The method for establishing the primary ownership of a disk device group is based on the setting of an ownership preference attribute called preferenced. If the attribute is not set, the primary owner of an otherwise unowned disk device group is the first node that attempts to access a disk in that group. However, if this attribute is set, you must specify the preferred order in which nodes attempt to establish ownership.
If you disable the preferenced attribute, then the failback attribute is also automatically disabled. However, if you attempt to enable or re-enable the preferenced attribute, you have the choice of enabling or disabling the failback attribute.
If the preferenced attribute is either enabled or re-enabled, you are required to re-establish the order of nodes in the primary ownership preference list.
This procedure uses scsetup(1M) to set or unset the preferenced attribute and the failback attribute for Solstice DiskSuite/Solaris Volume Manager or VxVM disk device groups.
To run this procedure, you need the name of the disk device group for which you are changing attribute values.
Become superuser on any node of the cluster.
Run the scsetup command.
The Main Menu is displayed.
To work with disk device groups, type 4 (Device groups and volumes).
The Device Groups Menu is displayed.
To change key properties of a device group, type 6 (Change key properties of a VxVM or Solstice DiskSuite/Solaris Volume Manager device group).
The Change Key Properties Menu is displayed
To change a device group property, type 1 (Change the preferenced and/or failback properties).
Follow the instructions to set the preferenced and failback options for a device group.
Verify that the disk device group attributes have been changed.
Look for the device group information displayed by the following command.
# scconf -p
The following example shows the scconf command generated by scsetup when it sets the attribute values for a disk device group (dg-schost-1).
# scconf -c -Dname=dg-schost-1,nodelist=phys-schost-1:phys-schost-2, \ preferenced=true,failback=enabled,numsecondaries=1 # scconf -p | grep Device Device group name: dg-schost-1 Device group type: SDS Device group failback enabled: yes Device group node list: phys-schost-1, phys-schost-2 Device group ordered node list: yes Device group desired number of secondaries: 1 Device group diskset name: dg-schost-1