HP XP Cluster Extension Software Administrator Guide

3. Open the ucf.cfg and make the following entries:
#Sample 3DC configuration
# package/service/cluster group
test_application/CLX resource name
APPLICATION CLX_RESOURCE_NAME
# Enable 3DC : yes|noEnable3DC yes
# Raid manager device group between DC1 and DC3DC1-DC3DeviceGroup DG13
# Raid manager device group between DC2 and DC3DC2-DC3DeviceGroup DG23
# Raid manager mirror unit number used for device group
between DC1 and DC2
DC1-DC2MUNumber 0
# Raid manager mirror unit number used for device group
between DC1 and DC3
DC1-DC3MUNumber 1
# Raid manager mirror unit number used for device group
between DC2 and DC3
DC2-DC3MUNumber 2
# 3DC configuration preference. 0 : Multi-Target , 1 : Multi-Hop, 2:
Multi-Target with better CLX resource online time.
3DCSyncPreference 0
# The number of seconds CLXRUN should wait to initiate the data resync
to third data center.
#3DCResynWaitTimeout
Where,
Application: Name of the CLX resource name for which 3DC needs to be enabled.
Enable3DC: If the value is yes then 3DC will be enabled for this application, otherwise 3DC
operation will be disabled.
DC1-DC3DeviceGroup: Name of the RAID manager CAJ device group between the primary
and the secondary data center.
DC2-DC3DeviceGroup: Name of the RAID manager CAJ device group between the secondary
and the remote data center.
DC1-DC2MUNumber: RAID manager mirror unit number used for the CA-Sync
DC1-DC2DeviceGroup.
DC1-DC3MUNumber: RAID manager mirror unit number used for the CAJ
DC1-DC3DeviceGroup.
DC2-DC3MUNumber: RAID manager mirror unit number used for the CAJ
DC2-DC3DeviceGroup.
3DCSyncPreference: This flag allows you to set your preferred 3DC configuration on
application failover.
If 3DCSyncPreference is set to 1, multi-hop configuration is given preference. But after
application failover, if multi-target configuration is maintained, then this configuration is not
changed to multi hop configuration even though the 3DCSyncPreference is set to 1.
If 3DCSyncPreference is set to 2, multi-target configuration is given preference. This option
is preferred instead of 0. However, if full resync is initiated to the third datacenter during
application movement across the data centers, then 3DCSyncPreference value must be
selected as 0.
If 3DCSyncPreference is set to 0, multi-target configuration is given preference. If you select
this option, ensure that Pending timeout (For the CLX resource in MSFC) is greater than
or equal to 180 seconds.
If 3DCSyncPreference parameter is not configured, CLX assigns 0 as the default value.
If CLX is unable to keep the preferred configuration due to reasons such as CA link failure
and so on, it shifts to the non preferred configuration.
78 Advanced HP XP Cluster Extension configuration