The HUB monitoring function issues the ping command to adjacent HUB at regular intervals and switches the interface to be used when a line failure is detected. Up to two HUBs can be registered per virtual interface. This function is available exclusively for NIC switching mode.
Point
HUB monitoring function for NIC switching mode supports both configuration of the monitoring target for each virtual interface and start/stop of router monitoring.
This function can also monitor a transfer path between two HUBs (this is called HUB-to-HUB monitoring function). HUB-to-HUB monitoring function, detects a failure between two HUBs. This function can thus prevent a communication error from occurring due to NIC switching when a HUB-to-HUB failure occurs.
Information
If the standby patrol function is used, the HUB-to-HUB monitoring is not required because the standby patrol function is contained in HUB-to-HUB monitoring function. (See "2.2.8 Standby patrol function.")
Figure 2.24 HUB monitoring function shows an outline of the HUB monitoring function
Figure 2.24 HUB monitoring function
Point
If a hub cannot have an IP address, IP address of a host or a router that is connected to the hub can be monitored. However, if the monitored host or router stops, polling the host or router fails and a NIC switching event might occur. In order to prevent an unnecessary switching process, it is recommended to set up two monitoring targets, as well as enabling HUB-to-HUB monitoring function in case one of the monitoring targets stops.
Note
Refer to "7.7 hanetpoll Command" for configuration of HUB-to-HUB monitoring feature.
When using a single HUB, you can have only one configuration for a remote end, however, all the multiplexing transfer paths become unavailable if the HUB breaks. Therefore, it is not recommended to operate with a single HUB.
If the operation starts without HUB-to-HUB monitoring function, the primary HUB (HUB1 in the Figure 2.25 HUB-to-HUB monitoring disabled) is monitored using the ping command. When a failure is detected in the primary HUB, the NIC of the currently active system is inactivated and then the standby NIC is activated. After the standby NIC is activated, the secondary HUB (HUB2 in the Figure 2.25 HUB-to-HUB monitoring disabled) is monitored using the ping command.
Figure 2.25 HUB-to-HUB monitoring disabled
If the operation starts using the HUB-to-HUB monitoring function, the secondary HUB (HUB2 in the Figure 2.26 HUB-to-HUB monitoring enabled (failure on the secondary monitoring)) is monitored using the ping command.
When a failure is detected on the secondary hub, HUB-to-HUB monitoring function starts polling the primary hub, as well as polling the secondary hub (Swutch/HUB1 in Figure 2.26 HUB-to-HUB monitoring enabled (failure on the secondary monitoring)).
(During this occasion, a monitoring failure message (No.872) regarding the secondary HUB will be output. Use this message to investigate the cause of the failure.)
Once the polling process on the primary HUB starts, this function then monitors both secondary and primary HUBs interchangeably. Monitoring process against the secondary HUB is recovery monitoring and it will stop monitoring the primary HUB when HUB-to-HUB monitoring function detects recovery of the secondary HUB. HUB-to-HUB monitoring function determines transfer path failure by checking the number of monitoring failures (the default is 5 times). If failures were detected repeatedly on both primary and secondary HUBs, then it determines there was transfer path failure. Note that a message (No.872) will be reported regarding the failure on the secondary HUB, therefore it is possible to recover the secondary HUB before the primary HUB switches to secondary HUB.
When a failure is detected on the primary HUB after switching to the secondary interface due to a transfer route error, a message (No.873) will be reported.
Figure 2.26 HUB-to-HUB monitoring enabled (failure on the secondary monitoring)
Figure 2.27 HUB-to-HUB monitoring enabled (failure on the primary monitoring)
On HUB monitoring function over NIC switching mode, it is possible for each virtual interface to set up start/stop of the transfer path monitoring, monitoring count, monitoring interval, and cluster failover in the case of network error. The setting in the following figure can be configured.
Figure 2.28 Monitoring on individual virtual interface
When changing monitoring interval and monitoring count
Set parameters by using the "hanetpoll on" command after setting the ping monitoring destination. Note that the value of Common monitoring information (Standard Polling Parameter) is set for any parameter options that are not set. In the following example, the monitoring interval (-s) and monitoring count (-c) are specified for sha1.
