On Fri, 2004-09-17 at 21:04, Ricardo Araújo wrote:
> 1) What could make a server lock that badly?
Hard to say. Some important facts you've omitted:
Whether the completely new hardware included new disks (it has to be
asked - I've had people tell me before "totally different server" but
the moved the f***ing disks across)
Whether any data was copied across, and if so what data
What sort of disks you're using
The way the server locks up. Does it just suddenly cease responding?
Are there any flashing keyboard LEDs or not (ie is it panicing, or just
locking hard)? Is there any response on the console?
Does the server run X?
Does the server respond to pings once it's crashed? (There are a number
of cases I've encountered where a linux server will respond to ICMP and
do the early SYN->SYN+ACK->ACK for TCP conns even though there is no
response to keyboard input and it's otherwise unresponsive. Weird, eh?)
Tip: run 'setterm -blank 0' on a virtual console and leave that console
active 24/7 with dmesg set to a very high value and syslog set to
broadcast messages to that console. It can be very, very informative.
I also like to run something like 'vmstat 1 > /tmp/vmlog &' as it can
get you an idea of if the server is doing anything odd before it
crashes.
> 2) Can problems in some client cause this? If yes, could it be too old
> hardware (network card, maybe)?
I can't see how, but I've been in the computer industry long enough now
to never, ever, ever say the "impossible" word.
> 3) Could it be some network problem (switches, cables)? Maybe some strange
> packet that makes the server lock?
I'd be very surprised.
--
Craig Ringer
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