Disk performance problem

Hi all,
We are experiencing an issue that makes no sense to me. We removed 4 drives from ASP2 and moved them to ASP1 two weekends ago. We had some random performance issues along with a seize lock on a journal (for XI). We thought the performance had gotten somewhat better after running the program to turn off dbmon on our 4.7 system. So we set the option to turn dbmon off the next time the system was restarted.
Last weekend we IPL'd to clear the seize lock on the XI Journal. Since then we have noticed that the % busy on one of the 4 drives we added was at 100% and the other 4 were very spikey but often sat at 100% also. They also appeared to have filled up to a higher percent full than the other 132 disks.
We have a pmr open and have set the option to prevent disks writing new data to the disks as recommended. We are also attempting to move the data off of these 4 disks. The move was going somewhat ok until they got to around 50% and now the percent busy is back to 100% on the one disk and only 1% of the data has moved off in the last 8 hours.
Performance has been like a roller coaster since sunday when the IPL took place. We'll move along fine for a few minutes then it's like the system stalls.
We're still going to continue working with IBM but I was wondering if anyone else has experienced anything like this? It goes against my understanding of how the iseries handles disk management. I'd also like to be sure we understand how to prevent this in the future and be able to explain it to our management. So in the unlikely event anyone else has experieinced this please fill me in.
Until it's resolved I'm not even positive that the way the disks are behaving is the problem but it seems like the most likely cause.
We're on V5R4M0 and all of the 136 disks are 70 GB drives.
Thanks,
Craig

Hello Craig,
I used to adjust the disk configuration only during downtime (restricted mode most of the time), start and Finish the ASP balancing before starting SAP.
I guess - What happened in your situation could be the case that i5/OS put most of the new objects (temporary objects, IFS files, DB pages, etc) on those 4 drives, which made them almost 100% from time to time, and rebalancing just add more requests before releasing the workload...
Typically IBM support on i5/OS is very knowledge and gives good solutions. Besides what you mentioned before, a full system save/restore should automatically balance the disks, from what I remember.
Best regards,
Victor

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Message was edited by:
antti.koskinen

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A suggestion: if you use the code tags with your output it will be a great deal easier to read.
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2/md3500 55.0 313.0 2397.5 2425.9 0.0 1.2 3.2 0 93
2/md3600 0.1 19.2 0.8 1440.0 0.0 0.1 5.4 0 10
2/md3700 3.1 0.8 48.8 35.7 0.0 0.0 9.3 0 4
2/md3800 300.4 0.7 30651.9 69.4 0.0 2.6 8.7 0 92
2/md3900 359.9 0.7 35876.8 56.6 0.0 3.3 9.1 0 95
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Here I only want to collect information from people who either know that some things works considerably faster in the previous release or who notice that Aperture 1.1 really slows down after some time of use.
Enough said, here is my information:
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Again, please only post here if you're experiencing any of the mentioned problems and please try to keep your information as condensed as possible. This thread is about collecting data, there are already enough other threads where the specific problems (or other general speed issues) are discussed.
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Bit of a guess this, but is this what is causing people system's problems ? As i said if i left my quad alone for 4 minutes all returns as normal. Its just not normal to think it will ever end, so you do more and compound the slow-down ?
In the interests of research i did another project migrating 245 8MB raws to the 1.1 algorithum and it took 8 minutes. First 5mins consumed 1GB of virtual memory over 20 threads at average 250% CPU usage for Aperture alone. The last three minutes saw the cpus ramp higher to 350%, virtual memory increase to 1.2GB. After the 8 minutes all returned to nornal and fans slowed down (excellent fan/noise behaviour on these quads).
Is this what others are seeing ?
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If i get time i'll try and compare to my MBP.

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Some initial results of converting a single 1.9MB Excel spreadsheet to Numbers:
_Results using Numbers v1.0_
Import 1.9MB Excel spreadsheet into Numbers: 7 minutes 3.5 seconds
Load (saved) Numbers spreadsheet (2.4MB): 5 minutes 11.7 seconds
_Results using Numbers v1.0.1_
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Load (saved) Numbers spreadsheet (2.4MB): 5 minutes 5.8 seconds
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Excel loads the original 1.9MB spreadsheet in 4.2 seconds.
Summary
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Hello
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As it is very long, Apple treats it as the TRUE description of the document and so, each time it must display something, it must work as the interpreters that old users like me knew when they used the Basic available in Apple // machines.
Addind a supplemetary stage would have add time to the opening sequence but would have fasten the usage of the document.
Of course, it would also had added a supplementary stage duringthe save it process.
I hope that they will adopt this scheme but of course I don't know if they will do that.
Of course, the problem is quite the same when we import a document from Excel or from AppleWorks.
The app reads the original which is stored in a compact shape then it deciphers it to create the XML code. Optimisation would perhaps reduce a bit these tasks but it will continue to be a time consuming one.
Yvan KOENIG (from FRANCE dimanche 27 janvier 2008 16:46:12)

