==== User management ====
== Account unlock ==
<code bash>
chsec -f /etc/security/lastlog -a "unsuccessful_login_count=0" -s 'myuser'
pwdadm -c /*Clear ADMCHG flag*/
</code>

== Sendmail ==
<code bash>
# show sendmail status
lssrc -c sendmail

startsrc -s sendmail -a "-bd -q30m" 

</code>

<code bash>
 proctree 8196
 ps -fk | grep wait
 
vmstat -v
              5505024 memory pages
              5331905 lruable pages
                41883 free pages
                    1 memory pools
              1302902 pinned pages
                 80.0 maxpin percentage
                  3.0 minperm percentage
                 90.0 maxperm percentage
                  4.0 numperm percentage
               216938 file pages
                  0.0 compressed percentage
                    0 compressed pages
                  4.0 numclient percentage
                 90.0 maxclient percentage
               216938 client pages
                    0 remote pageouts scheduled
                  390 pending disk I/Os blocked with no pbuf
               616769 paging space I/Os blocked with no psbuf
                 2236 filesystem I/Os blocked with no fsbuf
               100811 client filesystem I/Os blocked with no fsbuf
              2882029 external pager filesystem I/Os blocked with no fsbuf
                 95.3 percentage of memory used for computational pages
                 
                 
[srvbd1]root]/]>vmstat -tw 1

System configuration: lcpu=4 mem=7952MB

 kthr          memory                         page                       faults           cpu       time
------- --------------------- ------------------------------------ ------------------ ----------- --------
  r   b        avm        fre    re    pi    po    fr     sr    cy    in     sy    cs us sy id wa hr mi se
  0   0     702600    1052811     0     0     0     0      0     0     2   6268  7339  0  1 99  0 11:52:31
  0   0     702602    1052809     0     0     0     0      0     0     4   5902  7045  0  1 99  0 11:52:32
  0   0     702602    1052809     0     0     0     0      0     0     5   5991  6883  0  1 99  0 11:52:33
  0   0     702602    1052809     0     0     0     0      0     0     4   5913  6100  0  1 99  0 11:52:34
  
  [srvbd1]root]/]>svmon -G
               size      inuse       free        pin    virtual
memory      2035712     982932    1052780     384894     702631
pg space    2097152       2404

               work       pers       clnt      other
pin          314839          0          0      70055
in use       702631        240     280061

PageSize   PoolSize      inuse       pgsp        pin    virtual
s   4 KB          -     935236       2404     361214     654935
m  64 KB          -       2981          0       1480       2981            


[srvbd1]root]/]>lscfg
INSTALLED RESOURCE LIST
</code>

==== Monitoring ====
nmon
mpstat
sar

== Processor Binding ==
<code bash>
bindprocessor -q
The available processors are:  0 1

bindprocessor 14662 1

ps -emo THREAD | grep p1

#unbind
bindprocessor -u 14662
</code>

== SMT (Simultaneous Multithreading) ==
You can enable or disable SMT by running the smtctl command.\\

<code bash>
smtctl [ -m off | on [ -w boot | now]]

The following options are available:

-m off
    Sets SMT mode to disabled. 
-m on
    Sets SMT mode to enabled. 
-w boot
    Makes the SMT mode change effective on next and subsequent restarts if you run the bosboot command before the next system restart. 
-w now
    Makes the SMT mode change immediately but the change does not persist across restart. 
</code>

If neither the -w boot or the -w now options are specified, the mode change is made immediately. It persists across subsequent restarts if you run the bosboot command before the next system restart.

== Processor control ==
Setting this tunable to a value greater than -1 will enable the scheduler to enable and disable virtual processors based on the partition's CPU utilization.\\

If vpm_xvcpus is greater than or equal to zero, processor folding is enabled. Otherwise, if it is equal to -1, folding is disabled\\

Use below command to enable folding:\\

<code bash>
schedo -o vpm_xvcpus=0
//Setting vpm_xvcpus to 0

schedo -L vpm_xvcpus

schedo -o vpm_fold_policy=0
schedo -L vpm_fold_policy
</code>

Note: By default processor folding enabled in AIX\\


== Smitty ==
[[http://www.redbooks.ibm.com/redpapers/pdfs/redp0105.pdf| AIX System Management Interface Tool (SMIT) Redbook]]