On Thursday, 03/25/2010 at 12:11 EDT, "Schuh, Richard" <rsc...@visa.com> wrote:
> With it not being a full-pack as Mike mentioned in his post, there would always > have to be CCW translation, would there not? The question is whether that is a > significant hit compared to the full pack including Cyl 0. Considering that, in > the olden days, CP overhead was quite high compared to today, the performance > hit, while there, might not be sufficient to be a cause of concern. Mike said "minidisk rather than a dedicated full disk." Since the context of prior posts was full-pack minidisks (FPMD), I applied the same qualifier to Mike's use of "minidisk". I'm not going to try to compare the CCW translation costs of a non-FPMD to a dedicated device other than to say that it's slower as there's more to do. CCW translation is the same for FPMD as for a dedicated device. Alan Altmark z/VM Development IBM Endicott
