[CentOS] How often is kernel "touching" swap partition?

[m.roth at 5-cent.us]

Martin Šťastný wrote:
> Hello,
>
> I am going to buy new laptop with two drives, one SSD and one HDD and I
> want to place swap partition on HDD which will be most time unused and
> therefore spinned down. Problem is, that I don't know, if or how often is
> kernel touching swap space even if there is lot of free memory and thus
> spinning HDD up.
>
You should partition your drives anyway: a small, like 1G, partition for
/boot. For swap, the old Received Wisdom was 2-2.5 times RAM; these days,
it's "make swap to be 2G (for emergencies). Put swap on the SSD, I
*guess*... if it's enterprise grade, and not "consumer grade", which will
eventually give up with too many writes.

    mark