James, That's mostly correct. The qualifier is that the storage is only allocated when the guest actual puts something into swap. If it's not referenced thereafter, those pages used for the Vdisk get swapped out by z/VM. Pretty low-cost stuff, in most people's opinion.
Take a look at the xpram driver. It makes virtual storage look like a disk to Linux/390, which then needs to have "mkswap" and "swapon" run against it. Mark Post -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of James Melin Sent: Tuesday, June 22, 2004 9:40 AM To: [EMAIL PROTECTED] Subject: Expanded storage in VM - can it be used for linux swap? My understanding of Vdisk is that it is created using 'real' memory that would otherwise be available for VM workload. Our systems person does not want to let me use 'real' memory for a vdisk swap area, and asked me if it was possible to use expanded storage instead. I don't know, since I'm not the VM/z-OS guy. Opinion of the collected wisdom? ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
