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

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

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