You really do not want three minidisks belonging to the same SFS on the same DASD. SFS processing will process them singularly. i.e. it will do writes to them filling the first, then the second, then the third. SFS will not spread the I/O among multiple minidisks on the same DASD volume unless SFS processing has changed in 5.2.0.
-----Original Message----- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of O'Brien, Dennis L Sent: Wednesday, June 20, 2007 9:32 PM To: IBMVM@LISTSERV.UARK.EDU Subject: PAV and SFS Our DASD people have asked if they can replace our 3390-3 size DASD volumes with 3390-9's. My tentative answer is that most of the volumes that contain minidisks can be moved, if the new DASD has PAV. CP areas such as paging should remain on 3390-3. Our SFS servers have 3338-cylinder minidisks, one per volume. My initial thought is that I could put 3 of them on a 3390-9 with two PAV aliases, and the SFS server could do one I/O to each minidisk at the same time, just like it can when the minidisks are on separate volumes. In the recent "dasd 3390 -27" thread, Kris Buelens said, "For SFS though (and probably DB2) PAV is maybe of limited help: a given SFS server will start only one I/O to all its minidisks on the same disk." Is that really true? Does an SFS server look at the real devices or volsers that its minidisks are on, and only start an I/O to one minidisk on a volume at a time? Dennis O'Brien The three R's of Windows problem resolution: Retry, Reboot, Reinstall. -------------------------------------------------------- This message w/attachments (message) may be privileged, confidential or proprietary, and if you are not an intended recipient, please notify the sender, do not use or share it and delete it. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Merrill Lynch. Subject to applicable law, Merrill Lynch may monitor, review and retain e-communications (EC) traveling through its networks/systems. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaranteed to be secure or error-free. This message is subject to terms available at the following link: http://www.ml.com/e-communications_terms/. By messaging with Merrill Lynch you consent to the foregoing. --------------------------------------------------------
