You should probably look at the number of i/o's you are doing today across the 3 and add them up and see if that number is reasonable on your modern DASD. It's likely you'll see no problem at all, especially if most r/o where MDC will kick in for you. If you've got only 1 virtual machine doing the writes, there are probably no issues at all (I kinda doubt NOMAD starts concurrent i/o to all its minidisks).
We've moved mostly to mod 9 for everything- (using 3's (and 1's) for paging mainly) without any issues. z/VM 5.2(+?) and PAV is a statement of direction. 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." -----Original Message----- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Dusha, Cecelia Ms. WHS/ITMD Sent: Tuesday, April 25, 2006 10:17 To: [email protected] Subject: Re: [IBMVM] 3390 Mod 3 verses 3390 Mod 9s Presently the application is split onto several disks. The data is to be combined onto one disk. The data is a NOMAD database. The DASD is on DS6800. I thought PAV was not an option for VM. Does z/VM 5.2 support PAV? I had not considered SFS as a possibility... SFS would add more overhead. Thank you. Cecelia Dusha
