Virtual Portion X Ontape

Hello I'm having some problems with Ontape and virtual memory segments. The parameters for the virtual portion of shared memory are tuned and configured correctly. Even when all users are online and using the applicatives, the value is enough and there is only one segment in memory. But when I perform an ontape -s (Archive level 0), then Online assigns one, sometimes two or three additional segments of virtual memory. And I don't know why is this happening. It is happening not on a single machine, but in many others plattaforms that I'm monitoring. Does anybody knows why this happens ??? Thanks in advance. -- Paulo Roberto Marelli de Amorim TS&0 Consulting Brasil Sent via Deja.com http://www.deja.com/ Before you buy.

Paulo Amorim wrote: > > Hello > > I'm having some problems with Ontape and virtual memory segments. > > The parameters for the virtual portion of shared memory are tuned and > configured correctly. Even when all users are online and using the > applicatives, the value is enough and there is only one segment in > memory. > > But when I perform an ontape -s (Archive level 0), then Online assigns > one, sometimes two or three additional segments of virtual memory. And > I don't know why is this happening. It is happening not on a single > machine, but in many others plattaforms that I'm monitoring. > > Does anybody knows why this happens ??? You do not state version or platform but I suspect 7.31. The onarchive thread was changed in 7.31 to go through the server and determine, before starting, what pages need to be archived and which do not. This involves creating a data structure to hold the bitmaps and other system configuration information in a way that the onarchive thread can use it and in a location that is static, ie the data will not change during the archive. For a larger server this allocation can certainly entail creating additional virtual segments. If you want to you can fold them into your SHMVIRTSIZE but if the additional shared memory is causing problems just add an 'onmode -F' immediately following the archive in your archive instructions or scripts. Art S. Kagel