On Friday 16 December 2005 15:58, Joshua Baker-LePain wrote:
>On Fri, 16 Dec 2005 at 3:39pm, Gene Heskett wrote
>
>> On Friday 16 December 2005 13:30, Joshua Baker-LePain wrote:
>>> I've got a 4 disk SATA RAID0 on a 3ware controller for the holding
>>> disk.
>>
>> And what speeds are reported by "hdparm -tT /dev/md0"?
>
>How about bonnie++ numbers (thus including FS performance, and ext3
> ain't all that stellar a performer):
>
>[jlb@youknowwho jlb]$ bonnie++ -f -s 4096
>Version  1.03       ------Sequential Output------ --Sequential Input-
> --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
> --Seeks-- Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec
> %CP K/sec %CP  /sec %CP youknowwho.egr.d 4G           157490  74
> 76721  26           193369  29 361.7 1 ------Sequential Create------
> --------Random Create-------- -Create-- --Read--- -Delete--
> -Create-- --Read--- -Delete-- files  /sec %CP  /sec %CP  /sec %CP 
> /sec %CP  /sec %CP  /sec %CP 16  1359  72 +++++ +++ +++++ +++  2050 
> 99 +++++ +++  6848 98
>
>>> Yep.  In my case, the library is the only thing on the SCSI chain.
>>
>> Which means the data has to piped thru the pci bus, so the maximum
>> on a non-pci-x buss is 133MB/sec.  And the average will be somethat
>> less
>
>Not true.  Standard PCI goes up to 64bit/66MHz, which translates to

I've yet to find a pci buss that will run at 66mhz.  And I was under 
the impression it was only 32 bits wide, 4 bytes per buss cycle at 
33mhz=132 megabytes/second.  Minus handshaking etc.

pci-x is of course a different horse that can approach gigabyte 
performance.

>>500MB/s.  The 3ware card is 64/66.  The SCSI card is PCI-X at
>
>64bit/133MHz, which is >1000MB/s.

Ah, you didn't say pci-x before.

>> than that when the handshaking is factored in.  But only 2.5MB/Sec
>> says there is a very small pinhole someplace its being forced
>> through.
>
>Oh yes, indeed.

Still true.  That bonnie report word wrapped unforch.

-- 
Cheers, Gene
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