To configure devices and installs device software in system:

root@gz~# cfgmgr

To configure the components connected to the vscsi0 interface:

root@gz~# cfgmgr -l vscsi0

To display config, diagnostics and vital product definition info:

root@gz~# lscfg

Display info about device mem0:

root@gz~# lscfg -l mem0

Display info about all Ethernet cards:

root@gz~# lscfg -l ent*

Display vpd:

root@gz~# lscfg -v

Display vpd of hdisk0:

root@gz~# lscfg -v -l hdisk0

How to display the PVID of a disk:

root@gz~# lquerypv -H /dev/hdisk0

To change device rmt0 from defined state to available state:

root@gz~# mkdev -l rmt0

To lists all supported devices:

root@gz~# lsdev -P

To list all supported disks:

root@gz~# lsdev -P -c disk

To display supported class:

root@gz~# lsdev -P -r class

To display all sub class:

root@gz~# lsdev -P -r subclass

To lists all configured devices:

root@gz~# lsdev -C

To display the properties of mem0:

root@gz~# lsdev -C -l mem0

To change default maxuproc value to 100:

root@gz~# chdev -l sys0 -a maxuproc=100

To change aio0 parameters (below AIX 6.1):

root@gz~# chdev -l aio0 -P -a minservers=150 -a maxservers=150

Note: modifications to aio0 require restart. If you try to modify them on the fly (without -P), you will get the following error:

root@gz~# chdev -l aio0 -a minservers=150 -a maxservers=150
Method error (/usr/lib/methods/chgaio):
        0514-064 Cannot perform the requested function because the
                 AIO kernel extension is permanent and cannot be unloaded.

To change the block size to 512:

root@gz~# chdev -l rmt0 -a blocksize=512

To avoid tape retension:

root@gz~# chdev -l rmt0 -a ret=no

To remove the device rmt0:

root@gz~# rmdev -l rmt0

To remove the device totally from database:

root@gz~# rmdev -d -l rmt0
Note: If an hdisk is removed with the rmdev -l hdiskx -d command, then the hdisk name is available for use by another disk.

To change the state of the device stopped:

root@gz~# rmdev -l rmt0 -S

To display possible parent devices which accept rs232 devices:

root@gz~# lsparent -C -k rs232

To display parent devices which accept child device hdisk0:

root@gz~# lsparent -C -l hdisk0

To see the default values of the device rmt0:

root@gz~# lsattr -Dl rmt0

To see the current values of the device rmt0:

root@gz~# lsattr -El rmt0

To see all possible values of the login attribute of tty0:

root@gz~# lsattr -El tty0 -a login -R

To list all possible connection scsi0 can accept:

root@gz~# lsconn -p scsi0

To list the available major numbers:

root@gz~# lvlstmajor

How to create null device with major (2) and minor (2) nos. (c - char device):

root@gz~# mknod /dev/null c 2 2

How to check the sdd disk reservation:

root@gz~# lquerypr -Vh /dev/vpath0

How to check on which drawers you have the pci devices:

root@gz~# lsslot -c pci
# Slot                   Description                              Device(s)
U5602.003.9480047-P1-C8  PCI-E capable, Rev 1 slot with 8x lanes  fcs0 fcs1 
U5602.003.9480047-P1-C9  PCI-E capable, Rev 1 slot with 8x lanes  fcs2 fcs5