My impression is that its more efficient, and that you would build that efficiency into your 'golden image' so that it can be leveraged with the building of each new image. I agree that in normal conditions theres negligible difference, but when the host system is being stressed and you really NEED swapping, I think the shorter I/O paths could only work in your favor. Still, I'll have to see if I'm comfortable with the number of modifications needed to implement diag, since fba mode works right out of the box.
Ray Mrohs -----Original Message----- From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On Behalf Of Marcy Cortes Sent: Wednesday, July 29, 2009 7:33 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: Dasd_diag_mod question Question, what is the value of using diag for swapping to vdisk? Even if it is a more efficient driver, you're swapping to memory. How much does it save? And how much swapping would you need to be doing for any savings to be worthwhile? Wouldn't it be simpler to just increase the VM size to an amount that minimizes swapping? Or are there servers you *want* swapping a lot for some reason and if so why? Inquiring minds... Marcy ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
