PE4600 and Red Hat Questions

Hubbard, David dhubbard at dino.hostasaurus.com
Fri Jun 21 17:08:00 CDT 2002


All you need are right here:

http://www.acnc.com/04_02.html

Bonnie++ and IOZone will punish your disks. :-)

David

> -----Original Message-----
> From: Abe Hayhurst [mailto:abe at wedographics.com]
> Sent: Friday, June 21, 2002 4:10 PM
> To: Seth Mos; Arjan van de Ven
> Cc: linux-poweredge at dell.com
> Subject: RE: PE4600 and Red Hat Questions
> 
> 
> What tools should I use to test the performance of the RAID 
> when I change
> the parameters? Do they come on the RH7.3 CDs? If not, where 
> can I get them?
> 
> -----Original Message-----
> From: Seth Mos [mailto:knuffie at xs4all.nl]
> Sent: Friday, June 21, 2002 4:21 PM
> To: Arjan van de Ven; Abe Hayhurst
> Cc: linux-poweredge at dell.com
> Subject: Re: PE4600 and Red Hat Questions
> 
> 
> At 16:35 21-6-2002 -0400, Arjan van de Ven wrote:
> 
> >for raid0/1 I'd recommend 64K to 128Kb... smaller is worse generally.
> >Playing with the caching settings (and readahead) is worth 
> it, the optimal
> >settings for these very much depends on the workload
> 
> 128KB works well in combo with both the 10KRPM and 15KRPM disks.
> I tested this on a PERC3/DC in a 2550 with raid10. Larger 
> gives you better
> sequential throughput.
> 
> > > My setup will be a PERC3/DC with 4 10,000 RPM drives on each SCSI
> channel
> > > for a total of 8 10,000 RPM drives. I was planning on 
> doing RAID 10
> becuase
> > > from what I had read on Dell's website this would give me the best
> > > performance. My goal is maximum MB/sec. The RAID will be 
> used for file
> > > sharing large (50 - 500 MB) files. So the goal would be maximizing
> MB/sec
> > > for sequential reads and writes. Since an individual 
> drive can push 25 -
> 30
> > > MB/sec I was hoping to achieve 100 - 120 MB/sec.
> >
> >120Mb/sec will be a nice chalange versus the PCI bandwidth.
> >Note that pure RAID0 will be faster than RAID10 for single 
> threaded use.
> 
> It's a 64Bit/66Mhz bus/card so it's more like 533MB/s :)
> Raid 10 is fastest in reading and writing at the expense of some extra
> disks. It's also low overhead on the raid controller. The 
> PERC3/DC isn't
> the most powerfull raid controller.
> If you can spare the money the PERC3/QC should be a faster 
> choice even when
> you are not using the other channels. Although I am not sure 
> this affects
> the raid 10 performance.
> 
> Cheers
> 
> --
> Seth
> It might just be your lucky day, if you only knew.
> 
> 
> 
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