admin
Immortal
Immortal

HA Pre-req's <Gimme Question>.

For HA to work VMotion must be 100% working and all VMotion VMkernal ports should return a happy answer on being pinged?

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7 Replies
kastro
Enthusiast
Enthusiast

HA has nothing to do with VMotion. HA does ot migrate live VM on another host, but only restarts them on another host.

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MR-T
Immortal
Immortal

The main thing you need to get right for HA to work is name resolution.

Almost all errors relating to HA are down to name resolution.

Ensure each server can see the same storage and bobs ya uncle.

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Rodos
Expert
Expert

The following are requirements for running HA.

  1. Centralised licensing must be use for HA in all environments. You can not use host based license files.

  2. Virtual machine must reside on share storage (NAS, iSCSI and FC are all supported).

  3. The physical networks required by the virtual machines must be available to each host and the vSwitch(s) must have the same name on each host.

  4. HA is a licensed feature of VI3. HA is included in both the VI Standard and VI Enterprise license. You can not use VMware Server to provide HA.

  5. HA is an additive feature to 3i.

Also ensure you have good networking setup, have a redundancy in your console network. Consider changing some of the isolation paramaters, expecially the isolation response to leave running (its a global setting in 3.5 which is nice).

The document you want to read is http://www.vmware.com/files/pdf/VMwareHA_twp.pdf

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admin
Immortal
Immortal

OK

my name resolution is 100% working + I have created host file entries on all servers to each other inclusing VC, all ping name and nslookup is 100% any other ideas

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jhanekom
Virtuoso
Virtuoso

What are the symptoms you're seeing? (or not seeing?) What are the conditions you're testing HA under?

You seem concerned that HA might need VMotion to work (which, as it has been pointed out, it doesn't) - does this imply that VMotion is not currently working in your environment?

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dmorgan
Hot Shot
Hot Shot

One issue I had getting mine to work is that a previous net admin had disabled the ability to ping the default gateway. HA did not like this one bit, as it pings the default gateway to determine whether it has connectivity.

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Schorschi
Expert
Expert

For us, we had a misconfigured DNS entry, and drove HA nuts. Just adding to the list of things that can nail HA.

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