On 6/16/19 8:37 PM, Manuel McLure wrote:
For example, per IBM for AIX
(https://developer.ibm.com/articles/au-aix7memoryoptimize3/):
"A more sensible rule is to configure the paging space to be half the
size of RAM plus 4GB with an upper limit of 32GB. In systems with more
than 32GB of RAM, or on systems where you are using LPAR and WPAR to
help split your workload, you can be significantly more selective and
specific about your memory requirements."
~chuckle~
This brings to mind a story at my last job where someone on another team
supporting another customer was doing an emergency change to add SAN
based swap space to an AIX server so that it would not run out of memory
and crash. There was a very badly written application that was
mallocing memory and never freeing it. So it was leaking memory and AIX
was swapping the unused pages out of physical RAM to the page files.
They had about 600 GB of swap allocated and the change was to add
another 200 GB of swap so that they could make it to the next quarterly
reboot in a couple of weeks.
