Hello Listers, We are in the process of adding some new linux guests. Now in the past we had some issues with sharing DASD in our VSE environment, the DASD must be set to shared to be able to run VSE on shared DASD. A few linuxguests also run on shared DASD that actually has been set SHARED. I wonder if that is really required. I had some discussion on this topic a while ago and it was said that Linux guests do not require DASD to be set to shared. VSE does require this because of the reserve/release it does on it's DASD. So from that view DASD need not to be set to shared when in use for Linux guests. A reason for having DASD not set to shared is to make use of MDC (our selling point is that we do not want guests to cache filesystem data because we have MDC). But when guests are running in multiple VM systems would this hurt in any way? I do know that whenever a guest has to be moved to a different VM the MDC need to be flushed. But what would it do to the multiple guests running in the various VM's? In theory we could end up running guests in 4 LPAR's while all of them share minidisks on one single DASD volume. I do not like to find out the hard way that we shouldn't have done that. What are your experiences with sharing DASD? Do you set DASD to SHARED? What are your reasons for either set SHARED or not set SHARED?
Met vriendelijke groet/With kind regards,
Berry van Sleeuwen
Flight Forum 3000 5657 EW Eindhoven
( +31 (0)6 22564276
Atos Origin <http://www.atosorigin.com/>
MO OC Mainframe Services
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