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Operating Systems AIX tuning network parameters : parameters not persist after reboot Post 302378674 by dantares on Tuesday 8th of December 2009 12:35:55 PM
Old 12-08-2009
tuning network parameters : parameters not persist after reboot

Hello,

On Aix 5.2, we changed the parameters tcp_keepinit, tcp_keepintvl and tcp_keepidle with the no command.

tunrestore -R is present in inittab

in the directory /etc/tunables we can clearly see the inclusion of parameters during reboot, including the file lastboot.log
Code:
  root#/etc/tunables#ls -ltr
total 40
-rw-r--r--   1 root     system          493 Nov  5 17:38 nextboot
-rw-r--r--   1 root     system          334 Dec  3 17:39 lastboot.log
-rw-r--r--   1 root     system        11735 Dec  3 17:39 lastboot

  root#/etc/tunables#grep keep nextboot
       tcp_keepinit = "40"
       tcp_keepintvl = "20"
       tcp_keepidle = "600"

  root#/etc/tunables#grep keep lastboot.log
Setting tcp_keepidle to 600
Setting tcp_keepinit to 40
Setting tcp_keepintvl to 20
  
root#/etc/tunables#grep keep lastboot
       ndpt_keep = "120"               # DEFAULT VALUE
       tcp_keepcnt = "8"               # DEFAULT VALUE
       tcp_keepidle = "600"
       tcp_keepinit = "40"
       tcp_keepintvl = "20"

But when we checked with the no command, the parameters are not valid

Code:
  root#/etc/tunables#no -L | grep keep |grep -v cnt |grep -v ndpt
tcp_keepidle              6840   14400  600    1      8E-1   halfsecond  C
tcp_keepinit              40     150    40     1      8E-1   halfsecond  D
tcp_keepintvl             110    150    20     1      32K-1  halfsecond  C
  
root#/etc/tunables#no -a | grep keep |grep -v cnt |grep -v ndpt
            tcp_keepidle = 6840
            tcp_keepinit = 40
tcp_keepintvl = 110

is it because of the pre520tune parameter is disabled?

Code:
  root#/etc/tunables#lsattr -E -l sys0 |grep pre520
pre520tune      disable               Pre-520 tuning compatibility mode    
      True

have you a solution for this problem?

thank you for your answers

Last edited by zaxxon; 12-09-2009 at 11:35 AM.. Reason: code tags please
 

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dbc_max_pct(5)							     OBSOLETED							    dbc_max_pct(5)

NAME
dbc_max_pct, dbc_min_pct, bufcache_max_pct, bufpages, nbuf - OBSOLETED kernel tunable parameter DESCRIPTION
These tunables have been obsoleted and removed. Do not make any changes to these tunables, as they have no effect on the kernel. Use the file cache tunables and (see filecache_max(5)). In previous releases, the tunables and were used to set limits to the dynamic buffer cache, and the tunables and were used for tuning the buffer cache when a static cache was desired. This release of HP-UX offers improved file caching technology and improved physical memory control associated to caching file I/O data. The number of tunable parameters used to control file caching memory usage is reduced from five to two, and previous usability issues are addressed. Restrictions on Changing These tunables should not be modified. Attempting to tune any of the obsolete buffer cache tunables, or results in an error. Use the tunables and to set limits on the file cache. Note that, on a any given system, the optimum values of these two new tunables are not necessarily equivalent to the optimum values of the obsolete buffer cache tunable values in the older systems. You should first deter- mine if the new default values yield acceptable performance on your system, before attempting to change the values of the new file cache tunables. AUTHOR
and were developed by HP. SEE ALSO
filecache_max(5). Kernel Tunable Parameter dbc_max_pct(5)
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