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

  • From: "lale obradovic" <cika.lale@xxxxxxxxxxxxxx>
  • To: "Michael Erwin" <michael.erwin@xxxxxxxxxx>
  • Date: Thu, 28 Sep 2006 19:07:04 +0200

Hi Michael,

Thanks a lot for a great post!


On 9/28/06, Michael Erwin <michael.erwin@xxxxxxxxxx> wrote:

Hi Lale,

One would expect to find it here:

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) /

Bits Per Sector as defined by HP can be here: <>

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. Hotsos Symposium 2007 / March 4-8 Visit for curriculum and schedule details...


From: oracle-l-bounce@xxxxxxxxxxxxx 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)?



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