Data Link Control (DLC) Read and Write Queue Statistics workspace
The Data Link Control (DLC) Read and Write Queue Statistics workspace
analyzes input at the Data Link Control (DLC) layer level providing
z/OS Communications Server tuning statistics for the following types
of interfaces on a z/OS v1.12 or later system:
- HiperSockets
- Queued direct I/O (QDIO) OSA features
Some OSA-Express features support up to eight read queues while
HiperSockets supports only a single read queue. Data is provided for
each read queue associated with the supported device or interface.
There is one row of data returned for each of the one to four possible
write priority queues that are supported for the datapath device number
(data subchannel address) for each interface. When interfaces share
a datapath device number (data subchannel address), the statistics
for each interface sharing the datapath device will be identical.
Note: This workspace returns data only on
systems running on z/OS v1.12 or later
This workspace can be displayed by clicking on the Link icon in
the Interface Statistics Summary table in the
Interface Statistics workspace or the Interface Status
Summary table in the Interface Status workspace and selecting Data Link Control (DLC) Read and Write Queue Statistics from
the list of available links. The link to this workspace is a conditional
link and is displayed in the list of available links only if the value
of the Interface Type attribute in the Interface
Status workspace is one of the following types:
- 2 = OSA_QDIO_ethernet_OSD
- 3 = OSA_QDIO_ethernet_OSM. This is the intranode management network
(INMN), a private 1000BASE-T Ethernet network operating at 1 Gbps
that is required for the Unified Resource Manager to manage the resources
within a single zEnterprise(TM) node. The INMN connects the Support
Element (SE) to the z196 and to any attached zBX. This interface is
associated with the zEnterprise(TM) mainframe server.
- 4 = OSA_QDIO_ethernet_OSX. This is the private 10 Gigabit Ethernet
network for application data communications within an ensemble. Data
communications for workloads can flow over the IEDN within and between
nodes of an ensemble. All of the physical and logical resources of
the IEDN are configured, provisioned, and managed by the Unified Resource
Manager. This interface is associated with the zEnterprise(TM) mainframe
server.
- 5 = Hipersocket
The Data Link Control (DLC) Read and Write Queue Statistics workspace
provides the following views:
- Bytes Received per Queue Workload Name:
Displays the number of Received Bytes per Queue Workload Name for
the current collection. The y-axis is the count of bytes. The x-axis
includes between one and eight bars denoting the number of Received
Bytes for each of the read queues defined for the current collection
interval. This information is presented in a bar chart where:
- Yellow represents Received Bytes.
- Bytes Transmitted per Queue Priority: Displays
the number of Transmitted Bytes per Queue Priority for the current
collection. The y-axis is the count of bytes. The x-axis includes
between one and four bars denoting the number of Transmitted Bytes
for each of the write queues defined for the current collection interval.
This information is presented in a bar chart where:
- Yellow represents Transmitted Bytes.
- QDIO Accelerator Bytes Received per Queue Workload
Name: Displays the number of received bytes from each read queue
that was subsequently routed outbound using queued direct I/O (QDIO)
routing or the QDIO Accelerator for the current collection. The y-axis
is the count of bytes. The x-axis includes between one and four bars
denoting the number of received bytes for each of the read queues
defined that was subsequently routed for the current collection interval.
This information is presented in a bar chart where:
- Yellow represents Accelerated Bytes.
- QDIO Accelerator Bytes Transmitted per Queue
Priority: Displays the number of transmitted bytes that were
routed outbound using queued direct I/O (QDIO) routing or the QDIO
Accelerator per Queue Priority for the current collection. The y-axis
is the count of bytes. The x-axis includes between one and four bars
denoting the number of Routed QDIO Transmitted Bytes for each of the
write queues defined for the current collection interval. This information
is presented in a bar chart where:
- Yellow represents Accelerated Bytes.
- Data Link Control (DLC) Read Queue Statistics Summary table: Analyzes
input at the Data Link Control (DLC) layer level providing z/OS Communications
Server tuning statistics for HiperSockets and queued direct I/O (QDIO)
OSA features. Some OSA-Express features support up to eight read
queues while HiperSockets supports only a single read queue. Data
is provided for each read queue associated with the supported device
or interface. This data is available only on a z/OS v1.12 or later
system.
- Data Link Control (DLC) Write Queue Statistics Summary table:
Displays output at the Data Link Control (DLC) layer level, providing
information related to the datapath device number associated with
the selected interface. Data is returned for each active OSA-Express
queued direct I/O (QDIO) or HiperSocket datapath device number (data
subchannel address). One row of data is returned for each of the one
to four possible write priority queues that are supported for the
datapath device number (data subchannel address) for each interface.
Data Link Control (DLC) Read Queue Statistics Summary table
The Data Link Control (DLC) Read Queue Statistics Summary table
analyzes input at the Data Link Control (DLC) layer level providing
z/OS Communications Server tuning statistics for the following types
of interfaces on a z/OS v1.12 or later system:
- HiperSockets
- Queued direct I/O (QDIO) OSA features
Some OSA-Express features support up to eight read queues while
HiperSockets supports only a single read queue. Data is provided
for each read queue associated with the supported device or interface.
For a complete list of the attributes available in the Data Link
Control (DLC) Read Queue Statistics Summary table, and a brief description
of each, see the KN3 Interface Read Queue Attributes help panel.
See also:
Data Link Control (DLC) Write Queue Statistics Summary table
The Data Link Control (DLC) Write Queue Statistics Summary table
displays output at the Data Link Control (DLC) layer level, providing
information related to the datapath device number associated with
the selected interface. Data is returned for each active OSA-Express
queued direct I/O (QDIO) or HiperSocket datapath device number (data
subchannel address). One row of data is returned for each of the one
to four possible write priority queues that are supported for the
datapath device number (data subchannel address) for each interface.
For a complete list of the attributes available in the Data Link
Control (DLC) Write Queue Statistics Summary table, and a brief description
of each, see the KN3 Interface Write Queue Attributes help panel.
See also: