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:[email protected]] On Behalf Of Alex Wang Sent: Tuesday, August 09, 2011 5:02 AM To: [email protected] 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 [email protected] 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 [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
