Upgrade RAM for HP-UX

[Former Member]

Dear Expert,

Need helps....

We currently want to upgrade RAM for HP-UX for running SAP R/3 Enterprise 4.7.

My question, Are there any OS kernel parameter value must be change in relationship with RAM changes?

Thanks...

Regards,

Yansen

Edited by: yansen johannes on Apr 6, 2010 1:43 PM

[Former Member]

Dear Joe,

I think the related OS kernel parameter for RAM are shmmax and maxdsiz_64bit.

Is it correct?

Thanks...

Yansen

[Former Member]

Afaik you have to adjust shmmax.

But I wouldn't change maxdsiz_64bit.

Have a look at man maxdsiz in Unix:

When Should the Value of This Tunable Be Raised?
      This tunable should be raised if user processes are receiving the
      [ENOMEM] error message:

[Former Member]

By the way, I suppose you did consider swap space:

SAP Note 1112627 - SAP on HP-UX: Recommendations for swap and pseudo swap

[Former Member]

Dear Joe,

Could you tell me how to monitor system status for the error?

Thanks...

Yansen

[Former Member]

Hello Yansen,

not sure about this. I never did deliberately monitor system status for this error in HP-UX.

But there are the usual suspects like file /var/adm/syslog/syslog.log.

And listen whenever a user is reporting a strange error message.

What I wanted to say: I wouldn't change parameter maxdsiz_64bit, unless I really have to. And I trust that I will notice when I really have to.

But maybe it's only me.

hope this helps

[Former Member]

Hi,

You need to consider two things one is swp need to increase and the other OS kernel parameter is shmmax.

Thanks,

Chaitanya

[Former Member]

For a start:

SAP Note 172747 - SAP on HP-UX: OS kernel parameter recommendations