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block fetch(SQLFetchScrolll). I use ODBC for this purpose. The
first fetch takes a lot of time, around 50 seconds or so for 2
lakh records. Any ideas how to optimise the same ???
Best Regards,
Vignesh

Performance Problems PrPro CS5 - Upgrade to CS6?

Hi
we often notice massive performance problems with PrPro CS5 here.
e.g. last week we were shooting with a Sony NEX-VG10. (MediaInfo:)
Format: AVC
Format profile: [email protected]
Format settings, CABAC: Yes
Format settings, ReFrames: 2 frames
Format settings, GOP: M=2, N=13
Bit rate: 16.0 Mbps
Width: 1 920 pixels
Height: 1 080 pixels
Display aspect ratio: 16:9
Frame rate: 25 fps
After linking footage into PrPro plaback stutters.
PrPro is very often not responsive to the keyboard at all.
Sometimes PrPro needs some seconds before playback starts.
This way editing is a pain...
No fx in timeline, only one or two clips. Same behaviour if I play a clip in the source window.
Project and sequence settings are correct. Playback quality set to 1/4.
These problems occure in several projects with footage from different cameras.
PrPro works ok with this (PAL/SD-)footage for example - MediaInfo:
Format: DV
Commercial name: DVCPRO
Width: 720 pixels
Height: 576 pixels
Display aspect ratio: 16:9
About the computer:
Dell Precision WorkStation T5500
24 GB RAM
2 processors w/ 8 cores together: Intel Xeon CPU E5620 @ 2.40GHz
System: 250 GB (SSD)
Media: 2 TB (this is one normal internal hard drive, no raid)
NVIDIA Quadro 4000 (driver version 297.03)
connected to internet (is a must in this company)
connected to intranet, server (is a must in this company, too)
optimized for performance
windows firewall active
AVIRA Porfessional
What would PrPro force to work with HD footage?
Add an RAID? internal/external?
Upgrade to CS6?
Edncode footage to another codec before linking it into PrPro? (which codec? encode with AME?)
Buy a new processor? (i7? which one?)
Buy any Hardware pieces?
TIA for your guidiance and best regards.

Take a look at the Dell T7400 currently at rank # 568, 'Base2008PT1' on Benchmark Results. It is somewhat similar to your own system, but has more memory, a better video card and some raid0 arrays. Nevertheless, it is around 3.4 times slower than a fast system. My guess is that your system is even slower.
The material you try to edit is very demanding and requires a beefy computer. Even though there is nothing wrong with the dual Xeon E5620's, their clock speed works against you (I have the same CPU's in a file server, but that is far less demanding than editing), as does the amount of memory in the system. You can be helped with more disks, but don't expect miraculous performance improvements. But all little things help.
The alternative is a complete new system, but that can be pricey. Even if you build it yourself, see Planning & Building a NLE system it can be costly. It gives you very fast performance as demonstrated on the Reflections page and you should not get such a system from Dell or HP, unless you have unlimited funds.

Serious performance problems

Hi
I am having some very serious performance problems witgh java web start. I have a swing client that transmits XML/HTTP to and from a server, parses it, etc... I am finding that the XML/HTTP data request
is a factor of 10 to 100X slower, at least, using Java Web Start than without.
Any suggestions would be helpful
Thanks
Charles

Charles,
I've also observed some overhead when running an application deployed with JAWS compared to running the application from the jar, or in my dev environment.
After searching these forums a bit, I found this buried nugget of info: Try System.setSecurityManager(null) if you are requesting <all-permissions/> already.
Before the workaround, my application was taking 194 seconds for a single analysis run. After this workaround was applied, the same analysis run took only 82 seconds.
So as you can see, there is considerable overhead associated with performing operations through the layers of security (my guess). My particular application does a lot of disk I/O (which is probably something the security manager watches closely).
I stress the 'workaround' aspect of this because I haven't fully investigated the ramifications of using it, but eventually this might turn into a bug submission (because if I'm already requesting all-permissions, why do I still need to do setSecurityManager(null)?).
At any rate, hope this helps!
-jw

Disk performance problem

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