Hi Alex, You should combine the DASD response time with I/O rate when you check your DASD's performance. And see how is the I/O intensity during your batch window.. On Wed, Aug 10, 2011 at 5:39 AM, Hal Merritt <hmerr...@jackhenry.com> wrote:
> In modern DASD, 3390-3, 3390-9, 3390-whatever are just logical constructs. > > More, hopefully most all of the I/O looks like it is directed to a volume, > but actually is satisfied in cache or buffers and never really touches the > physical disk. > > > > > > > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On > Behalf Of Alex Wang > Sent: Tuesday, August 09, 2011 5:02 AM > To: IBM-MAIN@bama.ua.edu > Subject: IOPS benchmark > > Hi All, > > We are now evluating the IOPS for some DASD (3390-3 and 3390-9). Because > the DASD are shared by all LPARs in the sysplex. As per RMF IO activity, > there are a few DASDs which were accessed 2000 per second at a specific > time. We are afraid there may be hotpot problem occur in the near future. > > Is there any reference which clearly states the benchmark or thredhold for > the IBM DASD (3390-3 and 3390-9)? The DASD IOPS may be 300 at a specific > time in the sysplex. Is it acceptable or do we need to tune that DASD? > > Looking forward to hearing from you. Thanks! > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send email > to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the > archives at http://bama.ua.edu/archives/ibm-main.html > NOTICE: This electronic mail message and any files transmitted with it are > intended > exclusively for the individual or entity to which it is addressed. The > message, > together with any attachment, may contain confidential and/or privileged > information. > Any unauthorized review, use, printing, saving, copying, disclosure or > distribution > is strictly prohibited. If you have received this message in error, please > immediately advise the sender by reply email and delete all copies. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html > -- Cobe Xu Best Regards ----------------------------------------------------------- z/OS Performance & Capacity Analyst z/OS System Programmer Email: cob...@gmail.com ----------------------------------------------------------- ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
