On Thursday, 06/03/2010 at 09:22 EDT, Mark Pace <mpac...@gmail.com> wrote: > I didn't realize until just recently that with an OSA Express you can share the > same 3 addresses amongst all LPARs. > > Does the same apply to FBA devices on DS8xxx? Can I share the addresses
> between LPARs or does each LPAR need to use unique address? Currently I have > 32 devices defined on an FCP CHPID and I make sure that different addresses are > using in each LPAR. All modern devices work the same way. The Multiple Image Facility (MIF) ensures that the machine-readable subchannel number associated with the human-readable *device* number is unique in the CEC. I have seen people get caught in the 'maximum subchannels per chpid' trap because they had shared chpids, a lot of LPARs, and were skipping device numbers in the different LPARs, wasting subchannels. E.g. If you define 32 devices on an OSA chpid shared across 8 LPARs, you will use 8 x 32 = 256 subchannels on that OSA. Alan Altmark z/VM Development IBM Endicott
