Date: Fri, 23 Feb 1996 21:04:49 +0100 From: se@zpr.uni-koeln.de (Stefan Esser) To: Rashid Karimov <rashid@rk.ios.com> Cc: hackers@freebsd.org Subject: Re: Disk perf. with different HDs/Adapt. Message-ID: <199602232004.AA07830@Sysiphos> In-Reply-To: Rashid Karimov <rashid@rk.ios.com> "Disk perf. with different HDs/Adapt." (Feb 23, 14:26)
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On Feb 23, 14:26, Rashid Karimov wrote:
} Subject: Disk perf. with different HDs/Adapt.
} Hi there folx,
}
}
} Who are Today's Fastest ? :)
}
}
} I mean the combination of motherboard/SCSI HD/SCI adapter
} that delivers max perfomance ? max read/write speed etc ?
}
}
} I have different values here on ASUS 133/166 Mhz P5,
} 150/200Mhz PPro machines( with mucho deprecated PCI set)
} and RAID Arrays.
}
}
} For example
} (command is: dd if=/dev/rsd0a of=/dev/null count=200 bs=64k)
}
} P166/ASUS/Aha2940(not wide,Seagate):
} 13107200 bytes transferred in 2 secs (6553600 bytes/sec)
If you report 'dd' numbers, then **please** add at least 'time' info ...
E.g.:
# time dd if=/dev/rsd0a of=/dev/null count=200 bs=64k
13107200 bytes transferred in 2 secs (6553600 bytes/sec)
1.92 real 0.01 user 0.05 sys
# time dd if=/dev/rsd0c of=/dev/null count=800 bs=64k
52428800 bytes transferred in 8 secs (6553600 bytes/sec)
7.53 real 0.00 user 0.24 sys
Those 1.92 seconds make for exactly 6826667 Bytes per second ...
And the 7.43 give some 6962656 Bytes/s.
(Yes, I know, the results aren't exact to more than 2 decimals
due to the limited time resolution ...)
BTW: Mine is an ASUS SP3G motherboard (NCR53c810, Quantum Atlas 2GB),
hardly a competition to your P5 or P6 :)
} P133(other stuff the same)
} 52428800 bytes transferred in 8 secs (6553600 bytes/sec)
}
} P6-200Mhz(the same, runs INND and ~130 readers + 2 feeds
} at the time of the test):
} 13107200 bytes transferred in 3 secs (4369066 bytes/sec)
} real slow comparing to the "regular" PCI chip like one
} in P5 ASUSes
}
} P5-166(Bustec Wide SCSI, Seagate 32250W, under BSDI) -
} ~8700000 bytes/sec
That's one of the famous dual-head SCSI drives ?
Will be beaten by the next generation of Fast-20 drives
from all major vendors (Seagate, Quantum, IBM) which use
MR head technology (net data rate of 12MB/s to 7MB/s).
} P6-200 ASUS( hate it!) with RAID array ( all in HW no
} special drivers reqd) - only 3Mb/sec !
Well, RAID doesn't seem the way to go, if you are looking
for top performance ... Were the drives synchronized and
was a reasonable write buffer in the controller ?
How does CCD compare ?
It was quite good according to the last values I saw ...
Regards, STefan
--
Stefan Esser, Zentrum fuer Paralleles Rechnen Tel: +49 221 4706021
Universitaet zu Koeln, Weyertal 80, 50931 Koeln FAX: +49 221 4705160
==============================================================================
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