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Unable to Change Kernal Parameter for HPUX 11.11

 
Johnson Punniyalingam
Honored Contributor

Unable to Change Kernal Parameter for HPUX 11.11

Hi All,

Could any advice me on this issue,

I am unable Change any Kernal Parameter for HPUX 11.11,resulting in Software Problem

Server Discription:-
OS: B.11.11, HW: 9000/800/L3000-5x RAM: 1536 MB

Please let me know what are the required information needs to be provided.

Thanks,
Johnson
Unix-Team
Problems are common to all, but attitude makes the difference
8 REPLIES
Steven Schweda
Honored Contributor

Re: Unable to Change Kernal Parameter for HPUX 11.11

> I am unable Change [...]

I am unable to guess what you tried, or what
happened when you tried it.

> Please let me know what are the required
> information needs to be provided.

How about these?

What you wish to do.
What you did.
What happened when you did it.

"I can't do something" is not a useful
problem report.


Doesn't "sam" provide a tool for changing
kernel parameters? Some parameters are
dynamic (changes take effect immediately),
and some are not (changes take effect after
reboot). Trying to guess what you don't know
is not my idea of a good time.
Johnson Punniyalingam
Honored Contributor

Re: Unable to Change Kernal Parameter for HPUX 11.11

>>am unable to guess what you tried, or what
happened when you tried it.<<

> Please let me know what are the required
> information needs to be provided.

How about these?

What you wish to do.?
>> I wish to do change static kernal parameter (nfile valuse from 1200 to 1300).

What you did.?
>> Use SAM ->Kernal Configuration ->select->nfile-->modify->
>>Server sucesfully backuped up my old.kernal and rebuilded new keranl -> after reboot

What happened when you did it.

>>COnsole message "SOFTWARE Failure "
>>Hence Its production Servers<< I am beyond my downtime schedule<

>>I reboot in Single User mode< Booted the Server using ISL> hpux boot /stand/vumix.prev

Than the Server booted as per normal "

#cp vmunix vumix.prev
#shutdown -ry 0

>>"I can't do something" is not a useful
problem report.<<

Hope This Helps

Thanks,
Johnson
Problems are common to all, but attitude makes the difference

Re: Unable to Change Kernal Parameter for HPUX 11.11

>I wish to do change static kernel parameter (nfile value from 1200 to 1300).

So what happened when you did? Note this is still very small.

>Console message "SOFTWARE Failure"

This isn't helpful. This happened when you ran your application or when you rebooted?
If the former, was nfile changed to 1300?
Johnson Punniyalingam
Honored Contributor

Re: Unable to Change Kernal Parameter for HPUX 11.11

>I wish to do change static kernel parameter (nfile value from 1200 to 1300).

So what happened when you did? Note this is still very small.

>>Server unable to boot, Console message showed up Software Failure.<<

>Console message "SOFTWARE Failure"

This isn't helpful. This happened when you ran your application or when you rebooted?

This Happened Once Server reboot after the kernal parameter change.<<<

If the former, was nfile changed to 1300?

No, That was the Customer ,issue they are not able to change any kernal paremeters in this Box.

so I requested downtime from the Customer and adviced we shall try changing any static kernal parameter.

So please advice why does it doesn't allow me to change any kernal parameter values?

Thanks,
Johnson
Problems are common to all, but attitude makes the difference
Roopesh Francis_1
Trusted Contributor

Re: Unable to Change Kernal Parameter for HPUX 11.11

The default value is computed at runtime and depends on the amount of physical memory on the system. For small memory systems (less than 1GB), the default is 16384, or 16K. For systems with more than 1GB of memory, the default is 65536, or 64K.

The minimum value allowed is 2048. The maximum value allowed is the maximum 32-bit signed integer value that can be represented in the system. The value is further constrained in that it must be equal to or greater than two times the per-process open file hard limit: (nfile >= 2*maxfiles_lim).

please check the /etc/conf/master.d/core-hpux for range specified for nfile.can you try with kmtune instead of sam and post the output

Re: Unable to Change Kernal Parameter for HPUX 11.11

>Server unable to boot, Console message showed up Software Failure.

This is useless, it doesn't tell who or what.
Can you provide 10+ lines of context?

Try changing nfile to at least 16384.

Johnson Punniyalingam
Honored Contributor

Re: Unable to Change Kernal Parameter for HPUX 11.11

>>This is useless, it doesn't tell who or what.
Can you provide 10+ lines of context?<<

It showed up inthe Console , mentioned earlier, was unable to capture becoz was using dump terminal .........

Thanks,
JOhnson
Problems are common to all, but attitude makes the difference
Johnson Punniyalingam
Honored Contributor

Re: Unable to Change Kernal Parameter for HPUX 11.11

Thx
Problems are common to all, but attitude makes the difference