You can display interconnect-specific LAN virtual circuit summary data by clicking the handle at the beginning of a "LAN Virtual Circuit Summary" row to a vertical position. The screen expands to display the interconnect-specific VC summary data shown in Figure 4-6.

Figure 4-6 LAN Virtual Circuit Summary Data

Much of the data in this display corresponds to the information displayed by the SCACP command SHOW VC. The SHOW CLUSTER command does not provide a corresponding display. Which data items are displayed depends on the type of interconnect the virtual circuit is using.

Currently, this feature is available only for LAN virtual circuits. VC Summary displays for other cluster interconnects such as CI might be available in the future. When other interconnects are supported, the interconnect type will be displayed at the beginning of the line---for example, CI Virtual Circuit Summary---and the associated heading will have interconnect-specific data items.

Note that LAN Virtual Circuit counters are initialized when PEDRIVER detects the existence of a PEDRIVER on a remote system. All of a LAN VC's counters are cumulative from that time.

Some of the data described in Table 4-6 is not displayed in Figure 4-6 because the screen display is wider than shown. You can scroll to the right on your terminal screen to display the remaining fields described in the table.

Table 4-6 describes the LAN Virtual Circuit Summary data items shown in Figure 4-6.

Table 4-6 LAN Virtual Circuit Summary Data

Data		Description
VC State		Current internal state of the virtual circuit: OPEN---Virtual Circuit is open and usable. PATH---At least one open channel has been established, but the Virtual Circuit has not yet transitioned to OPEN. CLOSED---The Virtual Circuit has been closed or has become unusable.
Total Errors		Number of times the virtual circuit has been closed or has had other errors.
ReXmt Ratio		Ratio of total numbers of transmitted to retransmitted packets during the most recent data collection interval.
Channels:
	Open	Number of currently open channels available to the virtual circuit.
	ECS	Number of equivalent channel set (ECS) channels currently in use by the LAN virtual circuit.
ECS Priority		Priority a channel must have in order to be included in the Equivalent channel set (ECS). It is the highest priority any open and tight channel has.
MaxPktSiz		Maximum data buffer size in use by this LAN virtual circuit.
ReXmt TMO (µsec)		Retransmission timeout, in microseconds. The length of time the virtual circuit is currently using to wait for an acknowledgment of the receipt of a packet before retransmitting that packet.
XmtWindow:
	Cur	Current value of the transmit window (or pipe quota). Maximum number of packets that are sent before stopping to await an acknowledgment. After a timeout, the transmit window is reset to 1 to decrease congestion; it is allowed to increase as acknowledgments are received.
	Max	Maximum transmit window size currently allowed for the virtual circuit.
Xmt Options		Transmit options enabled: CKSM---packet checksumming CMPR---compression
Packets:
	Sent	Number of packets sent over this virtual circuit.
	Received	Number of packets received over this virtual circuit.
Most recent:
	Time Opened	Most recent time the virtual circuit was opened.
	Time Closed	Most recent time the virtual circuit was closed.

4.2.5 LAN Path (Channel) Summary Data

A LAN path or channel is a logical communication path between two LAN devices. Channels between nodes are determined by a local device, a remote device, and the connecting network. For example, two nodes, each having two devices, might establish four channels between the nodes. The packets that a particular LAN virtual circuit carries can be sent over any open channel connecting the two nodes.

The difference between channels and virtual circuits is that channels provide datagram service. Virtual circuits, layered on channels, provide error-free paths between nodes. Multiple channels can exist between nodes in an OpenVMS Cluster system, but only one LAN-based virtual circuit can exist between any two nodes at a time.

LAN channel counters are initialized when PEDRIVER detects the existence of a LAN device on a remote system. All of a LAN channel counters are cumulative from that time. For more information about channels and virtual circuits, see the HP OpenVMS Cluster Systems manual.

Displaying Data

You can display LAN channel summary data by clicking the handle at the beginning of a "LAN Virtual Circuit Summary Data" row (Figure 4-6), or by right-clicking a data item and choosing the Channel Summary item from the shortcut menu. The screen expands to display the LAN channel summary data shown in Figure 4-6. If there is no handle at the beginning of a "LAN Virtual Circuit Summary" data row, then managed object data collection is not enabled for this SCS node.

