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>> There's "specs" and then there's real life. I have never
>> seen a hard drive
>> that could do this. I've got brand new IBM 7200rpm ATA66
>> drives and I can't
>> seem to get them to do much better than 6-7mb/sec with either Win98,
>> Win2000, or Linux. That's with Abit BH6, an Asus P3C2000,
>> and Supermicro
>> PIIIDME boards. And yes, I'm using an 80 conductor cable. I'm using
>> Wintune on the windows platforms and bonnie on Linux to do benchmarks.
>
> I don't believe the specs either, because they are for the "ideal" case.
Believe it. I was getting about 45MB/s writes and 14 MB/s reads using
RAID0 with the 2.3.99pre kernels on a Dual PII 450 with two 30G
DiamondMax (7200rpm Maxtor) ATA-66 drives connected to a Promise Ultra66
controller.
Then I moved back to kernel 2.2.15-pre18 with the RAID and IDE patches
and here are my results:
RAID0 on Promise Card 2.2.15-pre18 (1200MB test)
----------------------------------------------------------
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
6833 99.2 42532 44.4 18397 42.2 7227 98.3 47754 33.0 182.8 1.5
***** *****
When doing _actual_ work (I/O bound reads on huge data sets), I often
see sustained read performance as high as 50MB/s.
Tests on the individual drives show 28+ MB/s.
The performance is simply amazing -- even during real work (at least
mine -- YMMV). And best of all, the whole set-up (Promise card + 2X
Maxtor drives only cost me $550....)
I simply can't see how SCSI can compete with that.
Scott
--
Scott M. Ransom
Phone: (781) 320-9867 Address: 75 Sanderson Ave.
email: [EMAIL PROTECTED] Dedham, MA 02026
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