/opt/FJSVhanet/usr/sbin/hanetpoll on -n sha1 -s 2 -c 3 |
Check individual parameters.
# /opt/FJSVhanet/usr/sbin/hanetpoll print
[ Standard Polling Parameter ]
interval(idle) = 5( 60) sec
times = 5 times
max_retry = 5 retry
repair_time = 5 sec
link detection = NO
failover mode = YES
[ Polling Parameter of each interface ]
Name Hostname/Polling Parameter
+-------+---------------------------------------------------------------+
sha0 192.13.80.251,192.13.80.252
hub-hub poll = OFF
interval(idle) = 5( 60) sec
times = 5 times
max_retry = 5 retry
repair_time = 5 sec
link detection = NO
failover mode = YES
Name Hostname/Polling Parameter
+-------+---------------------------------------------------------------+
sha1 192.13.81.251,192.13.81.252
hub-hub poll = OFF
interval(idle) = 2( 60) sec
times = 3 times
max_retry = 5 retry
repair_time = 5 sec
link detection = NO
failover mode = YES |
When restricting the failover in the case of HUB monitoring failure
Set parameters by using the "hanetpoll on" command after setting the ping monitoring destination. Note that the value of Common monitoring information (Standard Polling Parameter) is set for any parameter options that are not set. In the following example, the monitoring interval (-s), monitoring count (-c), and others are not specified, so Standard Polling Parameter will be set.
/opt/FJSVhanet/usr/sbin/hanetpoll on -n sha0 -f no |
Check individual parameters.
# /opt/FJSVhanet/usr/sbin/hanetpoll print
[ Standard Polling Parameter ]
interval(idle) = 5( 60) sec
times = 5 times
max_retry = 5 retry
repair_time = 5 sec
link detection = NO
failover mode = YES
[ Polling Parameter of each interface ]
Name Hostname/Polling Parameter
+-------+---------------------------------------------------------------+
sha0 192.13.80.251,192.13.80.252
hub-hub poll = OFF
interval(idle) = 5( 60) sec
times = 5 times
max_retry = 5 retry
repair_time = 5 sec
link detection = NO
failover mode = NO
Name Hostname/Polling Parameter
+-------+---------------------------------------------------------------+
sha1 192.13.81.251,192.13.81.252
hub-hub poll = OFF
interval(idle) = 2( 60) sec
times = 3 times
max_retry = 5 retry
repair_time = 5 sec
link detection = NO
failover mode = YES |
When restoring the parameters of the virtual interfaces individually set
Execute the "hanetpoll on" command to restore the parameters of the virtual interfaces individually set. In the following example, parameters set to the virtual interface sha0 are restored.
/opt/FJSVhanet/usr/sbin/hanetpoll on -n sha0 -d |
Check that individual parameters are deleted.
# /opt/FJSVhanet/usr/sbin/hanetpoll print
[ Standard Polling Parameter ]
interval(idle) = 5( 60) sec
times = 5 times
max_retry = 5 retry
repair_time = 5 sec
link detection = NO
failover mode = YES
[ Polling Parameter of each interface ]
Name Hostname/Polling Parameter
+-------+---------------------------------------------------------------+
sha0 192.13.80.251,192.13.80.252
hub-hub poll = OFF
interval(idle) = 5( 60) sec
times = 5 times
max_retry = 5 retry
repair_time = 5 sec
link detection = NO
failover mode = YES
Name Hostname/Polling Parameter
+-------+---------------------------------------------------------------+
sha1 192.13.81.251,192.13.81.252
hub-hub poll = OFF
interval(idle) = 2( 60) sec
times = 3 times
max_retry = 5 retry
repair_time = 5 sec
link detection = NO
failover mode = YES |
See
For details on configuring monitoring target for each virtual interface, refer to "7.7 hanetpoll Command".
When sharing NIC, you can set only the parameters of failovers for each virtual interface. Other parameters use values of the virtual interface initially defined.
