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A Solaris Volume Manager disk device group is defined by a name, the
nodes upon which this group can be accessed, a global list of devices in the
diskset, and a set of properties used to control actions such as potential
primary preference and failback behavior.
For Solaris Volume Manager disk device groups, only one diskset may
be assigned to a disk device group, and the group name must always match the
name of the diskset itself.
Solaris Volume Manager has the concept of a multihosted or shared diskset,
which is a grouping of two or more hosts and disk drives which are accessible
by all hosts and have the same device names on all hosts. This identical device
naming requirement is achieved by using the raw disk devices to form the diskset.
The Disk ID pseudo driver (DID) allows multihosted disks
to have consistent names across the cluster. Only hosts already configured
as part of a diskset itself can be configured into the nodelist
of a Solaris Volume Manager device group. At the time drives are added to
a shared diskset, they must not belong to any other shared diskset.
The Solaris Volume Manager metaset(1m) command creates the diskset, which also
initially creates and registers it as a Solaris Volume Manager device group.
Next, you must use the scconf(1M) command
to set the node preference list, the preferenced, failback and numsecondaries suboptions.
If you want to change the order of node preference list or the failback
mode, you must specify all the nodes that currenly exist in the device group
in the nodelist. In addition, if you are changing the the
order of node preference, you must also set the preferenced
suboption to true.
If the preferenced suboption is not specified with
the "change", the already established true or false setting is used.
The scconf command cannot be used to remove the Solaris
Volume Manager device group from the cluster configuration, the Solaris Volume
Manager metaset command is used to do this. You remove
a disk device group by removing the Solaris Volume Manager diskset.
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