Friday, January 20, 2012

Kernel Parameters in AIX (Part 1)

Kernel Parameters in AIX (Part 1)


tunchange Command Examples

    To update the pacefork parameter in the /etc/tunables/nextboot file, type:

    tunchange -f nextboot -t schedo -o pacefork=10

    To update the pacefork parameter in the /home/mine/mytunable file, type:

    tunchange -f /home/mine/mytunable -t schedo -o pacefork=10

    To reset all schedo stanza parameters to their default value in the /etc/tunables/nextboot file, type:

    tunchange -f nextboot -t schedo -D

    To merge the /home/mine/mytunable file with the /etc/tunables/nextboot file, type:

    tunchange -f nextboot -m /home/mine/mytunable

Files
/usr/sbin/tunchange Contains the tunchange command.
/etc/tunables/ Contains the default tunable files.

/etc/tunables/nextboot

Other Commands:


# no -a | more
                 arpqsize = 12
               arpt_killc = 20
              arptab_bsiz = 7
                arptab_nb = 149
                bcastping = 0
      clean_partial_conns = 0
                 delayack = 0
            delayackports = {}
         dgd_packets_lost = 3
            dgd_ping_time = 5
           dgd_retry_time = 5
       directed_broadcast = 0
                 fasttimo = 200
        icmp6_errmsg_rate = 10
=======   etc =========

# lsattr -E -l sys0 | more

SW_dist_intr    false              Enable SW distribution of interrupts              True
autorestart     true               Automatically REBOOT OS after a crash             True
boottype        disk               N/A                                               False
capacity_inc    1.00               Processor capacity increment                      False
capped          true               Partition is capped                               False
conslogin       enable             System Console Login                              False

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