An administrator is troubleshooting a vSAN performance issue. In the vSAN performance monitor there is a high latency on the vSAN cluster. What is a possible cause of this?

The correct answer is C. There is congestion in one or more disk groups. Most often, the increase in latency may be correlated with the issue of congestion in one or more disk groups (KB 2150012). Congestion is a feedback mechanism to slow down the rate of incoming IO requests from the vSAN DOM client layer so that the rate of IO requests to the…

Troubleshooting and Repairing VMware vSAN

Question

Options

AThe Virtual Machines are using PVSCSI controllers.
BErasure Coding is disabled in the storage policy.
CThere is congestion in one or more disk groups.
DJumbo frames are not enabled on the VMkernel adapters.

How the community answered

(25 responses)

A
4% (1)
B
8% (2)
C
76% (19)
D
12% (3)

Explanation

Most often, the increase in latency may be correlated with the issue of congestion in one or more disk groups (KB 2150012). Congestion is a feedback mechanism to slow down the rate of incoming IO requests from the vSAN DOM client layer so that the rate of IO requests to the vSAN disk group can match the rate of IOs that the disk group can service. https://kb.vmware.com/s/article/2150018

Topics

#high latency#disk group congestion#performance troubleshooting#vSAN performance monitor

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