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choosing disk system for Mechanica

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choosing disk system for Mechanica

Hello,

I've build a new computer for using Mechanica (Opteron dual-core, Nforce4,
2GB 250MHz ram, quadroFX).

I'm looking for any advice choosing the hard disks.
I'm wondering what would be better for Mechanica working files :
- WD raptor 150 (sata)
- seagate 7200.9 300 (sata2)
- 2X (striping raid) seagate 7200.9 300 (sata2)

Have anyone any advice or some comparison elements ?

Thanks,
GB

2 REPLIES 2

RE: choosing disk system for Mechanica

Dear GB,

Save money on the disk system and spend more on the memory, then you won't need a fast disk system, since most analyses will run without swapping.

Example from my machine (Opteron 175 dual core, 4 Gb RAM, 2 x 200 Gb Seagate ST3200827AS, WindowsXP64)

46,000 elements
750,000 equations (solving equations = 12 min 47sec)

3200 s elapsed time
3700 s CPU time

Max Memory Usage 2.5 Gb
Working Directory 4.5 Gb

Wildfire 3.0 F000
Mechanica K-03-39:spg

Regards,

Rod Giles
Pro/Mechanica Users Group UK

Re: choosing disk system for Mechanica

Thanks for your response,

however, I'm not speaking about swapping but in your example you says
working directory 4.5 Gb so your disk performance is also important.

I thought about installing 4GB instead of 2Gb few weeks ago but some
comparison between 1Gb and 3Gb installed on my old computer show me a very
poor difference.
Have you compared the example you mentioned with just 2Gb installed ?
I would be very interested in this result.

I noticed that Mechanica spend a lot of time writing or reading on the disk,
even with a lot of memory (I'm speaking about it's temp and working
directory, not Windows swap) Then The computer spend a lot of time CPU
working at 10% to 30%, waiting for the disk system.

So, I thought about installing a speeder disk system instead of increasing
memory size.
So, I'm wondering about the performance differences between Raptor (very
speed disk) and a raid system of 2 common disks.


Thanks & regards,
GB