 31 65535 Channels

I'm currently using;
HP TCP/IP Services for OpenVMS Alpha Version V5.4 - ECO 2
on a AlphaServer ES45 Model 2 running OpenVMS V7.3-2

What else should I check?

Thanks,
J

Re: TCPIP & Socket Limitation

Karl Rohwedder — Thu, 02 Feb 2006 01:01:43 GMT

Pls. habe a look at the appropriate manual at
http://h71000.www7.hp.com/doc/732final/documentation/pdf/aa-lu50m-te.pdf

There are many hints to system parameters such as CHANNELCNT...

regards Kalle

Re: TCPIP & Socket Limitation

Wim Van den Wyngaert — Thu, 02 Feb 2006 02:41:15 GMT

For monitoring the channels of each process I do :
ana/sys
>set proc/id=xxx
>eval @ctl$GL-CHINDX

en compare that with f$getsy("channelcnt".

The ana/sys reports a high water mark but I want an alarm when the problem occured in the past too.

For the maximum sockets :
ana/sys
> tcpip sho inetcb/stat

and look for statistics on sockets.
Wonder why they removed that from the show commands (ucx).

(ana/sys must be coming from Volker)

Wim