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Full Discussion: Login Process takes longer
Top Forums UNIX for Advanced & Expert Users Login Process takes longer Post 302141485 by cbkihong on Friday 19th of October 2007 08:24:36 AM
Old 10-19-2007
I usually use strace to have an idea of what a program is doing. Of course, if you do not have some C programming background the output may not make enough sense to you. It outputs the system calls being called. You can look at the neighbouring system calls around places where large latencies occur to give you an idea what happened at that time.

One possibility that I encounter recently is that reverse DNS of IPv4 addresses is down or simply being slow. In that case, the SSH process may need to timeout before trying another one. MySQL has similar issues as well.
 

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LEARN ABOUT DEBIAN

fence_brocade

fence_brocade(8)					      System Manager's Manual						  fence_brocade(8)

NAME

       fence_brocade - I/O Fencing agent for Brocade FC switches

SYNOPSIS

       fence_brocade [OPTION]...

DESCRIPTION

       fence_brocade  is an I/O Fencing agent which can be used with Brocade FC switches.  It logs into a Brocade switch via telnet and disables a
       specified port.	Disabling the port which a machine is connected to effectively fences that machine.  Lengthy  telnet  connections  to  the
       switch should be avoided while a GFS cluster is running because the connection will block any necessary fencing actions.

       fence_brocade  accepts  options	on the command line as well as from stdin.  fenced sends parameters through stdin when it execs the agent.
       fence_brocade can be run by itself with command line options which is useful for testing.

       After a fence operation has taken place the fenced machine can no longer connect to the Brocade FC switch.   When  the  fenced  machine	is
       ready  to  be  brought  back into the GFS cluster (after reboot) the port on the Brocade FC switch needs to be enabled. This can be done by
       running fence_brocade and specifying the enable action.

       Vendor URL: http://www.brocade.com

OPTIONS

       -a IPaddress
	      IP address of the switch.

       -h     Print out a help message describing available options, then exit.

       -l login
	      Login name for the switch.

       -n port
	      The port number to disable on the switch.

       -o action
	      The action required.  disable (default) or enable.

       -p password
	      Password for login.

       -S path
	      Full path to an executable to generate the password for login.

       -q     Quiet mode: print only error messages.

       -V     Print out a version message, then exit.

STDIN PARAMETERS

       agent = < param >
	      This option is used by fence_node(8) and is ignored by fence_brocade.

       ipaddr = < hostname | ip >
	      IP address or hostname of the switch.

       login = < param >
	      Login name.

       option = < param >
	      The action required.  disable (default) or enable.

       passwd = < param >
	      Password for login.

       passwd_script = < param >
	      Full path to an executable to generate the password for login.

       port = < param >
	      The port number to disable on the switch.

SEE ALSO

       fence(8), fence_node(8)

																  fence_brocade(8)
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