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how to check and change kernel parameter and tcp/ip parameters in IBM-AIX?

Posted on 2009-05-01
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how to check and change kernel parameter and tcp/ip parameters in IBM-AIX?
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Question by:umesh4exp
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woolmilkporc earned 2000 total points
ID: 24285533
Hi,

1) check

a) general system environment: lsattr -El sys0
b) tunables for virtual memory manager, file system, LVM: vmo -a
c) scheduler tunables: schedo -a
d) general IP: lsattr -El inet0
e) interface specific IP: ifconfig -a
f) interface driver specific: lsattr -El en[0-n]
g) interface hardware specific: lsattr -El ent[0-n]
h) IP tunables: no -a
i) NFS tunables: nfso -a
j) I/O subsystem tunables: ioo -a

Notes: With lsattr, 'true' in the last column indicates 'user settable'. en[0-n]. ent[0-n] means en0, en1, en2 ... or ent0, ent1, ent2 ... according to the names and number of your ethernet interfaces.

2) set

a,d,f,g) lsattr displays attributes of devices. So the general format to set/change those attributes is
chdev -l [device] -a [attribute=value]   e.g. chdev -l sys0 -a autorestart=false
e) TCP/IP parameters are set using 'mktcpip'
b,c,h,i,j) general format for changing tunables is [command] [-p] -o [tunable=value] where -p makes changes permanent across reboots. e.g.  no -p -o thewall=524288 . no -h [tunable] gives help for each tunable value.

3) You can use smitty for most of the above:
'smitty system', 'smitty tcpip', 'smitty netinterface', 'smitty chif', 'smitty tuning' ...
4) As you can see, AIX hast settable/tunable parameters for almost everything. Please come back and ask specific questions, should there be any, since explaining all the above in detail would be far to much to write it down here.

HTH

Cheers

wmp

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