Yah, I've yet to see any data justifying wasting disk (except to get a
lunch from your disk vendor) for swap space instead of just moving the
extra disks to be part of the paging subsystem. If anybody has any data
that they think justifies this position, please send it.
VDISK gets paged out to disk in the paging subsystem when idle. So same
result as you suggest, but a much less expensive solution.
On 11/29/2016 3:10 PM, Mark Post wrote:
On 11/21/2016 at 09:35 AM, "Beesley, Paul" <paul.bees...@atos.net> wrote:
Hi
A couple of our z/Linux servers running under z/VM are apparently short on
swap space and I*ve been asked to increase it.
The PROFILE EXEC has 2 SWAPGEN statements to define 2 x 768MB swap VDisks.
I was planning on using defining additional Vdisk as follows:
Def vfb-512 * allocate 1GB
As others have mentioned, you may or may not want to do this. For me, adding
another 1GB of VDISK to several guests is probably not a good thing. If, as
Willemina mentioned, you're not seeing _active_ paging _rates_, I would
allocate real DASD instead. If it's going to get written out and then not
referenced again for a very long time, you don't need it to be in virtual
storage in z/VM. If you are seeing active paging rates, then you would be
better off adding memory to the guests and let z/VM do the paging.
Mark Post
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