Settings for VIOS and LPARs to allow partition mobility. It's important to set the ODM parameter to allow NPIV, else no mobility. I change all these settings because it was locking all new devices and prevent them to be available.

Check the settings:

[root@vios1]:/home/padmin# /usr/DynamicLinkManager/bin/dlnkmgr view -sys; echo $?
[root@vios1]:/home/padmin# /usr/DynamicLinkManager/bin/dlmodmset -o

Change to best practice:

[root@vios1]:/home/padmin# /usr/DynamicLinkManager/bin/dlnkmgr set -dpc on -s
[root@vios1]:/home/padmin# /usr/DynamicLinkManager/bin/dlnkmgr set -iem on -s
[root@vios1]:/home/padmin# /usr/DynamicLinkManager/bin/dlnkmgr set -afb on -intvl 15 -s
[root@vios1]:/home/padmin# /usr/DynamicLinkManager/bin/dlnkmgr set -pchk on -intvl 15 -s
[root@vios1]:/home/padmin# /usr/DynamicLinkManager/bin/dlmodmset -v on -s

Change also default disk settings reserve_policy (to prevent a lock!, default is PR_exclusive)and queue_depth on VIOS for Hitachi:

[root@vios1]:/home/padmin# odmget -q uniquetype="disk/fcp/Hitachi" PdAt | grep -p "reserve_policy|queue_depth"

To change it's now easy with chdef command:

[root@vios1]:/home/padmin# chdef -a reserve_policy=no_reserve -c disk -s fcp -t Hitachi
[root@vios1]:/home/padmin# chdef -a queue_depth=20 -c disk -s fcp -t Hitachi

Then Reboot

Do it also on all LPARs

When you restore an mksysb from a partition that has HDLM installed, then Rebuild the HDLM devices, else your driver will be in a bad state:

[root@vios1]:/home/padmin# /usr/DynamicLinkManager/bin/dlnkmgr view -sys; echo $?

This will give you a non 0 value, or dead state…

Then disable all Hitachi devices, if using it on VIOS, then unmap Hitachi disks, and put then in defined:

for disk in $(lsdev -Cc | grep Hitachi | awk '{print $1}')
do
rmdev -l $disk
done

If boot on Hitachi disks, then the following command will reboot the LPAR or VIOS:

[root@vios1]:/home/padmin# /usr/DynamicLinkManager/bin/dlmpostrestore

It will recreate the /dev/dlmadrv, /dev/rdlmcldrv, /dev/rdlmfdrvio

And reboot, then apply the Best practice parameters, and reboot again