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RISC-V chips will support replacing RAM sticks without powering off the system — hot plugging functionality arriving in newer flavors of Linux (www.tomshardware.com)

submitted 1 week ago by [email protected] to c/[email protected]

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[-] [email protected] 21 points 1 week ago

I don't understand how this is an advantage. Yes, you can swap RAM with the system powered up, but what happens to the information in the module that was removed? Is the OS doing some kind of RAID-like memory allocation? The article wasn't clear on how this would actually work.

[-] [email protected] 19 points 1 week ago

Apparently, there's some coordination mechanism, where you tell the OS that you want to remove a certain memory stick, so it moves all the memory onto other RAM sticks (or uses paging to move it to your hard drive). Only then would you actually physically unplug the memory stick.

See, for example: https://docs.kernel.org/admin-guide/mm/memory-hotplug.html
(Mind that this is kernel documentation. If you actually want to do this, there's probably some CLI program to make it easier.)

[-] [email protected] 16 points 1 week ago

Then it's not Hot Swap, just Lukewarm Swap?

[-] [email protected] 17 points 1 week ago

I guess, you could see it that way...? The important part is that you don't have to turn off the whole system. It can continue running without interruption. So, the RAM will be lukewarm when you swap it, but the system will still be hot.

[-] [email protected] 9 points 1 week ago

If you really want to be pedantic you could setup raid 1+0 or 5 and live the true RAM hot swapping life

[-] [email protected] 2 points 1 week ago

So "warm plugging" is a thing - it means a piece of hardware is detachable while the machine is asleep.

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this post was submitted on 03 Jul 2024

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