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

  • From: "Michael Erwin" <michael.erwin@xxxxxxxxxx>
  • To: <cika.lale@xxxxxxxxxxxxxx>, "oracle-l" <oracle-l@xxxxxxxxxxxxx>
  • Date: Thu, 28 Sep 2006 11:57:02 -0500

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) / 1,000,000
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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