The data items displayed depend on the type of virtual circuit. Currently, this feature is available only for LAN virtual circuits.

Some of the data described in Table 4-7 is not displayed in Figure 4-6 because the screen display is wider than shown. You can scroll to the right on your terminal screen to display the remaining fields described in the table.

Table 4-7 LAN Path (Channel) Data

Data		Description
Devices:
	Local	Local LAN device associated with the channel.
	Remote	Remote LAN device associated with the channel.
Channel State		One of the following states: OPEN---Channel is usable. PATH---Channel handshake has been completed and, if usable, will transition to OPEN. CLOSED---Channel has been shut down or is unusable.
Total Errors		Total of various error counters for this channel (see channel details for breakdown).
ECS State		Channel ECS membership information: Y---Member N---Nonmember Losses---one of the following: T (tight)---Packet loss history is acceptable. L (lossy)---Recent history of packet losses makes channel unusable. Capacity---one of the following: P (peer)---Priority and Buffer size both match the highest corresponding values of the set of tight channels, entitling the channel to be an ECS member. I (inferior)---Priority or buffer size does not match the corresponding values of the set of tight channels. S (superior)---Priority or buffer size is better than those of the current corresponding values of the set ECS member channels. This is a short-lived, transient state because it exists only while the ECS membership criteria are being re-evaluated. U (unevaluated)---Priority or buffer size, or both, have not been evaluated against the ECS criteria, usually because the channel is lossy. Speed---one of the following: F (fast)---Channel delay is among the best for tight and peer channels. S (slow)---Channel delay makes channel too slow to be usable because it would limit the virtual circuit's average delay. Note: If a channel is lossy, its capacity and speed are not always kept current. Therefore, displayed values might be those that the channel had at the time it become lossy.
Priority:
	Cur	Current priority used to evaluate the channel for ECS membership. This is the sum of management priority values assigned to the LAN device.
	Mgmt	Dynamic management-assigned priority.
Hops		Number of switches or bridges in this channel's network path to the remote LAN device.
BufSiz		Current maximum amount of SCS data that can be contained in a packet sent over the channel. It is the smallest of the following values: Local LAN device buffer sizes Remote LAN device buffer sizes Local NISCS_MAX_PKTSZ system (SYSGEN) parameter values Remote NISCS_MAX_PKTSZ system (SYSGEN) parameter values Largest packet size determined by the NISCA Channel Packet Size probing algorithm that the intervening network can deliver
Delay (µsec)		Running average of measured round-trip time, in microseconds, for packets sent over the channel.
Load Class		Load class initialized from local and remote LAN device bit rates.
Packets:
	Sent	Number of packets sent on this channel, including control packets.
	Received	Number of packets received by this channel.
Most recent:
	Time Opened	Last time this channel had a verified usable path to a remote system.
	Time Closed	Time that this channel was last closed.

4.3 Detailed Data Accessed Through the Cluster Members Pane

The following sections describe data that appears on lines that you can open in the Cluster Members pane (Figure 4-2).

4.3.1 LAN Device Summary Data

You can display LAN device summary data by first right-clicking a node name on the Cluster Members pane. On Version 7.3 or later nodes on which managed objects are enabled, the Availability Manager displays a menu with the following choices:

• SCA Summary
• LAN Device Summary...

Click LAN Device Summary... to display the Device Summary Data page (Figure 4-7).

Figure 4-7 LAN Device Summary Data

You can right-click any data item on the page to display a menu with LAN Device Fixes... on it. These fixes are explained in Chapter 6.

Table 4-8 describes the LAN device summary data displayed in Figure 4-7. This data is also displayed with SCACP command SHOW LAN_DEVICE.

Table 4-8 LAN Device Summary Data

Data		Description
LAN Device		Name of the LAN device used for cluster communications between local and remote nodes. The icon preceding each LAN device can be one of the following colors: Black---not enabled ("Not in use by SCA") Yellow---"Run" not set Red---"Run" and anything other than Online, Local, or Restart Green---"Run" and a combination of Online, Local, and Restart only A tooltip indicates the possible states a device can be in. This can be a combination of the following: Run, Online, Local, Hello _Busy, Build_Hello, Init, Wait_Mgmt, Wait_Evnt, Broken, XChain_Disabled, Delete_pend, Restart, or Restart_Delay. Alternatively, a tooltip might display "Not in use by SCA."
Type		Type of LAN device used for the cluster.
Errors		Number of errors reported by the device since cluster communications began using it.
Management:
	Priority	Current management-assigned priority of the device.
	BufSize	Current management-assigned maximum buffer size of the device
BufSize		Smaller of interconnect specific buffer size of the device and its current management-assigned buffer size.
Messages:
	Sent	Number of LAN packets sent by the device.
	Received	Number of packets received from remote LAN device.

