Linux Raid Problem?

Chris Chabot chabotc at reviewboard.com
Thu Oct 4 11:15:00 CDT 2001


What would be a good benchmark program to test nt4 performance? I have 8
dell 2550's - nt4 servers, with 3x10k rpm disks in  a raid 5 volume. It
would be interesting to get some bench results from those boxes to see how
it holds vs the linux / raid solutions i have here (12 servers).

    -- Chris

----- Original Message -----
From: "Hubbard, David" <dhubbard at dino.hostasaurus.com>
To: "'David Durham'" <david.durham at wcom.com>
Cc: <Linux-PowerEdge at dell.com>
Sent: Thursday, October 04, 2001 5:16 PM
Subject: RE: Linux Raid Problem?


> That's what I do not know because running hardware
> raid on linux was the only option I would accept.
> I did test software raid on the 2400 the first
> time I built one and got phenomenal results, it
> was flying, but never loaded NT to see how the
> hardware handled.  If I had a spare server, I'd load
> one up and give it a try.
>
> Dave
>
> -----Original Message-----
> From: David Durham [mailto:david.durham at wcom.com]
> Sent: Thursday, October 04, 2001 11:05 AM
> To: Hubbard, David
> Cc: Linux-PowerEdge at dell.com
> Subject: RE: Linux Raid Problem?
>
>
> So are you sure that it's the hardware and not the linux drivers? I have
> not tried putting NT on there and seeing what the rate is? Have you?
>
> Thanks,
>    Davy
>
>
> On Wed, 2001-10-03 at 15:32, Hubbard, David wrote:
> > No need to describe the problem Davy, it's a known issue
> > that raid performance on the 2400 sucks! :-)
> >
> > I have a bunch of 2400's running with the RAID controller
> > enabled with 10k rpm disks and I get a whopping 4.4 MB/s
> > write rate on it.  I can read at 10 to 15 times that rate.
> > The problem is that the garbage 2/Si raid controller on
> > our mother boards does not do write-back cache because it
> > does not support a battery backup and could not guarantee
> > the data.  I've still never heard a good explanation on
> > why we don't at least see a slightly better write rate
> > out of drives that can do 20 MB/s writes on their own,
> > the processor on the 2/Si must be garbage too.
> >
> > Sorry to be the bearer of bad news, I'm currently looking
> > to replace my 2400's with newer models, although this
> > issue pissed me off enough to consider other vendors, I'll
> > probably stay with Dell because their support is good,
> > especially from the Dell employees on this list.
> >
> > Dave
> >
> > > -----Original Message-----
> > > From: David Durham [mailto:david.durham at wcom.com]
> > > Sent: Wednesday, October 03, 2001 4:11 PM
> > > To: Linux-PowerEdge at dell.com
> > > Subject: Linux Raid Problem?
> > >
> > >
> > >   Before I describe this problem in more detail, can you tell
> > > me if you
> > > have ever heard of a problem with Linux and the PowerEdge 2400 series
> > > where the disk write speed is rediculusly slow around 3Meg/s
> > >   This is linux Mandrake 8.0 out of the box and I've
> > > configured via the
> > > BIOS, the 3 17 gig SCSI drives as a single 30 gig Raid 5 container.
> > >
> > > Thanks,
> > >    Davy
> > >
> > > _______________________________________________
> > > Linux-PowerEdge mailing list
> > > Linux-PowerEdge at dell.com
> > > http://lists.us.dell.com/mailman/listinfo/linux-poweredge
> > >
>
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