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Operating Systems AIX Port hang issue in AIX Version 5.3 Post 302343816 by subharai on Thursday 13th of August 2009 05:01:39 PM
Old 08-13-2009
Question

We have confirmed the same from the development team that there is no such setting for the max. no of connections allowed to the ports. Moreover from our analysis point of view the no. 300 may not be hard coded because everytime the no. of established connection varies before the ports get into hanged status, but everytime it is > 300.

Few quick questions for better understanding of the issue:-

1.Is there any other workaround available to analyze from OS point of view before throwing the ball to the application developers court?

2.Please let me know what may be the possible reason or the scenarios where ports remain in ESTABLISHED status.

3. Is there any system timeout variable/parameter from AIX point of view where we can mention the time after which the established connection will get automatically closed.

4. Does established connection for a long time mean an IDLE conection?

5. Is there any possibility that due to some never ending processes these connections are getting created with time?

Being very much new to the platform, asked you all the above questions for better understanding of the issue. Thanks in advance.
 

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Smokeping_probes_AnotherSSH(3)					     SmokePing					    Smokeping_probes_AnotherSSH(3)

NAME
Smokeping::probes::AnotherSSH - Another SSH probe SYNOPSIS
*** Probes *** +AnotherSSH forks = 5 offset = 50% step = 300 # The following variables can be overridden in each target section greeting = SSH-Latency-Measurement-Sorry-for-this-logmessage interval = established mininterval = 0.5 pings = 5 port = 22 timeout = 5 # [...] *** Targets *** probe = AnotherSSH # if this should be the default probe # [...] + mytarget # probe = AnotherSSH # if the default probe is something else host = my.host greeting = SSH-Latency-Measurement-Sorry-for-this-logmessage interval = established mininterval = 0.5 pings = 5 port = 22 timeout = 5 DESCRIPTION
Latency measurement using SSH. This generates Logfile messages on the other Host, so get permission from the owner first! VARIABLES
Supported probe-specific variables: forks Run this many concurrent processes at maximum Example value: 5 Default value: 5 offset If you run many probes concurrently you may want to prevent them from hitting your network all at the same time. Using the probe- specific offset parameter you can change the point in time when each probe will be run. Offset is specified in % of total interval, or alternatively as 'random', and the offset from the 'General' section is used if nothing is specified here. Note that this does NOT influence the rrds itself, it is just a matter of when data acqusition is initiated. (This variable is only applicable if the variable 'concurrentprobes' is set in the 'General' section.) Example value: 50% step Duration of the base interval that this probe should use, if different from the one specified in the 'Database' section. Note that the step in the RRD files is fixed when they are originally generated, and if you change the step parameter afterwards, you'll have to delete the old RRD files or somehow convert them. (This variable is only applicable if the variable 'concurrentprobes' is set in the 'General' section.) Example value: 300 Supported target-specific variables: greeting Greeting string to send to the SSH Server. This will appear in the Logfile. Use this to make clear, who you are and what you are doing to avoid confusion. Also, don't use something that is a valid version string. This probe assumes that the connection gets terminated because of protocol mismatch. Default value: SSH-Latency-Measurement-Sorry-for-this-logmessage interval The interval to be measured. One of: connect Interval between connect() and the greeting string from the host. established Interval between our greeting message and the end of the connection because of Protocol mismatch. This is the default. complete From connect() to the end of the connection. Default value: established mininterval Minimum interval between the start of two connection attempts in (possibly fractional) seconds. Default value: 0.5 pings How many pings should be sent to each target, if different from the global value specified in the Database section. Note that the number of pings in the RRD files is fixed when they are originally generated, and if you change this parameter afterwards, you'll have to delete the old RRD files or somehow convert them. Example value: 5 port Connect to this port. Default value: 22 timeout Timeout for the connection. Default value: 5 AUTHORS
Christoph Heine <Christoph.Heine@HaDiKo.DE> 2.6.8 2013-03-17 Smokeping_probes_AnotherSSH(3)
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