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  1. The Bringer of Light DevilWAH's Avatar
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    #351
    Possible (good answer so you get a point), so now you check and see the vlan is on the switch and is not shut-down, but still no traffic is passing...
    • If you can't explain it simply, you don't understand it well enough. Albert Einstein
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  3. VCDX in 2017 Essendon's Avatar
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    #352
    Security settings on the portgroup/switch.
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  4. The Bringer of Light DevilWAH's Avatar
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    #353
    could be but i was looking for

    "the switch port has the native vlan set to vlan 10"

    Cisco switchs do not tag traffic on the native vlan, a trunk port connected to a esxi host will not pass data on the native vlan, vmware recomend that you insure the native vlan on the switch port is a vlan unused by teh vmware estate .

    VMware KB: Configuring Network Switches for VLAN Tagging

    while its not good practice to used vlan 1, this is by default the native vlan on a switch.

    to resolve either change the native vlan to an unused vlan (recomended) or use the swotch port commend "tag native vlan" so all packets are expected to have a vlan tag.
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  5. VCDX in 2017 Essendon's Avatar
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    #354
    Yep, I agree with this and admit it didn't spring to my mind. Your questions highlights the need to think outside the box. Many of us virtualization folks lack decent networking skills.
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    #355
    Quote Originally Posted by Essendon View Post
    Yep, I agree with this and admit it didn't spring to my mind. Your questions highlights the need to think outside the box. Many of us virtualization folks lack decent networking skills.
    Was going to say native vlan but I just kept on reading...

    Guess this is where I should have read this thread earlier huh.... this is where you say networking and VMware go hand-n-hand huh Manny.
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  7. The Bringer of Light DevilWAH's Avatar
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    #356
    Quote Originally Posted by Essendon View Post
    Yep, I agree with this and admit it didn't spring to my mind. Your questions highlights the need to think outside the box. Many of us virtualization folks lack decent networking skills.
    Yer this one caught me out twice in the course of a few months, and its a bugger to trouble shoot because unless you know how to get under the hood on the systems there is no errors thrown up.

    Often its where two systems meet that the issues happen.
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  8. kj0
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    #357
    Q. You're an administrator noticing some strange issues with time sync. You notice that each time you migrate a VM, the guest time changes. You note that the ESXi host that you migrate too has an incorrect time, you also note that your "Sync Guest OS time with host" option is unticked. You correct the time on the host and point it to a new NTP server and restart the service.
    To prevent this from happening again when a new host is added with the wrong NTP settings, what must you also change with the VM?
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    #358
    Quote Originally Posted by kj0 View Post
    Q. You're an administrator noticing some strange issues with time sync. You notice that each time you migrate a VM, the guest time changes. You note that the ESXi host that you migrate too has an incorrect time, you also note that your "Sync Guest OS time with host" option is unticked. You correct the time on the host and point it to a new NTP server and restart the service.
    To prevent this from happening again when a new host is added with the wrong NTP settings, what must you also change with the VM?
    throwing out a guess here cause I recently did this myself but I would turn off the VMware tools periodic time synchronization. To me Windows Time (Win32Time) is way more accurate than VMware tool, sadly.

    Alternatively, if you still have hope for VMware, lol! - you can right click the VM and go to settings, then click on the option tab and then click on the VMware tool setting and tick the 'Synchronize guest time with host' option in the Advanced section on the bottom right.
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  10. kj0
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    #359
    Quote Originally Posted by Deathmage View Post
    throwing out a guess here cause I recently did this myself but I would turn off the VMware tools periodic time synchronization. To me Windows Time (Win32Time) is way more accurate than VMware tool, sadly.

    Alternatively, if you still have hope for VMware, lol! - you can right click the VM and go to settings, then click on the option tab and then click on the VMware tool setting and tick the 'Synchronize guest time with host' option in the Advanced section on the bottom right.
    But what happens if you add a new host with the incorrect time settings and the VM migrates to it? How do you prevent the sync from happening and allow the Guest OS to stay in sync with it's specified NTP source?



