Veritas Storage Foundation Intelligent Storage Provisioning 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

149Using capabilities, templates and rules
Storage selection rules
multipath
A multipath rule specifies how tolerant a VxVM object is to the failure of a
number of specified components. The rule defines how many paths a VxVM
object should have available through each component.
Note: The multipath rule does not take any rule operators.
The following examples demonstrate the application of multipath rules:
■ Tolerate the failure of one controller:
multipath 2 "Controller"
■ Tolerate the failure of one controller and one switch:
multipath 2 "Controller", 2 "Switch"
select
A select rule specifies which storage to use for creating VxVM objects. When
used outside of a sub clause, this rule is applied to an entire volume.
Note: Expressions involving select can use the allof, anyof, eachof, noneof
and
oneof operators to combine multiple arguments. By default, ISP applies the
anyof operator.
See “Storage selection rule operators” on page 151.
The following examples demonstrate the application of select rules:
■ The following rules, which try to allocate LUNs first from Room1, then from
Room2 if unsuccessful, and then from both locations, are equivalent:
select "Room"="Room1", "Room"="Room2"
select anyof("Room"="Room1", "Room"="Room2")
Note: When the anyof operator is used, ISP takes storage from the
operands in the order that they are specified.
■ Use only EMC LUNs from Room1:
select eachof("VendorName"="EMC", "Room"="Room1")
Note: Here the eachof operator is used rather than the allof operator.
The eachof operator implies the logical intersection of its operands. The
allof operator implies the logical union of its operands.