Re: RAID 5 throughputs

Yeah, infact it is in a PCI-X slot @66Mhz.

On 8/19/06, Justin Piszcz <[email protected]> wrote:
>
>
> On Sat, 19 Aug 2006, [email protected] wrote:
>
> > Hi All,
> >
> > I have a storage system with 12 Maxtor 7200 rpm 250GB hard drives in
> > RAID 5 configuration with one hot spare. Maxtor claims that each drive
> > is capable of providing 56 MB/s sustained throughput. My host system
> > is connected to it using 64bit ultra320 Adaptec SCSI card. The host
> > system has 3.0 GHz pentium 4 (with HT) processor and 4 GB of RAM
> > running linux kernel 2.6.9. I was wondering what order of "maximum"
> > sequential read/write, random read/write throughput should i expect
> > using them. I am using some of the benchmarking tools like Bonnie,
> > Bonnie++, tiobench, dd, iometer etc. However the results from them
> > have been very depressing. Theoretically i should be able to achieve a
> > read sequential throughput close to min(10*56 = 560, 320) = 320 MB/s.
> > However my results are no way close to it. I was wondering if anybody
> > can give me some insight of what order of practical throughputs i
> > should expect using linux and what other factors may be creating
> > bottlenecks.
> >
> > TIA
> > -
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>
> Is your 64bit ultra320 card in a 64bit PCI + 66MHZ slot?
>
> If not, you will be limited to 133mb/s.
>
>