On Fri, 15 Feb 2008, Roch Bourbonnais wrote:
>>> What was the interlace on the LUN ?
>
> The question was about LUN interlace not interface.
> 128K to 1M works better.
The "segment size" is set to 128K. The max the 2540 allows is 512K.
Unfortunately, the StorageTek 2540 and CAM documentation does not
really define what "segment size" means.
> Any compression ?
Compression is disabled.
> Does turn off checksum helps the number (that would point to a CPU limited
> throughput).
I have not tried that but this system is loafing during the benchmark.
It has four 3GHz Opteron cores.
Does this output from 'iostat -xnz 20' help to understand issues?
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
3.0 0.7 26.4 3.5 0.0 0.0 0.0 4.2 0 2 c1t1d0
0.0 154.2 0.0 19680.3 0.0 20.7 0.0 134.2 0 59
c4t600A0B80003A8A0B0000096147B451BEd0
0.0 211.5 0.0 26940.5 1.1 33.9 5.0 160.5 99 100
c4t600A0B800039C9B500000A9C47B4522Dd0
0.0 211.5 0.0 26940.6 1.1 33.9 5.0 160.4 99 100
c4t600A0B800039C9B500000AA047B4529Bd0
0.0 154.0 0.0 19654.7 0.0 20.7 0.0 134.2 0 59
c4t600A0B80003A8A0B0000096647B453CEd0
0.0 211.3 0.0 26915.0 1.1 33.9 5.0 160.5 99 100
c4t600A0B800039C9B500000AA447B4544Fd0
0.0 152.4 0.0 19447.0 0.0 20.5 0.0 134.5 0 59
c4t600A0B80003A8A0B0000096A47B4559Ed0
0.0 213.2 0.0 27183.8 0.9 34.1 4.2 159.9 90 100
c4t600A0B800039C9B500000AA847B45605d0
0.0 152.5 0.0 19453.4 0.0 20.5 0.0 134.5 0 59
c4t600A0B80003A8A0B0000096E47B456DAd0
0.0 213.2 0.0 27177.4 0.9 34.1 4.2 159.9 90 100
c4t600A0B800039C9B500000AAC47B45739d0
0.0 213.2 0.0 27195.3 0.9 34.1 4.2 159.9 90 100
c4t600A0B800039C9B500000AB047B457ADd0
0.0 154.4 0.0 19711.8 0.0 20.7 0.0 134.0 0 59
c4t600A0B80003A8A0B0000097347B457D4d0
0.0 211.3 0.0 26958.6 1.1 33.9 5.0 160.6 99 100
c4t600A0B800039C9B500000AB447B4595Fd0
Bob
======================================
Bob Friesenhahn
[EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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