VMware tools not up to date caveats and issue ?

People,

I have just upgraded my ESXi servers from 5.1 Update 1 into 5.1 Update 3, do I need to update the VMware tools or can I just wait until I migrate them all to ESXi 6.0 Update 1 next year ?

What's the caveats and consequence of not updating VMware tools ?
note all of the VMs are windows and domain joined so I assume NTP is taken care by WIndows Active Directory domain.
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Senior IT System EngineerIT ProfessionalAsked:
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rindiCommented:
If new features have been included with the new tools and drivers, you wouldn't be able to use those. Or if bugs were fixed or security holes stuffed, you also wouldn't have those fixes and might get vulnerable to attacks.
Senior IT System EngineerIT ProfessionalAuthor Commented:
ok, does it stops VMware backup or can cause them to be failed ?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
The VMware official answer is if your tools are Out Of Date, then the configuration is *NOT SUPPORTED*, and has not been tested.

So weird things could happen, or they may not.

We don't jump and update tools immediately, we wait for Scheduled Maintenance of the VM, e.g. Patch Tuesday, when we patch VMs with Microsoft Security Updates and Criticial Fixes, and the same applies to VMware Tools - security issues, critical fixes, with memory leaks...

Out of date VSS driver could cause Backups to Fail.

What you have to remember, if your VM has been updated, with Microsoft patches, security and critical fixes, old versions of VMware Tools may have conflicts.

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Senior IT System EngineerIT ProfessionalAuthor Commented:
Ok,
 So what about if I update it all to the latest VMWare tools which is now stand alone version 10 ?

Is it recommended ?
My understanding is there will be downtime as in few ping packet losts.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
In our organisation, all changes to Production Servers, come under Change Control, and as such, we schedule these activities, and ensure we have adequate rollback, should an update or change to VM fail.

It is recommended, but I would make a plan, and assume the worst case.
Senior IT System EngineerIT ProfessionalAuthor Commented:
ok, what I don't understand is that why the not updated VMware tools can cause VMware VM (CBT) backup issue ?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
ok, what I don't understand is that why the not updated VMware tools can cause VMware VM (CBT) backup issue ?

you will have to expand on that....

but updating VMware Tools, not really anything to do with CBT, it can be the registration of the VSS driver, sync driver which VMware Tools uses to quieces the file system, when a snapshot command is issued! - which ensures the file system or application is consistent! - does not register correctly, or breaks the existing VSS writers!

Look at what VMware Tools installs.....drivers, services, registration with VSS.
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