Volume selection preference attributes

Table 1 shows some of the preference attributes used in volume selection for allocation of a data set.

Table 1. Volume Selection Preference Attributes
Criteria	Preferences
PCU SEPARATION	Volume does not reside in the same physical control unit that has allocated a data set from which this data set should be separated, as specified in the data set separation profile.
EXTENT POOL SEPARATION	Volume does not reside in the same extent pool that has allocated a data set from which this data set should be separated, as specified in the data set separation profile.
VOLUME SEPARATION	Volume does not contain a data set from which this data set should be separated, as specified in the data set separation profile.
VOLUME COUNT	Volume resides in a storage group that has enough eligible volumes to satisfy the requested VOLUME COUNT.
PRIMARY THRESHOLD	Volume has sufficient space in the target addressing space for the allocation amount without exceeding the storage group HIGH THRESHOLD value.
SECONDARY THRESHOLD	Volume has sufficient space for the allocation amount without exceeding the storage group HIGH THRESHOLD value.
SMS STATUS	Volume and its associated storage group SMS status are ENABLED.
MULTI-TIERED STORAGE GROUP	Volume resides in a storage group that will be selected in the order of specification.
END-OF-VOLUME EXTEND	This is an end-of-volume extend, where an extend storage group is specified, and the volume does not reside in the specified extend storage group.
NONOVERFLOW	Volume resides in a nonoverflow storage group.
IART	Volume is mountable, and an IART value greater than zero was specified in the storage class.
FAST REPLICATION	Volume is eligible for a fast replication request.
CLUSTER	Volume resides in the same cluster.
EXTENT POOL	Volume resides in a different extent pool (for striping).s
CONTROLLER	Volume resides on a device connected to a different logical control unit (LCU) (for striping).
EXTENDED ATTRIBUTE	Volume has extended attributes (format 8 and 9 DSCBs) or optionally resides in extended addressing space.
ACCESSIBILITY	Volume resides in a control unit that supports ACCESSIBILITY, and the storage class ACCESSIBILITY value is PREFERRED.
ACCESSIBILITY	Volume resides in a control unit that does not support ACCESSIBILITY, and the storage class ACCESSIBILITY value is STANDARD.
PARALLEL ACCESS VOLUME	Volume supports the PAV specification in the storage class
AVAILABILITY	Volume resides in a control unit that supports AVAILABILITY and the storage class AVAILABILITY value is PREFERRED.
AVAILABILITY	Volume resides in a control unit that does not support AVAILABILITY and the storage class AVAILABILITY value is STANDARD.
EXTENDED FORMAT	Volume resides in a control unit that supports EXTENDED FORMAT and the data class IF EXT value is PREFERRED.
MILLESECOND RESPONSE (MSR)	Volume provides the requested response time that is specified or defaulted in the storage class DIRECT MSR or SEQUENTIAL MSR.
MILLESECOND RESPONSE (MSR)	Volume provides a faster response time than what is specified or defaulted in the storage class DIRECT MSR or SEQUENTIAL MSR.

The volume selection preference attributes in Table 1 are assigned a weight in the order shown (highest to lowest). SMS selects the volume with the highest cumulative preference weight.