On Sun, 2015-02-15 at 17:37 -0800, Keith Keller wrote:
> On 2015-02-15, Gregory P. Ennis <PoMec@xxxxxxxxx> wrote:
> >
> > I am putting together a new mail server for our firm using a SuperMicro
> > with Centos 7.0. When performed the install of the os, I put 16 gigs of
> > memory in the wrong slots on the mother board which caused the
> > SuperMicro to recognize 8 gigs instead of 16 gigs. When I installed
> > Centos 7.0, this error made the swap file 8070 megs instead of what I
> > would have expected to be a over 16000 megs.
>
> You lucked out, honestly. You really don't want 8GB of swap on your
> system. What will most likely happen is that you'll have a process that
> starts running away eating memory, and it'll try to use all of that swap
> before the kernel's OOM killer can kick in. You will not enjoy
> thrashing 8GB of swap for probably hours.
>
> Really what you should do is drastically reduce the amount of swap you
> have allocated, and reclaim most of that 8GB of swap space for storage
> filesystems. In my experience, a few hundred MB of swap is more than
> sufficient to be able to swap out seldom-used memory while not taking
> too long to OOM. If you really find a need for more swap later, you can
> allocate a swap file; it's slightly less efficient than a swap
> partition, but compared to real memory the difference will be
> negligible.
>
> --keith
>
I am sure glad I did not start over on the installation. Thank you to
everyone for the information and education!!!!!
Thanks again!!!!
Greg
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