How to mapping a disk from vio server to lpar in aix?
Note: The below
procedure is to assume that we need to add a new virutal disk to the root
volume group on the lpar, for that we need to map a new disk from vio server to
the lpar.
Hence as a aix
admin i need to map a new disk from vio server to the lpar like below. There
are several methods to accomplish this task. The below procedure is one of
them.
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Find out the slot number of the vscsi
#lspv -> To
check the disk present on the lpar
hdisk0
0006a7df4403b4a6
rootvg
active
# lspath -F "name,status,parent,connection" -l
hdisk0
hdisk0,Enabled,vscsi0,810000000000
hdisk0,Enabled,vscsi1,810000000000
# lscfg -l
vscsi0
vscsi0 U9111.520.0000034-V10-C50-T1 Virtual SCSI Client Adapter
# lscfg -l
vscsi1
vscsi1 U9111.520.0000034-V10-C51-T1 Virtual SCSI Client Adapter
U9111.520.0000034
-> model and serial number
V10 -> lpar id
C50 and C51 is
client slot number of the vhost adapter
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Find out the VIO server associated with the lpar using HMC
# lsrsrc
IBM.ManagementServer or lsrsrc IBM.MCP
------ login to the
hmc with the hscroot password
The below command
is used to find out the vio server name and vhost info associated with the lpar
# lshwres -r
virtualio --rsubtype scsi -m U9111-520-0000034 --filter lpar_ids=10 -F
"slot_num,remote_slot_num,remote_lpar_name"
Note: we can
replace “-m U9111-520-0001234” with the name of your managed system
50,50,vio_server1
51,51,vio_server2
The above output
shows the client slot number, server slot number, and VIO server name.
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Find out the vhost assigned for the lpar
we can find the
vhost info using the slot number
#lsdev -slots|grep
-i c50
output: vhost10
So the vhost10 is
associated with our target lpar.
#lsmap -vadapter
vhost10
SVSA
Physloc
Client Partition ID
---------------
-------------------------------------------- ------------------
vhost10
U9111.520.0000034-V2-C50 0x0000000a
VTD
indprodfin_rootvg
Status
Available
LUN
0x8100000000000000
Backing
device hdisk43
Physloc
L5000000000000
the slot number is
the “C50” part of the U9111.520.0000034-V2-C50. So we got the correct
vhost. (we can also confirm the 0x0000000a is the hexa decimal value of
the lpar id 10.
and the pvid of the
backing device is same as the pvid of the disk on the lpar.)
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Find out the free disk /unassigned disk on the vios which
needs to be mapped.
$lspv -free
The above output
will show the list of free disk which are available on the vio server and not
mapped with any vhost. or if we already talked with storage team and they
provide the lun details then we can get the disk like below.
odmget CuAt|grep -i
4386 -> The command will list out the hdisk name.
we will take hdisk20 as a free disk for instance.
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Changing the attributes (reserve_policy and health check ) of
the disk before mapping.
As we have a
dual vio set up, we need to change the reserve policy as no_reserve. Hence the
disk is not hold by any of the vio server.
chdev -dev hdisk20
-attr reserve_policy=no_reserve
chdev -dev hdisk0
-attr hcheck_interval=60
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Mapping the disk to
the vhost
syntax: mkvdev -vdev <hdisk>
-vadapter <vhost> -dev <VTD name>
mkvdev -vdev
hdisk20 -vadapter vhost10 -dev indprodfin_rootvg
lsmap -vadapter
vhost10
SVSA
Physloc
Client Partition ID
--------------- --------------------------------------------
------------------
vhost10
U9111.520.0000034-V2-C50
0x0000000a
VTD
indprodfin_rootvg
Status
Available
LUN
0x8100000000000000
Backing
device hdisk43
Physloc
L5000000000000
VTD
indprodfin_rootvg1
Status
Available
LUN
0x8200000000000000
Backing
device hdisk47
Physloc
L3000000000000
We confirm that the
disk has been mapped successfully.
Now come to lpar
and scan the new disk.
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Scanning the newly
assigned disk on the lpar
#lspv
hdisk0
0006a7df4403b4a6
rootvg
active
#cfgmgr
--> scanning the server
#lspv
hdisk0
0006a7df4403b4a6
rootvg
active
hdisk1
0006a7dfd9f11858
none
------------we got
the newly added disk hdisk1
#lspath -l hdisk1
hdisk1,Enabled
hdisk1,Enabled
------------------------
confirmed that hdisk1 has a dual path.
# chdev -l hdisk1
-a hcheck_interval=20
#extendvg rootvg
hdisk1
#lspv
hdisk0
0006a7df4403b4a6
rootvg
active
hdisk1
0006a7dfd9f11858
rootvg
active
