HP-UX server showing high memory utilization


 
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Operating Systems HP-UX HP-UX server showing high memory utilization
# 15  
Old 11-10-2014
Code:
vmstat 2 10   ##look if you hitting swapping, pi/po values should not be non-zero.
model  ; swlist -l bundle | grep -e QPK -e GOLD

Have you patched the server to it's applicable patches, how old are the GOLD bundles.., This could lead to performance problem too if all of the above are ok.
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# 16  
Old 11-11-2014
Code:
model  ; swlist -l bundle | grep -e QPK -e GOLD
9000/800/rp4440
  GOLDAPPS11i           B.11.11.0812.479 Applications Patches for HP-UX 11i v1, December 2008
  GOLDBASE11i           B.11.11.0812.479 Base Patches for HP-UX 11i v1, December 2008

# 17  
Old 11-12-2014
Will the memory assigned to Buffer cache(dbc_max_pct) can be used by normal process when required or else it will be reserved only for Buffer Cache itself?

How to check the amount of actual memory being used by buffer cache irrespective of the value(dbc_max_pct) assigned to it?
# 18  
Old 11-13-2014
I have checked other servers having the same OS,hardware and almost having same workload.Their buffer cache values are as below. Their utilizations are < 40%. So I hope this buffer cache may be the culprit for displaying high utilization.

Thanks for everyone for your help in this. I cant say this was closed but hope that this may help to close this problem. Let's see what happens if these values are changed.

Code:
Parameter             Current Dyn Planned                    Module     Version
===============================================================================
dbc_max_pct                 9  -  9
dbc_min_pct                 5  -  5

# 19  
Old 11-13-2014
Almost what I sugested in post#14 hehe
My concern is you CSTM output... when was last reboot? after next reboot think too look at cstm / memory to see if the errors are getting worse, if the case the 2GB rAM in slot 1B may need to be changed, but dont worry if he system finds it too bad it will reboot on its own and unconfigure the faulty RAM... ( I wonder if it hasnd already done so... but I have no more HP to see...).
Do teh other boxes have swapmem_on set to 1 ?
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# 20  
Old 11-14-2014
Yes the swapmem_on was set to 1 on other machines too.

It was last rebooted @224 days before

Code:
uptime
 11:38am  up 224 days,  5:44,  1 user,  load average: 0.06, 0.05, 0.04

As I already asked before can you explain about these queries

1. Will the memory assigned to Buffer cache(dbc_max_pct) can be used by normal process when required or else it will be reserved only for Buffer Cache itself?

2. How to check the amount of actual memory being used by buffer cache irrespective of the value(dbc_max_pct) assigned to it?
# 21  
Old 11-14-2014
the min is for minimum cache: whatever memory reclamation is buffers wont go under that value...
So max is to be understood as the maximum buffer cache you let the system have, if there is memory not used that is where it will finish to the value given...
It could release for other programs to do but for that it needs to flush the cache before and that can take some time because lets say it is of 50% of your 24GB that means forcing a 12 GB of immediate write to disk, will / How the SAN cope with that? usually you see in such case a "freeze" of the system ( you know you type and nothing is happening ...) till done... that is why it is resonable to configure that value to what you know you SAN can accept without any trouble ( that means SAN can send an acknowlege almost just after so the buffers can be flushed...)

The system hates to have wasted RAM so if you have unused RAM either it will be used as pseudoswap, or will end as cache unless you dont let it use it ( by reducing e.g dbc_max_pct ...).
If you have JAVA stuff that could run and you are just a little short ( used by cache...) it wont wait for it to be released and exit saying not enough memory...
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