Why does VM migration take 10 minutes


During VM migration, a VM migrates from one server to another server. When the two servers connect to different switch ports, the VM does not send free ARPs but sends RARPs. Therefore, the switch refreshes MAC addresses to the new port and the packets refresh ARPs to the new port properly. Services are interrupted for some time.

The 10 minutes duration is the ARP aging time of the original port.

To avoid service interruption, you need to enable the MAC-ARP association function. In V100R006 and later versions, run the mac-address update arp command in system mode to enable this function. For details, see MAC Address-Triggered ARP Entry Update.

Other related questions:
Why the MAC-VLAN does not take effect
MAC address-based VLANs take effect only to untagged packets. If an MAC address-based VLAN does not take effect, check whether the incoming packets contain VLAN tags.

Slow access of WLAN terminals
Methods of troubleshooting the problem related to slow user access: 1. The wireless air interface is of poor quality. - Use automatic channel optimization to properly plan the channels, and adjust the special areas to reduce overlapping channels. - Adjust the power to ensure strong signals. - Rule out other interference sources by using the WirelessMon or inSSIDer tool. 2. The NICs of some terminals cause the slow access. The access of certain users is slower than that of other users. Replace the NICs or terminals. 3. The intermediate network causes the slow access. - The problem of slow user association widely occurs in certain floors of buildings. It is probably the long latency of the intermediate network that causes the slow user access. - Ping the APs, DHCP server, RADIUS server, and users from the AC to determine the locations where network latency occurs. 4. The load balancing causes the slow user access. WLAN load balancing is used to balance the load of the clients on a WLAN, which ensures the performance and bandwidth of each client. This function is applied only in high-density wireless network environments. If load balancing is enabled in sparsely-populated areas (each AP covers fewer than 15 users), it cannot function as expected, and slow user association speed may be caused due to APs' denial of user association. - Use load balancing in some densely-populated scenarios. - Change the load balancing threshold into a proper value to decrease the load balancing triggering frequency. - Reduce the times of reconnection and shorten the time for users in denial due to load balancing reasons.

Whether VMs can be migrated across clusters
The desktop solution does not support cross-cluster VM migration. In Huawei's desktop solution, a single cluster supports 100 servers, and each server can house up to 250 VMs. This ensures the reliability of VM clusters even without cross-cluster VM migration.

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