4.3.2 LAN Device Detail Data

To display LAN device detail data, right-click a LAN Path (Channel) Summary data item on the LAN Virtual Circuit Summary data page (Figure 4-6). The Availability Manager then displays the shortcut menu shown in Figure 4-8.

Figure 4-8 LAN Path (Channel) Details Menu

To display device details, select the LAN Device Details... item on the menu. After a brief delay, a LAN Device Overview Data page (Figure 4-9) is displayed.

A series of tabs at the top of the LAN Device Overview Data page indicate additional LAN device pages that you can display. Much of the LAN device detail data corresponds to data displayed by the SCACP command SHOW LAN_DEVICE.

4.3.2.1 LAN Device Overview Data

The LAN Device Overview Data page (Figure 4-9 displays LAN device summary data.

Figure 4-9 LAN Device Overview Data

Table 4-9 describes the data displayed in Figure 4-9.

Table 4-9 LAN Device Overview Data

Data	Description
Status	Device status: Run, Online, Local, Hello _Busy, Build_Hello, Init, Wait_Mgmt, Wait_Evnt, Broken, XChain_Disabled, Delete_pend, Restart, or Restart_Delay. Alternatively, "Not in use by SCA" can be displayed.
Device Name	Name of the LAN device.
Device Type	OpenVMS device type value.
Total Errors	Total number of errors listed on the Errors page.
Priority	Dynamic management-assigned priority.
Max Buffer Size	Maximum data buffer size for this LAN device.
Mgmt Buffer Size	Dynamic management-assigned maximum block data field size.
Load Class	Load class. The rate in MBs currently being reported by the LAN device.
Receive Ring Size	Number of packets the LAN device can buffer before it discards incoming packets.
Default LAN Address	LAN device's hardware LAN address.
Current LAN Address	Current LAN address being used by this LAN device.

4.3.2.2 LAN Device Transmit Data

The LAN Device Transmit Data page (Figure 4-10) displays LAN device transmit data.

Figure 4-10 LAN Device Transmit Data

Table 4-10 describes the data displayed in Figure 4-10.

Table 4-10 LAN Device Transmit Data

Data	Description
Messages Sent	Number of packets sent by this bus, including multicast "Hello" packets.
Bytes Sent	Number of bytes in packets sent by this LAN device, including multicast "Hello" packets.
Multicast Msgs Sent	Number of multicast "Hello" packets sent by this LAN device.
Multicast Bytes Sent	Number of multicast bytes in "Hello" packets sent by this LAN device.
Outstanding I/O Count	Number of transmit requests being processed by LAN driver.

4.3.2.3 LAN Device Receive Data

The LAN Device Receive Data page (Figure 4-11) displays LAN device receive data.

Figure 4-11 LAN Device Receive Data

Table 4-11 describes the data displayed in Figure 4-11.

Table 4-11 LAN Device Receive Data

Data	Description
Messages Rcvd	Number of packets received by this LAN device, including multicast packets.
Bytes Received	Number of bytes in packets received by this LAN device, including multicast packets.
Multicast Msgs Rcvd	Number of multicast NISCA packets received by this LAN device.
Multicast Bytes Rcvd	Number of multicast bytes received by this LAN device.

4.3.2.4 LAN Device Events Data

The LAN Device Events Data page (Figure 4-12) displays LAN device events data.

Figure 4-12 LAN Device Events Data

Table 4-12 describes the data displayed in Figure 4-12.

Table 4-12 LAN Device Events Data

Data	Description
Port Usable	Number of times the LAN device became usable.
Port Unusable	Number of times the LAN device became unusable.
Address Change	Number of times the LAN device's LAN address changed.
Restart Failures	Number of times the LAN device failed to restart.
Last Event	Event type of the last LAN device event (for example, LAN address change, an error, and so on).
Time of Last Event	Time the last event occurred.