PAV should only be used when necessary - for MOSTLY READ devices only. For devices with write activity, I have examples where I/O response times get worse, not better. Assuming your objective is better service? keep it super simple, there are many more important places to focus when it comes to performance.
Tyler Koyl wrote:
Background: - Moving ~ 20 z/OS Oracle Databases to Oracle 10g on z/VM linux (Hello z10!) - Powers that be want to move everything to RHEL5. - San Disk is the Frankenstein 9990v that has Hitachi, Sun and StorageTek all over it. We have 2105 ECKD DASD running off it with 3390B and 3390A definitions. We see PAV bases and aliases under z/VM no prob. - No FCP at this point as FCP from the 9990v to the z9BC requires a San volume controller for IBM to support it. We don't have the SVC. Straight FICON ECKD is all we got and most are MOD9s (We wll be going bigger if we stick ECKD). I have done some reading. Some from old sources, some from new.I am a bit overloaded now. Am I correct that in order to get PAV working on the linux guest I only have to vary the volumes online to guest itself and the linux DASD driver will handle the PAV when required? I really don't have to mess around with multipath, mdadm or EVMS (we have some SLES)? In my testing with RHEL5 I can vary online the base and alias devices and all appears ok. The DASD driver finds which are the alias and the bases and the UIDs all point to the same device. Am I on the right path here? D. Tyler Koyl Management Analyst (Embedded image moved to file: pic08260.gif) Viterra Tel (306) 569-6122 Fax (306) 569-4382 mailto:[EMAIL PROTECTED] http://www.viterra.ca This e-mail and any attachment(s) are confidential and may be privileged. If you are not the intended recipient please notify me immediately by return e-mail, delete this e-mail and do not copy, use or disclose it. ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ------------------------------------------------------------------------
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