12-03-2013
Quote:
Originally Posted by
jlliagre
The scan rate is a value reported by the kernel. Anything non zero means there was a RAM shortage. The higher the value and the longer it stay non zero, the bigger the shortage.
Hi jlliagre,
Is there any formula to calculate scan rate?
How we relate high scan rate value with swapping activities?
Our Solaris server was hung with very high scan rate values (about 1.1 million scans/second), but swap disk is available for 52 GB from 170 GB. Memory usage is 99% of 64 GB. I don't understand why swap disk is not used when memory is full utilized.
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LEARN ABOUT DEBIAN
mdns-scan
MDNS-SCAN(1) General Commands Manual MDNS-SCAN(1)
NAME
mdns-scan - Scan for mDNS/DNS-SD services published on the local network
SYNOPSIS
mdns-scan
DESCRIPTION
mdns-scan is a tool for scanning for mDNS/DNS-SD published services on the local network. It issues a mDNS PTR query to the special RR
_services._dns-sd._udp.local for retrieving a list of all currently registered services on the local link.
OPTIONS
mdns-scan has no commandline options.
NOTES
mdns-scan is not a good mDNS citizen since it queries continuously for services and doesn't implement features like Duplicate Suppression.
It is intended for usage as a debugging tool only.
mdns-scan is incomplete since it doesn't resolve mDNS services for you - it just dumps their PTR RRs. To understand these records you need
minimal knowledge of DNS-SD and how it works.
mdns-scan does not terminate on its own behalf. It scans for services continuously until the user kills it by pressing C-c.
mdns-scan does not rely on a local mDNS responder daemon. It has no dependencies besides the GNU libc. It has been tested on Linux only.
mdns-scan does NOT scan for local mDNS enabled hosts or A/AAAA RRs, it scans for DNS-SD registered services, nothing else.
SEE ALSO
mDNSResponder(8)
AUTHOR
mdns-scan has been written by Lennart Poettering <mzqrovna@0pointer.de>
0.4 Jan 21, 2004 MDNS-SCAN(1)