It has been said that the VM paging algorithms are tuned for 3 levels of storage, and you will get better performance by giving VM some XSTORE to play with. I would start with 5 gig of central and 1 gig of expanded storage, and play with the ratio from there.
Here is a nice writeup on this: http://www.vm.ibm.com/perf/tips/storconf.html Linux can also use expanded storage for a very fast swap device. The xpram driver will provide access to the xstore as if it were any other block device. Just modprobe xpram ; mkswap /dev/slram0 ; swapon /dev/slram0 and away you go. Jay Brenneman Ann Smith <annsmith@thehart To: [EMAIL PROTECTED] ford.com> cc: Sent by: Linux on Subject: Expanded Storage Question 390 Port <[EMAIL PROTECTED] IST.EDU> 11/12/2002 03:49 PM Please respond to Linux on 390 Port We are getting a z800 with 8 gig of storage. We will have a regular engine running VM apps that will use 1 gig central, 1 gig expanded. How do we divide up the remaining 6 gig for the LPAR that has the IFL engine dedicated to it? This LPAR is strictly for zVM running LINUX guests. I tried to search the marist archives but am getting firewall proxy access denied today. We'll be running zVM 4.3 in the IFL.
