I found that we can in fact share a LUN across LPARs. Had to use NPIV -or- use different physical FCP adapters because multiple login from the same FCP WWPN may be impossible or at least impractical. So with NPIV, the same physical FCP adapter will have a different WWPN for each LPAR, even for the same subchannel.
Our storage guys had to zone and mask the LUN(s) to multiple "hosts". (Same CEC but different virtual WWPNs ala NPIV.) Works fine. Make them EDEV and you can share minidisks ... with caution. (EDEV does not do reserve release.) (IBM should fix that!) IMPORTANT TERMINOLOGY NOTE: Once upon a time, IBM sold "FBA" devices which were channel attached. This is in contrast to CKD or ECKD, but still "disk". (This was in the days before FCP existed.) See device types 9336, 3370, and friends. There are still some storage vendors (I know of >one<) which can present FBA on an IBM channel. You meant "FCP" and we all understood. And it is "FBA". But there is other FBA, FYI. -- R; <>< On Thu, Jun 3, 2010 at 09:21, 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. > > -- > Mark Pace > Mainline Information Systems > 1700 Summit Lake Drive > Tallahassee, FL. 32317 >
