> -----Original Message-----
> From: Jeff Hill [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, June 13, 2000 1:26 PM
> To: Gregory Leblanc
> Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]
> Subject: Re: Benchmarks, raid1 (was raid0) performance
>
> Gregory Leblanc wrote:
>
> >>--snip--<<
> > > I conclude that on my system there is an ide saturation point (or
> > > bottleneck) around 40MB/s
> > Didn't the LAND5 people think that there was a bottleneck
> around 40MB/Sec at
> > some point? Anybody know if they were talking about IDE
> drives? Seems
> > quite possible that there aren't any single drives that are
> hitting this
> > speed, so it's only showing up with RAID.
> > Greg
>
>
> Is there any place where benchmark results are listed?
Not that I know of. Is there any interest in having these online in some
biggass database? Assuming that I can manage it, I'll have a server online,
running some SQL server, by next weekend. I could put things into there,
and provide some basic SQL type passthru from the web.
> I've finally
> gotten my RAID-1 running and am trying to see if the
> performance is what
> I should expect or if there is some other issue:
>
> Running "hdparm -t /dev/md0" a few times:
>
> Timing buffered disk reads: 64 MB in 3.03 seconds = 21.12 MB/sec
> Timing buffered disk reads: 64 MB in 2.65 seconds = 24.15 MB/sec
> Timing buffered disk reads: 64 MB in 3.21 seconds = 19.94 MB/sec
My understanding has always been that hdparm was on crack as far as speed
went. I've never really taken the time to check, since tiobench does a
beautiful job for what I need, and because tiobench is CONSISTENT.
> And bonnie:
> -------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
> 800 5402 90.9 13735 13.7 7223 15.0 5502 85.0 14062 8.9 316.7
2.8
>
>
> I had expected better performance with the system: Adaptec
> 2940U2W with
> 2x Seagate Cheetah (LVD) 9.1G drives; single PII 400Mhz;
> 512MB ECC RAM;
> ASUS P3B-F 100Mhz.
I don't have anything that caliber to compare against, so I can't really
say. Should I assume that you don't have Mika's RAID1 read balancing patch?
> I have to say the RAID-1 works very well in my crash tests, and that's
> the most important thing.
Yep! Although speed is the biggest reason that I can see for using Software
RAID over hardware. Next comes price.
Greg
