I don't know anything about the HDS storage, presumably your new box is FICON? So you should see a world of difference there. We run mod 3s, 9s, 27s, 54s. All without PAV. All on DS8300. We don't see any performance issues at all. The performance problem that PAV solves is queueing on the UCB. Now, I probably wouldn't stick all the 300 CMS users going after the same focus database on 1 mod 54, but for a linux server, I think they make sense. How many I/Os could 1 guest managed to get queued to that volume? I think i'll just be having them add all new stuff as 54 (65,520 cyl). (except paging volumes which we'll probalby keep as 3's). Marcy Cortes "This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation."
________________________________ From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Dave Yarris Sent: Thursday, July 03, 2008 6:39 AM To: IBMVM@LISTSERV.UARK.EDU Subject: [IBMVM] z/VM 5.3 and PAV We are currently running a single z/VM 5.3 (701) system on Hitachi 7700E disk, set up as 3390-3, connected to a z9BC via ESCON. This has worked well, but the limited disk storage has kept us from growing past the 15 RH Linux guests. We are in the process of installing a new Hitachi USP V that will give us the storage capability to use some M9 and M27 for some of the new servers that are planned. With those volume sizes I am anticipating that we will need to utilize PAV for some applications. We don't have any prior experience or knowledge other than what the manuals tell us. Everything I have found on the subject so far has been pretty generic. We were looking at Hyper-PAV or possibly dynamic. Will dynamic PAV work for z/VM 5.3? Can anyone share any experiences or their particular application? (Volumes? Minidisks? Particular applications i.e. DB2, etc?) Appreciate any and all input. Dave
