On 1/25/2010 2:41 PM, staze wrote:
I had not. It was indeed a 1 min poll interval, and 1 minute delay. I've just
upped that to 2 minutes, and we'll see if that fixes it. I'm currently testing
it just on one of the Xserve RAIDs to see if the other continues to error out.
It kinda seems like something where, if Intermapper doesn't get a response to a
poll, it should try again sooner than the poll interval.
So normally, it would poll every 60 seconds. If it polls one time, doesn't get
a response, it should try again in like 10 seconds to see if the lack of
response was a transient issue, or the system is really down. Only after a
couple of those quicker test polls should the device be considered down.
Is there than functionality, or plan for it?
Thanks.
Here is some additional information on the polling cycle that you might
find helpful.
1. In TCP probes (SMTP, HTTP, etc.) InterMapper reports an outage
because it has failed to establish a connection within 60 (the default)
seconds. InterMapper relies on the underlying OS facility to retransmit
the SYN/SYN/ACK packets until it works or it has failed multiple times.
The Xserve probes are TCP probes.
Consequently, if InterMapper reports an outage of a TCP-based probe, it
has definitively failed. There have been several attempts to start the
connection (using the TCP retry algorithm, with exponential backoff,
etc.) and it's fair to say that at least one device (InterMapper) has
already failed to connect. There's no need to retry again.
2) For UDP probes (Ping, SNMP, etc.) InterMapper sends N requests
(default is three attempts) spaced M seconds apart (default is three -
both parameters are settable) before declaring the device to be down.
In this case, too, if InterMapper reports an outage, the device has
failed to respond to a number of short-interval requests, and there's no
additional need to retry.
Regards,
Janice Losgar
Dartware, LLC
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