Re: IO rate for U320 SCSI 15K RPM Hard Drive

Hi Michael,

Thanks a lot for a great post!

Lale

On 9/28/06, Michael Erwin <michael.erwin_at_hotsos.com> wrote:
>
> Hi Lale,
>
> One would expect to find it here:
>
>
> http://h10010.www1.hp.com/wwpc/me/en/sm/WF06c/A1-1769079-1769113-1769113-1769139-1769139-16169139.html
>
>
> Nothing really available on their site...
>
> However, estimate IOPS is relatively easy with
>
>
> Spindle IOPS = ((RPM/60)/3)*2
>
> Or at least ~167 8k IOPS per spindle
>
> To figure out User Data Transfer rates, use the following:
>
> UDT=(Spindle Speed / 60 * Sectors Per Track * Bits per Sector * 8) /
> 1,000,000
>
> Bits Per Sector as defined by HP can be here:
>
> http://h18000.www1.hp.com/products/quickspecs/11531_div/11531_div.HTML <
> http://h18000.www1.hp.com/products/quickspecs/11531_div/11531_div.HTML>
>
> So BPS=512
>
> The other two number we need is the platters used in this 146GB drive and
> the physical platter size (3.5", 2.5", 1", and I would assume 3.5") to
> determine an areal density or at least GB/Platter density to determine the
> inner & outer range of UDT. It will be a wide range considering Zone Bit
> Recording (ZBR)
>
> BTW, the whole U320 MB/Sec transfer is a U320 SCSI transfer rate and not
> the user data transfer rate for the drive itself.
>
>
> Michael Erwin
> Hotsos Enterprises, Ltd.
> http://www.hotsos.com
> Hotsos Symposium 2007 / March 4-8
> Visit www.hotsos.com for curriculum and schedule details...
>
> ________________________________
>
> From: oracle-l-bounce_at_freelists.org on behalf of lale obradovic
> Sent: Thu 9/28/2006 12:19 PM
> To: oracle-l
> Subject: IO rate for U320 SCSI 15K RPM Hard Drive
>
>
> Hi All,
>
> Does anyone have some information of expected IO rate (IOPS and/or MBPS)
> for U320 SCSI 15K RPM Hard Drive (HP 146GB U320 15K Universal HDD)?
>
> Thanks!
>
> Lale
>
>
>

--
http://www.freelists.org/webpage/oracle-l