Open VMS VAx 7.1 Mailbox index number

[Rajarshi Gupta]

Do you please let me know the maximum index number of VMS mailbox in OPEN VMS VAX 7.1. The VMS mail boxes are used for inter process communications.

[Ian Miller.]

I think MBA9999 is the limit for V7.1.
I seem to remember this being raised to 32000 in a recent version of VMS but can't find the reference at present.

[Rajarshi Gupta]

Can any body please confirm in which version of Opne VMS VAX the maximum mail box number is raiesd to 32000.

[Kris Clippeleyr]

According to my info (picked it up during the TUD held in October 2004), the maximum number is 32767 starting from OpenVMS Alpha V7.3-2. I don't think engineering increased this number for any flavor of OpenVMS VAX.
Regards,
Kris (aka Qkcl)

[Rajarshi Gupta]

Hi,

Any one can please forward link for this, where the details of maximum nubmer of mail boxes in Open VMS explained

[Volker Halle · Accepted solution]

Rajarshi,

here is a pointer to the presentation from the German TUDs 2004:

http://www.decus.de/sig/vms/TUD_2004/Hints.pdf

On page 5 you'll find:

V7.3-2 Unit Limits Increasedâ ¦
â ¢Increase limit from 9999 to 32767 units
â Used for MB (mailbox) and BG (IP) devices


I could not (yet) locate a reference in the V7.3-2 release notes.

[Kris Clippeleyr]

See:
info on $CREMBX at
http://h71000.www7.hp.com/doc/732FINAL/4527/4527pro_001.html#index_x_245
and info on $GETDVI at
http://h71000.www7.hp.com/doc/732FINAL/4527/4527pro_004.html
And for additional info on the TCP/IP scalable kernel, and number of supported BG devices, see:
http://h71000.www7.hp.com/doc/732FINAL/TCP_RN/tcp_rnpro_001.html#bg_devices
Regards,
Kris (aka Qkcl)

[Ian Miller.]

To use a famous phrase "what problem are you trying to solve?" Are you just curios as to what the limit is or do you have a system which you think is running into this limit?

[Rajarshi Gupta]

Yes I have a system which has reached in this limit and necessary to increase further

[Volker Halle]

Rajarshi,

consider upgrading to OpenVMS Alpha or Itanium. Don't expect this feature to ever show up on VAX...

Volker.