AIX 6.1 reach the threshold of stream(no -a|grep strthresh) Post: 302770905

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Operating Systems AIX AIX 6.1 reach the threshold of stream(no -a|grep strthresh) Post 302770905 by MichaelFelt on Tuesday 19th of February 2013 02:31:39 AM

02-19-2013

Registered User

Quote:

and now i suspect the problem is network issue but i don't know how to affirm that.

I have been approaching this as an AIX configuration issue because changing a setting has helped it "go away". Needed: better definition of what you mean by "network issue".

Some data during/after the problem (during - repeating commands to look for deltas helps pin-point what the system is trying to say).

Sort of: no Pain, no Gain.

In any case - real data values - during a backup are needed to know if we are looking at this properly.

FYI: not sure what the limits are these days. Back when CHRP (Common Hardware Reference Platform) first came out IP buffers were limited to 4x 256MB memory, or 1G - up to 50% of memory (so, when more than 2G of memory, maximum was 1G)
no -o thewall tells us the HW limit (1k value) - so roughly, drop 6 digits, and you get the GByte value - on my system with 9G - that makes it near 50% still.

Your number: thewall = 47448064 goes down to 47.
I do not see this as being your limiting factor - unless it is conflicting with something else. However, there is a second variable to set a limit under thewall.

Quote:

You can also use the maxmbuf tunable to lower the thewall limit. You can view the maxmbuf tunable value by running the lsattr -E -l sys0 command . If the maxmbuf value is greater than 0 , the maxmbuf value is used regardless of the value of thewall tunable.
The default value for the maxmbuf tunable is 0. A value of 0 for the maxmbuf tunable indicates that the thewall tunable is used. You can change the maxmbuf tunable value by using the chdev or smitty commands.

Hope this helps moving forward!

MichaelFelt

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LEARN ABOUT HPUX

audit_memory_usage

audit_memory_usage(5)						File Formats Manual					     audit_memory_usage(5)

NAME

       audit_memory_usage - percentage of physical memory that can be used by audit subsystem

VALUES

   Failsafe
   Default
   Allowed values
   Recommended values
DESCRIPTION

       The  tunable  defines  the  percentage  of physical memory that can be used by audit records.  If the audit record memory usage exceeds the
       limit, the audit subsystem blocks the system call until memory usage comes down inside the limit.

   Who Is Expected to Change This Tunable?
       Administrator with proper privileges can change the value of

   Restrictions on Changing
       This tunable value can be changed any time, as this is a dynamic tunable; but its value can not be lowered below the memory currently  used
       by the audit subsystem for records.

   When Should the Value of This Tunable Be Raised?
       When the system to be audited is critical and generates many records.

   What are the Side Effects of Raising the Value?
       If  the	system is generating great number of records, and the value is raised, then it can create a lot of unflushed memory and might slow
       down the system.

   When Should the Value of This Tunable Be Lowered?
       When the audit subsystem is not generating many records.

   What are the Side Effects of Lowering the Value?
       If many audit records are generated, then the auditing subsystem might block the system call.

   What Other Tunable Values Should Be Changed at the Same Time?
       None.

WARNINGS

       All HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases	of
       HP-UX.

       Installation  of  optional  kernel  software, from HP or other vendors, may cause changes to tunable parameter values.  After installation,
       some tunable parameters may no longer be at the default or recommended values.  For information about the effects of installation  on  tun-
       able  values,  consult  the documentation for the kernel software being installed.  For information about optional kernel software that was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

SEE ALSO

       audit(5).

							     Tunable Kernel Parameters					     audit_memory_usage(5)