# LCU Control Unit

This group of attributes monitors I/O requests for a control unit that are related to the HyperPAV (Hyper parallel access volume) feature.

Control Unit: The physical control unit number.

HyperPAV Requests: The total number of HyperPAV I/O requests for the control unit.

I/Os Queued Alias Unavailable: The number of times an I/O could not start for the control unit because no HyperPAV aliases were available.

LCU Number: The HCD-assigned number for this logical control unit. An LCU is a logical representation of either a single control unit, with or without attached devices, or a group of control units that share devices.

Managed System: An internal node name used to identify the system from which this row of data was obtained.

Maximum HyperPAV Aliases Used: The maximum number of HyperPAV aliases in use concurrently.

Maximum HyperPAV Volume Aliases: The maximum number of HyperPAV aliases in use concurrently by a single logical volume.

Maximum I/Os Queued: The maximum number of I/Os concurrently queued for the control unit.

Percent I/Os Queued Alias Unavailable: The percent of I/Os that could not start for the control unit because no HyperPAV aliases were available.

Time Stamp: Date and time this data was reported. Primarily for use in historical reporting.