Method used to calculate fiber loss

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In general, the fiber loss budget for the 1310 nm wavelength is 0.45 dB/km and that for the 1550 nm wavelength is 0.275 dB/km.

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Method used to calculate RAID capacity
If the number of RAID member disks is N (excluding hot spare disks), available capacity of RAID 0 = N x disk capacity. Available capacity of RAID 1 = N x Disk capacity/Number of mirror groups Available capacity of RAID 3 = (N-1) x Disk capacity Available capacity of RAID 5 = (N-1) x Disk capacity Available capacity of RAID 6 = (N-2) x Disk capacity Available capacity of RAID 10 = N x Disk capacity/Number of mirror groups Available capacity of RAID 50 = (N-2) x Disk capacity

Method used to calculate the RGU position
The installation point of the buried RGU on the fiber span leading to the receive-end station must be carefully calculated. The designed distance of the fiber span from the RGU to the receive-end station, and the designed loss of this post-RGU fiber span must be determined based on the system configurations and the total line loss (deriving from factors such as the span length and fiber loss factor).

Method used to handle the license certificate loss problem
The method used to handle the license certificate loss problem is as follows: Log in to the ESDP platform (http://app.huawei.com/isdp) and retrieve the license certificate based on the Contract No. or call the customer service hotline (400-822-9999).

Method used to calculate a linked clone VM's storage resources
The storage resources required by a linked clone VM are calculated as follows: Formula: ROUNDUP (N/128, 0) x Size of the base volume + N x Average size of delta volumes. The average size of delta volumes needs to be calculated based on the site situation. Generally, the estimated average size is 5 GB.

How to check ping packet loss on S series switches
For S series switches (except the S1700), you can run the ping command to check ping packet loss directly. For example: [HUAWEI] ping -c 100 192.168.2.21 PING 192.168.2.21: 56 data bytes, press CTRL_C to break Reply from 192.168.2.21: bytes=56 Sequence=1 ttl=124 time=1 ms ... --- 192.168.2.21 ping statistics --- 100 packet(s) transmitted //Total number of sent packets 91 packet(s) received //Total number of received packets 9.00% packet loss //Packet loss ratio round-trip min/avg/max = 1/1/19 ms You can also perform the following steps to configure traffic statistics collection to check ping packet loss: Configure traffic statistics collection for packets received by a switch. 1. Configure an ACL rule. [HUAWEI] acl number 3000 [HUAWEI-acl-adv-3000] rule permit icmp source 192.168.2.21 0 destination 192.168.2.20 0 [HUAWEI-acl-adv-3000] quit 2. Configure a traffic classifier. [HUAWEI] traffic classifier 3000 [HUAWEI-classifier-3000] if-match acl 3000 [HUAWEI-classifier-3000] quit3. Configure a traffic behavior. [HUAWEI] traffic behavior 3000 [HUAWEI-behavior-3000] statistic enable [HUAWEI-behavior-3000] quit 4. Configure a traffic policy. [HUAWEI] traffic policy 3000 [HUAWEI-trafficpolicy-3000] classifier 3000 behavior 3000 [HUAWEI-trafficpolicy-3000] quit 5. Apply the traffic policy to an interface. [HUAWEI] interface gigabitethernet 0/0/2 [HUAWEI-GigabitEthernet0/0/2] traffic-policy 3000 inbound [HUAWEI-GigabitEthernet0/0/2] quit 6. Check traffic statistics of packets received by the switch. [HUAWEI] display traffic policy statistics interface gigabitethernet 0/0/2 inbound verbose rule-base //The output is omitted. For more information about ping packet loss, see "Ping Failure Troubleshooting" or "S Series Switches packet Loss Troubleshooting" in "Maintenance Topics" in the Huawei S Series Campus Switches Maintenance Guide.

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