> Presently the application is split onto several disks. The data is to be > combined onto one disk. The data is a NOMAD database.
Ah. That would argue against SFS, then. Nomad does its own balancing act internally. > I thought PAV was not an option for VM. Does z/VM 5.2 support PAV? Well, sort of. CMS doesn't know much about it. It's mostly for guest use AFAICT. If you're going to replace the mod 3's one for one with mod 9s, then it shouldn't get any worse than it is. As someone mentioned, just don't put *other* stuff on the disks that may change the access patterns.
