Very usefull Command

svmon
svmon -P 

Further:
use can user svmon command to monitor memory usage as follows;

(A) #svmon -P -v -t 10 | more         (will give top ten processes)
(B) #svmon -U -v -t 10 | more         ( will give top ten user)

smit install requires "inutoc ." first.  It'll autogenerate a .toc for you
I believe, but if you later add more .bff's to the same directory, then
the inutoc . becomes important.  It is of course, a table of contents.

dump -ov /dir/xcoff-file

topas, -P is useful # similar to top

When creating really big filesystems, this is very helpful:
chlv -x 6552 lv08
Word on the net is that this is required for filesystems over 512M.

esmf04m-root> crfs -v jfs -g'ptmpvg' -a size='884998144' -m'/ptmp2'
-A''`locale yesstr | awk -F: '{print $1}'`'' -p'rw' -t''`locale yesstr |
awk -F: '{print $1}'`'' -a frag='4096' -a nbpi='131072' -a ag='64'
Based on the parameters chosen, the new /ptmp2 JFS file system
is limited to a maximum size of 2147483648 (512 byte blocks)
New File System size is 884998144
esmf04m-root>

If you give a bad combination of parameters, the command will list
possibilities.  I got something like this from smit, then seasoned
to taste.

If you need files larger than 2 gigabytes in size, this is better.
It should allow files up to 64 gigabytes:
crfs -v jfs -a bf=true -g'ptmpvg' -a size='884998144' -m'/ptmp2' -A''` |
 |   locale yesstr | awk -F: '{print $1}'`'' -p'rw' -t''`locale yesstr | aw |
 |   k -F: '{print $1}'`'' -a nbpi='131072' -a ag='64'   

Show version of SSP (IBM SP switch) software:
lslpp -al ssp.basic

llctl -g reconfig - make loadleveler reread its config files

oslevel (sometimes lies)
oslevel -r (seems to do better)

lsdev -Cc adapter

pstat -a looks useful

vmo is for VM tuning

On 1000BaseT, you really want this:
chdev -P -l ent2 -a media_speed=Auto_Negotiation

Setting jumbo frames on en2 looks like:
ifconfig en2 down detach
chdev -l ent2 -a jumbo_frames=yes
chdev -l en2 -a mtu=9000
chdev -l en2 -a state=up

Search for the meaning of AIX errors:
http://publib16.boulder.ibm.com/pseries/en_US/infocenter/base/eisearch.htm 


nfso -a shows AIX NFS tuning parameters; good to check on if you're
getting badcalls in nfsstat.  Most people don't bother to tweaks these
though.

nfsstat -m shows great info about full set of NFS mount options

Turn on path mtu discovery
no -o tcp_pmtu_discover=1
no -o udp_pmtu_discover=1
TCP support is handled by the OS.  UDP support requires cooperation
between OS and application.

nfsstat -c shows rpc stats

To check for software problems:
lppchk -v
lppchk -c
lppchk -l

List subsystem (my word) status:
lssrc -a
mkssys
rmssys
chssys
auditpr
refresh
startsrc
stopsrc
traceson
tracesoff

This starts sendmail:
startsrc -s sendmail -a "-bd -q30m"

This makes inetd reread its config file.  Not sure if it kills and
restarts or just HUP's or what:
refresh -s inetd

lsps is used to list the characteristics of paging space.

Turning off ip forwarding:
/usr/sbin/no -o ipforwarding=0

Detailed info about a specific error:
errpt -a -jE85C5C4C
BTW, Rajiv Bendale tells me that errors are stored in NVRAM on AIX,
so you don't have to put time into replicating an error as often.

Some or all of these will list more than one number.  Trust the first,
not the second.

lslpp -l ppe.poe
...should list the version of poe installed on the system

Check on compiler versions:
lslpp -l vac.C
lslpp -l vacpp.cmp.core

Check on loadleveler version:
lslpp -l LoadL.full

If you want to check the bootlist do bootlist -o -m normal if you want to
update bootlist do bootlist -m normal hdisk* hdisk* cd* rmt*

prtconf

Run the ssadiag against the drive and the adapter and it will tell you if it
fails or not. Then if its a hot plugable it can be replaced online.