Data Domain：建議採用連結彙總組態，而非透過兩個 DD 之間的直接連線介面進行容錯移轉
Summary: 在兩個 DDR 之間背靠背直接連接容錯移轉介面，可能無法傳輸資料。
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Symptoms
DD1 和 DD2 的介面 eth3b、eth4a 和 eth4b 背靠背直接相連。在兩個 DD 上，eth3b、eth4a 及 eth4b 均設定為參與容錯移轉繫結。容錯移轉介面的連結狀態顯示為「running」，但流量無法透過此容錯移轉介面在兩個 DD 之間流動。
不匹配的活動連結會導致這種情況。如果未配置主介面，則兩側的活動介面是任意的，並且它們可能不匹配。這可能會導致流向接收端的流量通過備用介面，並被備用介面丟棄。
DD1：
Net Failover Show ----------------- Ifname Hardware Address Configured Interfaces Up Delay (ms) Down Delay (ms) ------ ----------------- ------------------------------------------------- ------------- --------------- veth1 00:60:16:68:ed:41 eth3b, eth4a, eth4b, active: eth4b, primary: None 29700 29700 ------ ----------------- ------------------------------------------------- ------------- ---------------
DD2：
Net Failover Show ----------------- Ifname Hardware Address Configured Interfaces Up Delay (ms) Down Delay (ms) ------ ----------------- ------------------------------------------------- ------------- --------------- veth1 00:60:16:68:e9:21 eth3b, eth4a, eth4b, active: eth3b, primary: None 29700 29700 ------ ----------------- ------------------------------------------------- ------------- ---------------
Ping 失敗：
SE@DD1## net ping interface veth1 192.168.170.252 PING 192.168.170.252 (192.168.170.252) from 192.168.170.250 veth1: 56(84) bytes of data From 192.168.170.250 icmp_seq=11 Destination Host Unreachable From 192.168.170.250 icmp_seq=12 Destination Host Unreachable From 192.168.170.250 icmp_seq=13 Destination Host Unreachable From 192.168.170.250 icmp_seq=15 Destination Host Unreachable From 192.168.170.250 icmp_seq=16 Destination Host Unreachable From 192.168.170.250 icmp_seq=17 Destination Host Unreachable From 192.168.170.250 icmp_seq=19 Destination Host Unreachable
Cause
在直接連接的介面之間使用故障轉移時，應為兩端的故障轉移綁定配置匹配的主介面。
您可以在建立故障轉移時指定主介面：
net failover add <virtual interface> interfaces <slave interfaces> [primary <interface name>]
或者修改現有的容錯移轉虛擬介面以新增主要介面：
net failover modify <virtual interface> primary <interface name>
設定相符的主介面後：
DD1：
Net Failover Show ----------------- Ifname Hardware Address Configured Interfaces Up Delay (ms) Down Delay (ms) ------ ----------------- ------------------------------------------------- ------------- --------------- veth1 00:60:16:68:ed:41 eth3b, eth4a, eth4b, active: eth3b, primary: eth3b 29700 29700 ------ ----------------- ------------------------------------------------- ------------- ---------------
DD2：
Net Failover Show ----------------- Ifname Hardware Address Configured Interfaces Up Delay (ms) Down Delay (ms) ------ ----------------- ------------------------------------------------- ------------- --------------- veth1 00:60:16:68:e9:21 eth3b, eth4a, eth4b, active: eth3b, primary: eth3b 29700 29700 ------ ----------------- ------------------------------------------------- ------------- ---------------
Ping 現在可正常運作：
SE@DD2## net ping interface veth1 192.168.170.250 PING 192.168.170.250 (192.168.170.250) from 192.168.170.252 veth1: 56(84) bytes of data 64 bytes from 192.168.170.250: icmp_seq=1 ttl=64 time=1.09 ms 64 bytes from 192.168.170.250: icmp_seq=2 ttl=64 time=1.12 ms 64 bytes from 192.168.170.250: icmp_seq=3 ttl=64 time=1.14 ms
注意：如果一側的主介面出現故障，使用者仍可能面臨相同的問題。兩端將任意選擇其他鏈路之一處於活動狀態，並且兩端的活動介面可能不匹配。
Resolution
建議對直接連接的背對背介面使用 LACP 而不是故障轉移。請注意，如果總輸送量小於一個介面的輸送量，則可以使用 LACP。否則，發生故障轉移時總輸送量會下降。
總之，當介面直接連接時：
- 應指定主介面以使兩側都有活動介面
- 使用 LACP 而非容錯移轉。LACP 還提供故障轉移功能。
Additional Information
如需排查介面網路連線問題，請參閱 如何排查網路介面連線問題。
Affected Products
Data Domain, Data Domain Boost, Data Domain Boost - Open StorageProducts
Data Domain Boost – File System, Data Domain Deduplication Storage Systems, Data Domain Encryption, Data Domain Extended Retention, Data Domain GDA, Data Domain NDMP Tape Server, Data Domain Replicator, Data Domain Retention Lock
, Data Domain Storage Migration, Data Domain Virtual Tape Library, Data Domain Virtual Tape Library for IBM I/OS, Data Domain Virtual Edition, PowerProtect Data Domain Management Center, Storage Direct for Data Domain
...
Article Properties
Article Number: 000191681
Article Type: Solution
Last Modified: 26 Jul 2023
Version: 6
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