On Tue, 28 Aug 2001, Ronald G Minnich wrote:
On Tue, 28 Aug 2001, Chris Maresca wrote:
Right, but what happens when the switch barfs @ 4am 500miles away? With a serial console, I can hookup either a modem or a portmaster. If the network fails, I can call the data center, tell them "turn on modem in cage 12" and dialup do fix whatever is wrong (BTDT). That's one of the reasons why Sun hardware is so popular in server farms.
our experience is different. We've had way more trouble with serial port concentrators, cables etc. than enet switches. Overall the scenario you describe would not work well for us. It does work for many people however.
Hhhmm, unfortunetly that has not been my experience. The problem is not usually the switch, but the WAN. A site's network gets knocked over (think Yahoo's recent denial of service attack or some such), and there is no longer a way to access the machine remotely. It's in Austin, Seattle or NYC and I'm in San Francisco. Even with backend networks, it's still a huge problem. Portmasters and their ilk are very reliable once setup (but they are a b*tch to setup correctly) as are modems and phone lines.
Even when you might have a dialup to a machine on the same segment, it's possible that the machine has been so overload/damaged/whatever that it no longer responds in a meaningfull way to network connections. However, serial connection almost always works.
Note that this is the way that most large remote datacenters I have seen are setup, I would think that a serial console would be very wanted and usefull. As others have pointed out, there are companies that take advantage of this by producing products that mimick a serial console.
Another usefull and similar addition would be a BIOS based watchdog program, but that's another topic...
Chris.
-- chris maresca internet systems architect -- www.chrismaresca.com
"linux, only up 138 days, because california has flaky power... "
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