Just to let you know how I wasted my time the last 3 hours on the famous shmget failed error: Solaris has also a minimum shared mem segment size which I had set to 200 bytes according to recommendations I found in the mail archive. Well, until I noticed (after 3 hrs) that the postmasters initial call in my case was 144 bytes. Bummer, I was all the time on the wrong track by assuming the the error 'invalid argument' was because not matching the maximum size. Maybe someone finds this message in the mail archive later. Or somebody please put this in the Solaris FAQ. Dirk
