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Hanging zones are the purposeless zones residing in the zoning configuration. In case an error is listed, before troubleshooting clear the status using below commands and observe it again.Īpart from this, there are other commands to display the current data transfer rate of a port or all ports, such as: #porterrorshow -i Port_Index Both these commands will list the errors in a particular port. #porterrshow This will list all ports in error state. Physical layer issue is, either Cable issue or SFP issue.īelow are the commands to identify the port errors: Bottleneck issue we have already addressed above. Most of the time, its due to bottleneck issue/ physical layer issue. If there is latency or congestion bottleneck, it should to be fixed by logging a support case with Server/Storage hardware vendor. The commands used to identify latency as well as congestion bottleneck are: In the next write-up we will discuss in detail, about the causes of a congestion bottleneck. Whereas, Congestion bottleneck occurs due to high rate of data transfer in the port. SFP which has a voltage or power issue.Slow drain devices, is a device which either has all or any one of the bellow mentioned issues: Even initiator or target ports can report latency, no matter what kind of port it is, if a slow drain device is attached, there will be bottleneck in that port. Latency bottleneck occurs when a slow drain device is connected to the port. But, the once prominent in SAN fabric are Latency bottleneck and congestion bottleneck. #zoneshow –alias Alias_Name This lists the zone name and component aliases. #alishow |grep wwn -b2 This lists the alias. In order to know the zoning details through the WWN of the device, use below mentioned command: As both the activities clear the fabriclog.

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Note: This command will fail in case the FOS upgrade or Switch reboot activity was performed.

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#fabriclog -s |grep -E “ Port Index |GMT” This command states the ports which went offline before. #fabriclog -s States the ports which went offline recently. Thus, when ‘WWN/ Alias went offline’ is recorded, use the below mentioned commands to identify, when the port went offline and which port went offline. This error is recorded due to the following reasons: Please share your thoughts in the comments section. Hope you enjoyed reading this post and was helpful for you. We can define all the fault domains at the chassis level, so that replicas will not reside in the same chassis. Same applies for the chassis level or any other level protection. Thus the administrator can plan for any maintenance activities at the rack level without any disruption of the services running on the vSAN. We can define all the hosts in the same rack to be part of one Failure Domain and thus data and its replica will never be in the same (host in the same) rack. In case of Failure Domain configuration, the replicas will be saved in different Failure Domains. We will discuss the IO operation in vSAN, in a separate post. Even if one of the host fails, the data will be still accessible as the replica will be available on the host and thus IO operation continues. If the FTT=1, the write will be send to 2 hosts at the same time.

In a vSAN cluster, writes will be send to multiple hosts/drives depending on the Storage policy and the Failures To Tolerate (FTT) settings. There should be a minimum of 3 fault domains for having this enabled on a cluster. If a customer want to avoid data inaccessibility during a chassis failure or power failure in a rack etc… customer can do so by setting the right fault domains. Fault Domains helps an administrator to design the failure scenarios that may occur in a vSAN cluster.