On Mar 31, 2004, at 12:01 AM, Nicolas Bougues wrote:
- hardware : you must have hotplug capable boards and bus. I believe the only option there is CompactPCI, and of course cPCI boards and chassis are very different from your day-to-day PCI stuff. Of course Digium boards, as well as any other standard PCI board does not fit. cPCI boards and chassis are considerably more expensive than their standard counterparts, if they exist at all.
You can't just hot (un)plug a standard PCI board : the bus is not meant for this, you have most chances of destroying your board and/or your bus.
You can buy systems with hot-plugable standard PCI slots. Many higher-end servers have included the ability for years.
Example: http://h18004.www1.hp.com/products/servers/proliantml530/index.html
If you read down far enough, it mentions that the PCI-X slots are hot-pluggable. Linux has kernel support for the HP/COMPAQ/IBM hot-plug chips, but I'm pretty sure that you still need a bit of driver support.
I haven't tried with a recent Compaq, but a couple of years ago the hot plug slots were a joke. It was nearly impossible to swap a card without disturbing the others in the chassis, and crashing the server. The cards did not slide out cleanly; ribbon cables for RAID drives ran across the top of the hot plug slots; etc. So, watch out - you need slots which are hot plug in deed as well as in word :-)
Regards, Steve
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