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Should I use das.failuredetectiontime or das.config.fdm.isolationPolicyDelaySec

Today I received a question around the use of das.failuredetectiontime and das.config.fdm.isolationPolicyDelaySec. Should you be using these advanced settings?

Short answer: no.

Long answer: This myth has been floating around for a long long time. Many people were under the impression that das.failuredetectiontime needed to be configured when you started adding additional isolation addresses.This is not the case!

I just received an email with the question if the same applied to vSphere 5.1 now that “das.config.fdm.isolationPolicyDelaySec” was introduced as a replacement for das.failiredetectiontime. The answer remains “no you should not be using this. Unless, unless there are specific networking requirements to do so. There is absolutely no need to increase the failure detection time / isolation policy delay when multiple isolation addresses are configured. Isolation addresses are pinged in parallel, which means no additional time is needed to complete this process.

In summary, it is not recommended to use these advanced settings unless you have specific networking requirements to do so.

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Duncan Epping

About Duncan Epping

Duncan Epping is Principal Architect at VMware (R&D, Integration Engineering) and is focused on vCloud / vSphere architecture and integration. He was among the first VMware certified design experts (VCDX 007). He is the co-author of several books, including best seller vSphere 5.1 Clustering Technical Deepdive. He is the owner and main author of the leading virtualization blog yellow-bricks.com.

5 thoughts on “Should I use das.failuredetectiontime or das.config.fdm.isolationPolicyDelaySec

  1. HA and DRS Deepdive 4.1

    Page 52

    “If an isolation validation address has been added, ” das.isolationaddress”, add 5000 to the default ” das.failuredetectiontime” ( 15000 )

    …is it a myth ?

    :)

    1. Duncan EppingDuncan Epping Post author

      Yes, false recommendation and after many discussions with engineering we figured out that the recommendation that someone developed in the 3.5 time frame was incorrect.

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