Thanks, Andrew:
What ATA RAID controllers are you using? Do you have any benchmark data
about sequential write?
Donghui
----- Original Message -----
From: "Rechenberg, Andrew" <ARechenberg@shermanfinancialgroup.com>
To: "Donghui Wen" <dhwen@protegonetworks.com>; <linux-raid@vger.kernel.org>
Sent: Saturday, March 22, 2003 1:07 PM
Subject: RE: 3ware bad write speed.
> > I have several questions:
> >
> > (1) Does this problem only exists in 3ware ide raid adaptor?
> > We test SCSI
> > too, it is much faster.
> > If it is 3ware's driver problem, scsi raid should have the same
> > problem.
> > (2) Has 3ware fixed this problem yet? They claim they support linux.
>
>
> Not sure about these as I have no experience with the 3ware cards
>
>
> > (3) One solution is to setup 3ware in jbod mode and use linux
> > software-raid.
> > what percentage of CPU used if using software-raid? It
> > might cost too
> > much CPU power
> > without using hardware raid.
>
> I just setup a 26 disk software RAID10 array on Linux and it has put a
> minimal load on the CPU's (my box is a Dell PowerEdge 6600 with quad
> Xeon 1.4GHz with HT enabled). I will be moving this box to a 52 disk
> software RAID10 setup as soon as I finish testing some kernel patches.
>
> I can recommend software RAID on Linux without hesitation. The kernel
> developers have done a great job with MD.
>
> > (4) Other than 3ware, is there any better raid card
> > supported by linux?
> >
>
> We moved from hardware to software RAID because we couldn't find a
> hardware card that gave us the performance that we wanted. I have the
> 52 disk RAID10 array described above setup on some test hardware at work
> and tiobench, with 4 threads and 32KB blocks shows 515MB/s sequential
> reads (ext3 default journaling mode). And as I said earlier, the load
> on the CPU's is minimal in my setup (OLTP and batch database
> processing).
>
>
> > I appreciate your guys help
> >
> >
> > Donghui Wen
> >
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