Document revision date: 15 July 2002

Systems running versions prior to Version 2.0 Availability Manager software collect and display information about LAN VC channel selection, but this information does not include managed objects, which were implemented beginning with Version 2.0 (Refer to the introduction to this chapter for more information about managed objects.)

Figure 4-12 is an example of a pre-Version 2.0 LAN VC Channel Selection Data page.

Figure 4-12 LAN VC Channel Selection Data Page (Pre-Version 2.0)

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

Table 4-12 LAN VC Channel Selection Data (Pre-Version 2.0)

Data	Description
Buffer Size	Maximum data buffer size for this virtual circuit.
Channel Count	Number of channels available for use by this virtual circuit.
Channel Selections	Number of channel selections performed.
Protocol	NISCA protocol version.
Local Device	Name of the local LAN device that the channel uses to send and receive packets.
Local LAN Address	Address of the local LAN device that performs sends and receives.
Remote Device	Name of the remote LAN device that the channel uses to send and receive packets.
Remote LAN Address	Address of the remote LAN device performing the sends and receives.

4.3.2.5 LAN VC Channel Selection Data (Version 2.0 and Later)

Systems running Availability Manager Version 2.0 or later collect and display the following information about LAN VC Channel Selection. This information includes managed objects, which were implemented beginning with Version 2.0 (Refer to the introduction to this chapter for more information about managed objects.)

Figure 4-13 is an example of a Channel Selection Data page on a Version 2.0 or later system.

Figure 4-13 LAN VC Channel Selection Data Page (Version 2.0 and Later)

Table 4-13 describes the data displayed in Figure 4-13.

Table 4-13 Channel Selection Data (Version 2.0 and Later)

Data	Description
ECS Priority	Current minimum priority a tight channel must have in order to be an ECS member.
Buffer Size	Maximum data buffer size for this virtual circuit. A channel must have this buffer size in order to be an ECS member.
Hops	Current minimum management hops a channel must have in order to be included in the ECS.
Channel Count	Number of channels currently available for use by this virtual circuit.
Channel Selections	Number of channel selections performed.
Protocol	Remote node's NISCA protocol version.
Speed Demote Threshold	Current threshold for reclassifying a FAST channel to SLOW.
Speed Promote Threshold	Current threshold for reclassifying a SLOW channel to FAST.
Min RTT	Current minimum average delay of any current ECS members.
Min RTT Threshold	Current threshold for reclassifying a channel as FASTER than the current set of ECS channels.

4.3.2.6 LAN VC Closures Data

LAN VC closures data is information about the number of times a virtual circuit has closed for a particular reason. Figure 4-14 is an example of a LAN VC Closures Data page.

Figure 4-14 LAN VC Closures Data Page

Table 4-14 describes the data displayed in Figure 4-14.

Table 4-14 LAN VC Closures Data

Data	Description
No Path	Number of times the virtual circuit was closed because no usable LAN path was available. N/A on systems prior to Version 2.0.
SeqPkt TMO	Number of times the VC was closed because a sequenced packet's retransmit timeout count limit was exceeded.
Topology Change	Number of times the VC was closed because PEdriver performed a failover from a LAN path (or paths) with a large packet size to a LAN path with a smaller packet size.
CC DFQ Empty	Number of times the VC was closed because the channel control data-free queue (DFQ) was empty.
LAN XmtTMO	Number of times the VC was closed because a sequenced packet was not transmitted by the LAN device within an acceptable amount of time.
NPAGEDYN Low	Number of times the virtual circuit was lost because of a nonpaged pool allocation failure in the local node.

4.3.2.7 LAN VC Packets Discarded Data

LAN VC packets discarded data is information about the number of times packets were discarded for a particular reason. Figure 4-15 is an example of a LAN VC Packets Discarded Data page.

Figure 4-15 LAN VC Packets Discarded Data Page

Table 4-15 describes the data displayed in Figure 4-15.

