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It all comes down to what do you want to prioritize here. |
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If you want minimal downtimes in case that there's a power source |
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failure of any kind, then you probably want ext4 which will give you |
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the fastest fsck times. Or, you might want to check into sqashfs on a |
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flash drive for your rootfs and use whatever else for writable parts |
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(/tmp,/var/log/, etc.), and update only when strictly necessary (GLSAs |
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can probably help you there). After all, as someone else said above, |
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this machine just needs to do one thing, and do it well. If you plan |
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to make stage4/5/6 or whatever the trend is nowadays to name it, you |
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don't even need portage or a toolchain in that box, and having it will |
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only be a security risk since some rootkits comes in the form of a |
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kernel module that needs to be compiled for your specific kernel and |
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architecture (eliminating the kernel sources and the compiler you sort |
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that out from the very root). |
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In any case, the cpu won't be a limiting factor or a bottleneck, |
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whatever your definitive choice shall be. |
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Jesús Guerrero Botella |