Problem and solution when the round robin load balancing policy of NMP does not take effect in HP_UX

6

You can perform the following operation when round robin load balancing policy of NMP does not take effect in HP_UX as follows:
1. Issue Description
What can I do when the round robin load balancing policy of NMP does not take effect in HP_UX?
Situation: HP 11i v3 is delivered with the Native Multi-Path multipathing software and the default load balancing policy round robin. Multiple paths from the hosts to controller A or controller B on the storage array do not take effect, and you can only deliver I/Os through one path.
2. Solution
a. Enter scsimgr get_attr -a leg_mpath_enable on the host to check whether the current system has enabled NMP multipathing software.
b. Enter scsimgr get_attr -D /dev/rdisk/diskXX -a leg_mpath_enable to check whether LUN has enabled the NMP software.
c. Enter scsimgr get_attr -D /dev/rdisk/diskXX to check whether LUN has a default load balancing policy round robin.
d. Enter scsimgr lun_map -D /dev/rdisk/diskxx to check which LUN has active status of all paths.
e. Enter scsimgr get_stat -H Hardware path to check the I/O statistics of each path to the LUN. If the I/Os of one path is small, nearly no I/O is delivered on this path.
f. Above all, although the NMP multipath configuration does not cause any failure, there is a problem which is referred on released notes.
You solve the problem by setting alua_enabled of a LUN to false. However, based on lab tests, this method can deliver I/Os through multiple paths but the performance of this method degrades compared to I/Os delivered through one path. You are advised to use one path not to use multiple paths.

Other related questions:
AP load balancing does not take effect
To implement load balancing, the following requirements must be met; otherwise, configurations fail or do not take effect. 1. The requirements for a radio to join a load balancing group are as follows: - A radio can join only one load balancing group. - The newly added radios must be of the same type as other radios in the load balancing group. Radios in a hotspot area must be of the same type. Otherwise, load balancing cannot be achieved. The type of radios in a load balancing group is determined by the type of the first added radio. - The channel of a new radio must be different from channels of other radios in the load balancing group. If the channel of a new radio is the same as channels of other radios in the load balancing group, a radio signal collision occurs. To improve coverage areas and minimize collisions, APs in a hotspot area must be configured with different channels. To detect channel collisions, check the configured channel and actual channel of the radio. - More radios can be added to a load balancing group if it is not full. In a load balancing group, radios must be configured with different channels and all these radios must be of the same type. In addition, radios of the same type support limited and fixed channels. Therefore, the number of radios in a load balancing group is limited. 2. The load balancing function applies to scenarios where there is a high degree of overlapping between APs' coverage ranges. You can adjust the AP power to enable the APs' coverage areas to overlap. When the load difference between APs reaches the load difference threshold, some STAs may access the network slowly, because the APs will reject access requests of STAs according to the load balancing algorithm. If a STA continues to send association requests to an AP, the AP allows the STA to associate when the number of consecutive association attempts of the STA exceeds the maximum number of rejection times.

Problem and solution when an OSPF route filtering policy does not take effect
The reason that an OSPF route filtering policy does not take effect is as follows: For example: User ---------- MA5200F ---------- Firewall---------- NE80 ---------- Internet Open Shortest Path First (OSPF) is run on three devices, and the firewall acts as the NAT device. The NE80E cannot learn routes to private network segments. Firewall configurations are as follows: acl number 2999 rule 5 deny source 10.0.0.0 0.255.255.255 /*Filtered private network segments*/ rule 10 deny source 192.168.0.0 0.0.255.255 /*Filtered private network segments*/ rule 15 permit ospf 1 filter-policy export 2999 area 0.0.0.0 network 218.206.107.220 0.0.0.3 The routing table of the NE80 still has routes to private network segments. [JSNJ-MB-CMNET-RT01-HJL_NE80]display ip routing-table 10.33.16.192 Destination/Mask Protocol Pre Cost Nexthop Interface 10.33.16.192/26 O_ASE 50 1 218.206.97.234 Ethernet5/0/13 0.0.0.0/0 STATIC 40 0 218.206.97.109 GigabitEthernet1/0/ The route policy in the OSPF view of the firewall that uses the VRP3.30 platform takes effect only for local routes, not the LSA transmitted by the firewall to the NE80. In conclusion, because OSPF is a dynamic routing protocol based on link status and routing information is expressed through link status, OSPF cannot filter advertised or received LSAs. The filter-policy import command filters the routes calculated by OSPF. Only routes that match the filtering conditions are added to the routing table. The filter-policy export command enables a device to filter routes advertised by the device. Only routes that match the filtering conditions can be advertised.

Meaning of OceanStor 9000's round robin-based load balancing policy
In the round robin-based load balancing policy, nodes are selected in sequence to process client connection requests.

Problem and solution when the firewall system upgrade does not take effect
During firewall upgrade, you need to replace system software. After you set the system file for the next startup, you must restart the device for the configuration to take effect.

Does the DHCP relay support round robin on the device
In V100R006C00 and later versions, the DHCP relay supports round robin. By default, round robin is disabled. To enable round robin, run the ip relay address cycle command in the system view.

If you have more questions, you can seek help from following ways:
To iKnow To Live Chat
Scroll to top