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When you map a physical device from a VIOS to a LPAR, a logical device is created, called VTD. Virtual Target Device (VTD) Name, is unique on a VIOS, it'a a label, but it cannot be changed easily.

• Map a LUN on a vhost:

# mkvdev -vdev hdisk4 -vadapter vhost6  -dev labotest_b1

• Map the same LUN on multiple vhost (LPAR):

# mkvdev -f -vdev hdisk4 -vadapter vhost7  -dev labotest123_b1

• Unmap a LUN from vhost (LPAR):

# rmvdev -vtd labotest123_b1

2 ways to change the VTD name:

• unmap and remap
• use mig_name option on VTD, and do a LPAR mobility

$ chdev -dev vtd01 -attr mig_name=mig_vtd01

Apply recommended settings

$ rulescfgset  [ENTER]
Do you want to deploy default rules on top of the current system
settings now [y/N]?

Displays the differences between the factory default rules and the current system settings.

$ rules -o diff -d -s

Lists rules that will be deployed.

$ rules -o list

Lists the factory default rules.

$ rules -o list -d

Methods to disable rulescfgset message reminder after upgrading VIOS level

$ chdev -l viosrules0 -a motd=no

• On an LPAR find the corresponding vhost on VIOS:

[root@nimsrv]/etc# echo "cvai" | kdb | grep vscsi
read vscsi_scsi_ptrs OK, ptr = 0x5AB0380
vscsi1     0x000007 0x0000000000 0x0                p550-vios1->vhost0
vscsi2     0x000007 0x0000000000 0x0                p550-vios2->vhost0

• On an LPAR find the corresponding vfchost on VIOS:

[root@arwen]/root # echo "vfcs" | kdb | grep fcs
(0)> vfcs
NAME      ADDRESS             STATE   HOST      HOST_ADAP  OPENED NUM_ACTIVE
fcs2      0xF1000A00001EA000  0x0008  p7vios1   vfchost0  0x01    0x0000
fcs3      0xF1000A00001EC000  0x0008  p7vios1   vfchost1  0x01    0x0000

[root@nimsrv]/root/script/bin# kdb
           START              END <name>
0000000000001000 00000000058A0000 start+000FD8
F00000002FF47600 F00000002FFDF9C8 __ublock+000000
000000002FF22FF4 000000002FF22FF8 environ+000000
000000002FF22FF8 000000002FF22FFC errno+000000
F1000F0A00000000 F1000F0A10000000 pvproc+000000
F1000F0A10000000 F1000F0A18000000 pvthread+000000
read vscsi_scsi_ptrs OK, ptr = 0x5AB0380
(0)> cvai
NAME       STATE    CMDS_ACTIVE  ACTIVE_QUEUE       HOST
vscsi1     0x000007 0x0000000000 0x0                p550-vios1->vhost0
vscsi2     0x000007 0x0000000000 0x0                p550-vios2->vhost0

(0)> quit

Starting with AIX 7.2 TL5 SP3 (and VIOS 3.1.3.00), AIX/Power system administrators can use an alternative to kdb for viewing VIOS “identifying info” from client AIX LPAR’s. i.e.

# cat /proc/sys/adapter/fc/fcs0/hostinfo
fcs0
VFC client adapter name                   : fcs0
Host partition name  (VIOS)               : vio1
VFC host adapter name                     : vfchost0
VFC host adapter location code            : U9009.22A.7871D00-V3-C7
FC adapter name on VIOS                   : fcs2
FC adapter location code  on VIOS         : U78D3.001.WZS0AL9-P1-C8-T1

https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/IBM+Removable+Media+on+IBM+i/page/Virtual+IO+Server+(VIOS)+partition+owned+SAS+and+USB+Tape+Drives

Note: The VIO Server cannot use Atape drive when attempting to virtualize a SAS tape drive such as the 3580 to AIX client lpar. The Atape driver can be used on the running AIX client lpar.

• Attach a tape drive to a virtual SCSI adapter (do not mix disks and tape on the same virtual SCSI):

$ mkvdev -vdev rmt0 -vadapter vhost3
vttape0 Available
$ lsmap -all

SVSA            Physloc                                      Client Partition ID
--------------- -------------------------------------------- ------------------
vhost3          U9117.MMD.1089BDP-V2-C16                     0x00000017

VTD                   vttape0
Status                Available
LUN                   0x8100000000000000
Backing device        rmt0
Physloc               U2C4B.001.DBJG730-P2-C8-L1
Mirrored              N/A

• Create an etherchannel 802.3ad (LACP):

# mkvdev -lnagg ent0 ent1 ent2 ent3 -attr mode=8023ad

• Create an etherchannel in failover mode:

# mkvdev  -lnagg ent0 -attr backup_adapter=ent1

• Add or remove an adapter from an etherchannel (ent5):

# cfglnagg -add -parent ent5 ent4 ent1
# cfglnagg -rm  -parent ent5 ent4 ent1

• Create a SEA (shared ethernet adapter), ent0(physical port), ent4(virtual port into VLAN 2,with flag external access and the right priority 1 or 2):

# mkvdev -sea ent0 -vadapter ent4 -default ent4 -defaultid 2 -attr ha_mode=auto 
ent2 Available
en2
et2

• Create a SEA (shared ethernet adapter), as load sharing

#  mkvdev -sea ent0 -vadapter ent1,ent2 -default ent1 -defaultid 1 -attr ha_mode=sharing

Do not specify a control channel adapter if you have a power7 with firmware higher than 7.8

• Force a SEA (ent2) as backup adapter:

# chdev -dev ent2 -attr ha_mode=standby 

To check for a result, list errlog on both associated VIOS. Change again to auto to put it into normal mode.

• Put an IP and hostname on an adapter (en2 is the ethernet standard emulation on the SEA):

# mktcpip -hostname vio2 -interface en2 -inetaddr 9.3.5.137 -netmask 255.255.255.0 -gateway 9.3.5.41 -nsrvaddr 9.3.4.2 -nsrvdomain itsc.austin.ibm.com -start

If you want to know what AIX command is behind the command you issued as user padmin yo can use a special debug mode:

 $ export CLI_DEBUG=33

That's the output of the lsnports command in this mode:

 $  lsnports
 AIX: "/usr/lib/methods/viosmgr -t npiv -f query_fc_ports >/dev/null"
 name             physloc                        fabric tports aports swwpns  awwpns
 fcs0             U789C.001.DQDH231-P1-C2-T1          1     64     64   2048    2047
 fcs1             U789C.001.DQDH231-P1-C2-T2          1     64     62   2048    2043

[root@viostst1]/home/padmin# ioscli ioslevel
AIX: "cat /usr/ios/cli/ios.level "
2.2.6.41
[root@viostst1]/home/padmin# cat /usr/ios/cli/ios.level
2.2.6.41

If you are unsure of the allowable value to use to deactivate the SCSI reserve lock, use the following command to provide a list of allowable values:

# lsdev -dev hdisk6 -range reserve_policy