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12-02-2012 11:26 PM
12-02-2012 11:26 PM
Buffer Cache Utilization is very high on RX2660
I have RX2660 server HP-UX Base OE ( 11.31 ); so no glance software available.
I have noticed that VM utilization is always 84% and above, but swap and memory utilization is below 30%.
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 8192 210 7982 3% 0 - 1 /dev/vg00/lvol2
reserve - 866 -866
memory 11667 3523 8144 30%
total 19859 4599 15260 23% - 0 -
Below output taken on 1st of October.
| | Sec |Cache Mem | User | | Active |
Date | Time |/Intvl | Hit % | Mem %| Swap %| VM % |
10-01-12 |13:10:00| 300.0| 100.00| 30.75| 41.00| 83.90|
10-01-12 |13:15:00| 300.8| 100.00| 30.75| 41.00| 84.38|
10-01-12 |13:20:00| 300.0| 100.00| 30.75| 41.00| 84.23|
10-01-12 |13:25:00| 299.3| 100.00| 30.75| 41.00| 83.95|
10-01-12 |13:30:00| 300.0| 100.00| 30.75| 41.00| 84.19|
This system is using as Data Protector Cell server. System has 12GB memory with 8GB Swap space configured.
What could be the problem? What's the solution? Appreciate your valuable inputs.
Shibin
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12-03-2012 11:04 AM - edited 12-03-2012 11:05 AM
12-03-2012 11:04 AM - edited 12-03-2012 11:05 AM
Re: filecache Utilization is very high on RX2660
(I assume you mean filecache for 11.31.)
>Below output taken on 1st of October.
What produced this output? And did the swapinfo occur at the same time?
>What could be the problem?
Why do you think there is a problem? Something not working or slow with the system?
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12-05-2012 06:54 AM
12-05-2012 06:54 AM
Re: filecache Utilization is very high on RX2660
Hi Dennis,
Thanks for the response. Yes. This is HP-UX 11.31 BASE OE ( no glance available ) with Sept 2010 patch level.
The given report is taken from perf ( using OVPA extract tool ). As you can see here, Cache memory and Virtual memory in its peak and the monthly performance report is ( graph ) is giving very bad report.
Any possible solution ? I am thinking a patch level update; but I do not have relevent evidence to convey that patch update will resolve the issue.
Thanks in advance.
Shibin
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12-05-2012 08:30 AM
12-05-2012 08:30 AM
Re: filecache Utilization is very high on RX2660
>monthly performance report is (graph) is giving very bad report.
Again, why do you think this is bad?
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12-05-2012 09:12 AM
12-05-2012 09:12 AM
Re: filecache Utilization is very high on RX2660
It's DP cell server. When all backup trigger during night time ( server time is CET ), Data Protector GUI becomes crawling.
That's the simplest way I can explain.
Shibin
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12-05-2012 10:38 AM
12-05-2012 10:38 AM
Re: filecache Utilization is very high on RX2660
>Data Protector GUI becomes crawling. That's the simplest way I can explain.
That's, that's more useful info.
Anything else running on the server? You may need more memory.
Can you get the vmstat(1) output? Are the po/pi values high?
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12-06-2012 12:56 AM
12-06-2012 12:56 AM
Re: filecache Utilization is very high on RX2660
Paging is very low level all the time.
procs memory page faults cpu
r b w avm free re at pi po fr de sr in sy cs us sy id
2 0 0 325629 497473 0 0 7 1 0 0 0 37262 22620 8316 9 3 88
2 0 0 325629 497242 0 0 4 0 0 0 0 1605 31237 272 20 3 77
2 0 0 334296 497233 0 0 2 0 0 0 0 1594 32423 338 27 1 72
2 0 0 334296 497217 0 0 0 0 0 0 0 1599 25125 344 27 0 73
2 0 0 334296 497265 0 0 0 0 0 0 0 1621 19222 339 11 0 89
It's very strange, I think, and just virtual memory is high. There are no other applicaiton installed other than Data Protector and HP OVO tools.
I am going to extract another report for this month to see the activity. System has currently 12GB memory and suggestions came to add another 8GB. However, I need to re-consider that option because if additional memory is not giving expected output, then the expenditure made will be in question.
Shibin
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12-06-2012 02:14 PM - edited 02-02-2013 05:06 AM
12-06-2012 02:14 PM - edited 02-02-2013 05:06 AM
Re: filecache Utilization is very high on RX2660
>Paging is very low level all the time.
Then it isn't a memory bottleneck.
>Data Protector GUI becomes crawling
What's crawling? GUI updates?
Or backup progress? If the latter, it could be I/O or networking bottlenecks?
>This system is using as Data Protector Cell server.
What exactly does a Cell server do? (I.e. What resources does it use/need?)
The source (disks) to backup?
Something to collect data from other systems?
>because if additional memory is not giving expected output, then the expenditure made will be in question.
Here is where glance is important. Do you have the trial version available?
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12-06-2012 10:54 PM
12-06-2012 10:54 PM
Re: filecache Utilization is very high on RX2660
Thanks for your response. I have diverted my investigation to application level and found these lines in Omni debug.log file.
ipw_getaddrinfo(servername.domain.com) Network performance warning: took 15.000000 sec
ipw_getaddrinfo(servername.domain.com) Network performance warning: took 15.000000 sec
ipw_getaddrinfo(localhost) Network performance warning: took 20.000000 sec
Note: servername.domain.com - used here to hide original name.
Now, it seems more related to Network issue.
But why just VM is above 85% and all other at normal ?
Shibin
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12-07-2012 12:11 AM
12-07-2012 12:11 AM
Re: filecache Utilization is very high on RX2660
>it seems more related to Network issue.
Yes.
>But why just VM is above 85% and all other at normal?
I think the title is "Active VM %", which I'm not sure what it means. If it means "used", I'm not sure why it didn't say that.
I do find "Active VM" on a glance output in:
The HP-UX 11i v3 Memory Management Subsystem
h20000.www2.hp.com/bc/docs/support/SupportManual/c02465072/c02465072.pdf
Page 4 seems to imply that "active' means "belonging to a process that is running or has run in the last 20 seconds".
This could mean that 85% of the "USED" VM is active?