Table 4-15 LAN VC Packets Discarded Data

Data	Description
Bad Checksum	Number of times there was a checksum failure on a received packet.
No Xmt Chan	Number of times no transmit channel was available.
Rcv Short Pkt	Number of times an undersized transport packet was received.
Ill Seq Pkt	Number of times an out-of-range sequence numbered packet was received.
TR DFQ Empty	Number of times the transmit data-free queue (DFQ) was empty.
TR MFQ Empty	Number of times the TR layer message-free queue (MFQ) was empty.
CC MFQ Empty	Number of times the channel control MFQ was empty.
Rcv Window Miss	Number of packets that could not be placed in the virtual circuit's receive cache because the cache was full.

4.3.3 LAN Channel Details Data

To display LAN channel details data, right-click a LAN channel summary data item on the Cluster Summary page (Figure 4-7). The Availability Manager displays a popup menu with the following options:

• Channel Details...
• Adapter Details...
• Fixes...

To display LAN channel details, select the Channel Details... item on the menu. After a brief delay, a LAN Channel Overview Data Page, shown in Figure 4-16, is displayed. A series of tabs at the top of the Overview Data Page indicate additional channel pages you can display.

4.3.3.1 LAN Channel Overview Data Page

The LAN Channel Overview Data page, shown in Figure 4-16, displays general channel data.

Figure 4-16 LAN Channel Overview Data Page

Table 4-16 describes the data displayed in Figure 4-16.

Table 4-16 LAN Channel Overview Data

Data	Description
State	Channel's current state: OPEN, PATH, or CLOSED.
Status	Channel status.
Total Errors	Sum of channel's error counters.
Time Opened	Last time that this channel had a path to a remote system.
Time Closed	Last time that this channel was closed.
Total Time Open	Total time that this channel has been open.
Device Name	Local LAN device name.
Device Type	Local LAN device type.
Average RTT	Average of measured round-trip time.
RSVP Threshold	Number of packets before requesting that the remote node immediately return an acknowledgment.
Remote Ring Size	Number of entries in the remote LAN device.
Remote Device Type	Remote LAN device type.
Remote T/R Cache	Number of out-of-order packets that the remote transmit/receive resequencing cache can buffer.
LAN H/W Address	LAN device's hardware address.

4.3.3.2 LAN Channel Counters Data Page

The LAN Channel Counters Data page, shown in Figure 4-17, displays path counters data.

Figure 4-17 LAN Channel Counters Data Page

Table 4-17 describes the data displayed in Figure 4-17.

Table 4-17 LAN Channel Counters Data

Data	Description
ECS Transitions	Number of times this channel has been in and out of the equivalent channel set (ECS).
Messages Sent	Number of packets sent over this channel, including control packets.
Bytes Sent	Number of bytes transmitted on this channel, including control packets.
Control Messages Sent	Number of control packets sent, not including multicast packets.
Control Msg Bytes Sent	Number of control packet bytes sent, not including multicast packets.
Messages Received	Number of packets received by this channel.
Bytes Received	Number of bytes in packets received by this channel.
MC Control Messages Rcvd	Number of multicast control packets received.
MC Control Msg Bytes Rcvd	Number of multicast control packets bytes received.
Control Messages Rcvd	Number of control packets received.
Control Msg Bytes Rcvd	Number of control packet bytes received.

4.3.3.3 LAN Channel Errors Data Page

The LAN Channel Errors Data page, shown in Figure 4-18, displays LAN channel errors data.

Figure 4-18 LAN Channel Errors Data Page

Table 4-18 describes the data displayed in Figure 4-18.

