LSF_DNS_CACHE

Syntax

LSF_DNS_CACHE=Y|y|N|n

Description

When set to Y, LSF generates a cluster-wide DNS host cache to improve cluster startup performance

To mitigate the burden on the DNS server when starting the LSF cluster, a cluster-based cache file ($LSF_ENVDIR/.hosts.dnscache) is used by all daemons on each host to reduce the number of times that LSF daemons directly call the DNS server.

The format of the cache file is the same as $LSF_ENVDIR/hosts: 
IPAddress OfficialName AliasName

For shared installations, the management host LIM creates the DNS host cache file ($LSF_ENVDIR/.hosts.dnscache) if the file does not exist. The mbatchd daemon periodically flushes the local host cache information into the DNS host cache file.

For non-shared installations, LIM creates the DNS host cache file ($LSF_TMPDIR/.hosts.dnscache) if the file does not exist. LIM periodically flushes local host cache information into the DNS host cache file.

When the IP address or hostname is changed on the DNS server side, LSF daemons can directly call the DNS server to obtain the updated information before the DNS host cache file is flushed with the updated information.

Default

N