Date: Mon, 22 Jan 1996 01:22:39 -0500 (EST) From: Kenneth Merry <ken@ulc199.residence.gatech.edu> To: gibbs@freefall.freebsd.org (Justin T. Gibbs) Cc: mrcpu@cdsnet.net, hackers@FreeBSD.org Subject: Re: some RAID numbers. Message-ID: <199601220622.BAA25087@ulc199.residence.gatech.edu> In-Reply-To: <199601212308.PAA12349@freefall.freebsd.org> from "Justin T. Gibbs" at Jan 21, 96 03:08:43 pm
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Justin wrote:
> (Jaye ? ) wrote:
> >I'd like to see the output from bonnie, just so I have some comparisons.
> >I have a barracuda with a 2940, and I don't see much better numbers.
> I don't have an Atlas, but there are many people on this list that
> do. Hopefully one of them will give more exact numbers. I don't
> recall the Bonnie results, but iozone for a 2940W to a wide Atlas
> was ~7.2MB/s with a command overhead of ~430us (using Bruce's
> disklatency program).
Here are some numbers from my system:
i486/100, Adaptec 2842, 32 mb ram, 256K cache, Quantum Atlas XP34300
FreeBSD 2.1R, Tagged Command Queueing enabled
Done on /var, which is only 2% full. (200 meg partition)
machine was pretty much idle
iozone with 8K blocks, 150 meg file:
----
IOZONE writes a 150 Megabyte sequential file consisting of
19200 records which are each 8192 bytes in length.
It then reads the file. It prints the bytes-per-second
rate at which the computer can read and write files.
Writing the 150 Megabyte file, 'iozone.tmp'...24.875000 seconds
Reading the file...31.031250 seconds
IOZONE performance measurements:
6323071 bytes/second for writing the file
5068645 bytes/second for reading the file
----
I'm not entirely sure why the writes are significantly faster than
the reads.
Here are the bonnie results:
----
{area238:/var/tmp:4:0} bonnie
File './Bonnie.2611', size: 104857600
Writing with putc()...done
Rewriting...done
Writing intelligently...done
Reading with getc()...done
Reading intelligently...done
Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done...
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
100 1921 97.2 6121 92.9 2283 53.2 1966 94.6 4848 82.4 94.2 13.6
----
> --
> Justin T. Gibbs
> ===========================================
> FreeBSD: Turning PCs into workstations
> ===========================================
Ken
--
Kenneth Merry
ken@ulc199.residence.gatech.edu
Disclaimer: I don't speak for GTRI, GT, or Elvis.
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