3 ms·

"PCI Hot Plug User’s Guide 2.3" by Fujitsu for their SPARC-based servers is copyrighted 2003: * https://www.fujitsu.com/downloads/SFTWR/manual/s_e/b23pav1h0h/c

"PCI Hot Plug User’s Guide 2.3" by Fujitsu for their SPARC-based servers is copyrighted 2003: * https://www.fujitsu.com/downloads/SFTWR/manual/s_e/b23pav1h0h/c120e199/01/C120-E199-01EN.pdf https://www.fujitsu.com/downloads/SFTWR/manual/s_e/b23pav1h0... Being able to hot-plug cards in/out of slots has been a thing for higher-end gear for a long time. I'm sure the IBM Mainframe folks did it many decades ago like they've seem to have done for many things that the 'commodity' server folks are only now catching up to.

rbanffy 5y ago
> I'm sure the IBM Mainframe folks did it many decades ago They could do that with CPU modules a couple generations back. I don't think the newer ones can do it though, at least not a CPU at a time. It's probably possible to power off a CPU drawer (4 CPUs on the Z15, IIRC) without too much hassle. I remember seeing a colleague of mine doing it with memory and CPUs on a live Ultra Enterprise 4000, again, with memory and CPU. IIRC, he had to tell the OS the board was going to be pulled out before doing so and a light would signal it was safe to proceed. He was doing that because we used one machine to process a lot of logs overnight (in 1997).
- p_l 5y ago
  CPU/memory live replacement in IBM mainframes is done on per-book basis IIRC. Used to be that single book had one or two CPU complexes (often each cpu was actually two running lockstep) but these days the density went way up.
justsomehnguy 5y ago
Hot-pluggableness is baked in PCI/PCI-E right in. I definitely hot plugged PCI cards on absolutely not hot-plug certified consumer motherboards. If you are not slamming it in it would work just fine. Hot unplug, on the other hand... Still, if you are on any Windows machine - just disable it in DevMgr, it would probably work just fine.

3 ms·

"PCI Hot Plug User’s Guide 2.3" by Fujitsu for their SPARC-based servers is copyrighted 2003: * https://www.fujitsu.com/downloads/SFTWR/manual/s_e/b23pav1h0h/c

by throw0101a 5y ago

rbanffy 5y ago
> I'm sure the IBM Mainframe folks did it many decades ago They could do that with CPU modules a couple generations back. I don't think the newer ones can do it though, at least not a CPU at a time. It's probably possible to power off a CPU drawer (4 CPUs on the Z15, IIRC) without too much hassle. I remember seeing a colleague of mine doing it with memory and CPUs on a live Ultra Enterprise 4000, again, with memory and CPU. IIRC, he had to tell the OS the board was going to be pulled out before doing so and a light would signal it was safe to proceed. He was doing that because we used one machine to process a lot of logs overnight (in 1997).
- p_l 5y ago
  CPU/memory live replacement in IBM mainframes is done on per-book basis IIRC. Used to be that single book had one or two CPU complexes (often each cpu was actually two running lockstep) but these days the density went way up.
justsomehnguy 5y ago
Hot-pluggableness is baked in PCI/PCI-E right in. I definitely hot plugged PCI cards on absolutely not hot-plug certified consumer motherboards. If you are not slamming it in it would work just fine. Hot unplug, on the other hand... Still, if you are on any Windows machine - just disable it in DevMgr, it would probably work just fine.