HP-UX vPars and Integrity VM V6.3 Administrator Guide

# kctune mdep_reduce_rse_size=1

After enabling the tunable, the VSP must be restarted for the tunable to take effect.

2. VSP running on Itanium 9300 processor

a. Installation requirements for VSP

• HP-UX 11i v3 March 2014 (AR1403) OE

• HP-UX 11i v3 March 2013 (AR1303) OE

• HP-UX 11i v3 September 2012 (AR1209) OE with AR1303 Feature11i patches

b. vPars and Integrity VM V6.3 or vPars and Integrity VM V6.2 with PHSS_43648 (PK2)

WARNING! This feature must not be attempted on any other VSP configurations other than

those listed.

3. Integrity VM configuration

Enable the hpvm tunable ogm_tukwila_poulson. To set the tunable, enter the following

hpvmmodify -p <guest_id> -x ogm_tukwila_poulson=enabled command on

the desired guest. You must enable this tunable before starting the guest. If the tunable is

enabled on a live guest, the change will be updated in the guest configuration; however, it

will take effect only on the guest next reboot.

NOTE: After an inter family Online guest migration from Itanium 9300 to Itanium 9500 systems,

the following limitations must be taken care:

1. The caliper(1) command can fail or show incorrect data on the Itanium 9500 systems.

Hence, HP recommends not to run the caliper command in the VM guest after guest

migration.

2. The machinfo(1) command shows the source guest data. Upto vPars and Integrity VM V6.2,

online guest migration was only supported among same family processors. With this feature,

as online guest migration is being supported across processor family, running the machinfo

command on the Itanium 9500 system after migration still displays it as an Itanium 9300

system.

3. After enabling ogm_tukwila_poulson tunable, if the guest is offline migrated to a VSP

with vPars and Integrity VM version lower than 6.2 PK2 or the VSP is downgraded to a lower

version, you can use the hpvmmodify -P <Guest name> -x tunables=otpe=default

command to unset the tunable. This command removes the ogm_tukwila_poulson tunable

entry from the configuration file. An attempt to perform Itanium 9300 systems to Itanium 9500

systems to Poulson online guest migration from V6.2 base or V6.2 PK1 to V6.3 with the tunable

entry in the guest configuration may result in the guest panic or online guest migration to abort.

With the above VSP and VM guest configurations, a VM guest can be migrated online from Itanium

9500 system to Itanium 9300 system as well.

216 Migrating VMs and vPars