After several rounds of crawling around the back of the space under the
desk, dis-connecting one desktop and connecting another desktop, looking
at this and that, doing some math, and whatever else, here's what I come
up with. I limited my attention to /boot and its sub-directories. I
use "kernel" loosely, in a general way.
> the current "kernel" is about 100 MB (initramfs* + config* +
System.map + vmlinuz* + others)
> the "rescue" is about twice the size of the current "kernel".
> total space needed to start...
= current + 5 old + "rescue" = 6 * current + 2 * current
= 8 * the current "kernel"
= 800 MB.
> the "kernel" grows about 20% per year.
Wanting to keep 5 old "kernels", and wanting /boot to accommodate 10
years of growth, /boot should be allotted
(1 + (growth rate as a percent / 100) ^ years) * starting size
= (1.2 ^ 10) * 800 MB
= about 5 GB.
I'm still waiting for hardware shipments to arrive.
--
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