Re: IPL times

[Kris Buelens]

During the tests for migration to from 2x9672 to z9, I noted big differences too, but I didn't time it.  Our partiotns have access to old DASD and new DASD, both have about 2000 addresses.  Much less than you.
- when I have the old DASD all as NOT SENSED, the IPL is very fast
- with the old DASD sensed, the system indeed seems to hange quite a while, much more than twice as long
The difference: the old DASD have one escon channel to each control unit, the new DASD have 4 ficon channels per control unit.  I thought that the lack of multiple paths was causing delays (when switching to production the old DASDs will get 5 escon channels)

Kris,
IBM Belgium, VM customer support