Table 4-18 LAN Channel Errors Data

Data	Description
Seq Retransmit	Number of times a sequenced VC packet sent on this channel was retransmitted, and the channel was penalized for the lost packet.
LAN Transmit Failures	Number of times the local LAN device reported a failure to transmit a packet, and channel was penalized for the lost packet.
Restart Channel	Close/restart because of channel control packet was received indicating the other end closed the channel and is restarting the channel handshake.
Channel Init Timeouts	Channel initialization handshake timeout.
Listen Timeouts	No packets of any kind, including HELLOs, were received in LISTEN_TIMEOUT seconds.
Bad Authorization Msg	Received a CC (channel control) packet with a bad authorization field.
Bad ECO CC Msg	Received a CC packet with an incompatible NISCA protocol ECO rev. field value.
Bad Multicast Msg	Received a bad multicast CC packet.
CC Short Packet	Received a CC packet that was too short.
CC Incompatible	Received a CC packet that was incompatible with existing channels for this virtual circuit.
Rcv Old Channel	Received a packet from an old instance of a channel.
No MSCP Server	No MSCP server available to respond to a received channel control solicit service packet asking this node to boot serve another node.
Disk Not Served	Disk is not served by this system.
Buffer Size Change	Change in buffer size.

4.3.3.4 LAN Channel Remote System Data Page

The LAN Channel Remote System Data page, shown in Figure 4-19, displays LAN path remote system data.

Figure 4-19 LAN Channel Remote System Data Page

Table 4-19 describes the data displayed in Figure 4-19.

Table 4-19 LAN Channel Remote System Data

Data	Description
Node Name	Node name of remote system.
Buffer Size	Buffer size (largest possible buffer size) of remote system.
Max Buffer Size	Current upper bound on buffer size usable on this channel.
Services	NISCA services supported on this channel.
Dev Name	Name of the remote LAN device.
LAN Address	Remote hardware address.
H/W Type	Hardware type of remote node.
Protocol Version	NISCA protocol version of remote system.

4.3.3.5 LAN Channel ECS (Equivalent Channel Set) Criteria Data Page

The LAN Channel ECS Criteria Data page, shown in Figure 4-20, displays equivalent channel set criteria data.

Figure 4-20 LAN Channel ECS Criteria Data Page

Table 4-20 describes the data displayed in Figure 4-20.

Table 4-20 LAN Channel ECS Criteria Data

Data	Description
ECS Membership	ECS membership status; that is, Member or Nonmember.
Time Entered ECS	Last time this channel entered the ECS.
Time Exited ECS	Last time this channel exited the ECS.
Total Time in ECS	Total time this channel was in the ECS.
Losses	Value representing channel's recent packet loss history.
Capacity	Channel's capacity rating based on evaluating its priority, buffer size, and hops values relative to the current ECS criteria. Values are: Ungraded, Peer, Inferior, Superior.
Priority	Channel's current priority for ECS calculations; it is the sum of the management priorities assigned to the local LAN device and to the channel.
Management Priority	Dynamic management-assigned priority.
Buffer Size	Negotiated maximum common buffer size: the smaller of local and remote BUS$ limits on block data field sizes.
Management Buffer Size	Maximum block data field size assigned by dynamic management.
Hops	Number of switches or bridges for this channel.
Management Hops	Management-supplied hops or media packet storage equivalent.
Speed	Classification of channel's delay relative to that of the lowest delay of any ECS member.
Average RTT	Average measured round-trip time.
Load Class	Lesser of the local and remote LAN device load class values.
Local Seq Number	Sequence number of the local channel.
Remote Seq Number	Sequence number of the remote channel.

4.3.4 LAN Adapters Detail Data

To display LAN adapters details data, right-click a LAN path (channel) summary data item on the Cluster Summary page (see Figure 4-6). The Availability Manager then displays a popup menu with the following options:

• Channel Details...
• Adapter Details...
• Fixes...

To display adapter details, select the Adapter Details... item on the menu. After a brief delay, a LAN Adapter Overview Data page (shown in Figure 4-21) is displayed.

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

4.3.4.1 LAN Adapter Overview Data Page

Figure 4-21 LAN Adapter Overview Data Page

Table 4-21 describes the data displayed in Figure 4-21.

Table 4-21 LAN Adapter Overview Data

Data	Description
Status	Device status: Run, Online, Restart; or Not in use by SCA.
Device Name	LAN adapter's device's name.
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.

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