    [Edit] this is something that is highly recommended to know, I've been caught once in production environment with it.
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    #360
    Quote Originally Posted by kj0 View Post
    But what happens if you add a new host with the incorrect time settings and the VM migrates to it? How do you prevent the sync from happening and allow the Guest OS to stay in sync with it's specified NTP source?



    [Edit] this is something that is highly recommended to know, I've been caught once in production environment with it.
    untick the 'Synchronize guest time with host' option? - only other thing I can think of is to make a host profile with the NTP service off. If this isn't it, I'd learn something new.
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  12. VCDX in 2017 Essendon's Avatar
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    #361
    From memory there's an advanced host setting for this, dont remember exactly what though.
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  13. kj0
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    #362
    Alright, Answer time.

    Whilst the VM is sitting on the host, if you have deselect "Sync Guest OS with host" VMTools option, the time will sync with where you have pointed the guest OS for NTP server.
    When you vMotion or perform a series of events, the guest will sync with the host by default - this can cause issues if the host time is out of Sync.

    To prevent the guest OS ever syncing with the Host time, you need to add additional lines to the VMX of the guest VM. VMware KB: Disabling Time Synchronization
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    #363
    Quote Originally Posted by kj0 View Post
    Alright, Answer time.

    Whilst the VM is sitting on the host, if you have deselect "Sync Guest OS with host" VMTools option, the time will sync with where you have pointed the guest OS for NTP server.
    When you vMotion or perform a series of events, the guest will sync with the host by default - this can cause issues if the host time is out of Sync.

    To prevent the guest OS ever syncing with the Host time, you need to add additional lines to the VMX of the guest VM. VMware KB: Disabling Time Synchronization
    adding this too the toolbox. I would have never thought of that!
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  15. The Bringer of Light DevilWAH's Avatar
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    #364
    Question. (hopping the answer might help others in the progress of upgrading)

    you update esxi5.5 to version 6. upon reboot you notice that the hosts not longer have there physical nics attached to the distributed switch and attempting to re-add them end in an error message.

    What setting might be causing this, and haw can you resolve it?
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  16. VCDX in 2017 Essendon's Avatar
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    #365
    Unaware of a setting, but are they on the HCL? Gotta look at the error message first!
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  17. The Bringer of Light DevilWAH's Avatar
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    #366
    Its not specifically to do with HCL, its a network setting that is global per host. The error you will see when trying to add a physical nic from an affected host will contain the line. " Unsupported address family".

    this kind of gives it away if you want to google it so the KB is here describing the issue and fix..

    But any guess before you look? I really posted this as I know people will be looking to upgrade and this is a good one to check before you do to prevent issues with the process.
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  18. Junior Member Registered Member
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    #367
    Data Virtual Volume Size MAX = 62TB

    https://www.vmware.com/pdf/vsphere6/...n-maximums.pdf
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    #368
    Hello guys I am new here and this is an epic thread!

    Can anyone join in with questions?

    You have a host that no one knows the root password for, what method can you use to recover that are/are not covered by vmware?
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  20. VCDX in 2017 Essendon's Avatar
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    #369
    Let's revive this thread, let's inject some life again!

    @piedpiper - anyone can chime in with questions and answers. Just make the question's font red so it stands out.

    Questions:

    Capture.JPG

    The Visio's mostly obvious. The RAM numbers are reservations at all levels of the hierarchy. The cluster has 24GB RAM to dish out.

    Consider all VMs are currently powered off. The power-on events will go like this, VM1 > VM2 > VM3.... > VM8

    1. You power on VM1, it boots up no worries. Will VM2 boot up too? Why?

    2. Say VM2 was able to power on, you then power on VM3, will VM4 then be able to power up too?

    3. Will you be able to power up VM5 and VM6? Why?

    4. Will you be able to power up both VM7 and VM8?

    5. What can you do to ensure all VMs power up?

    6. Does this make you think resource pools arent a good idea? If so, why?
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  21. Reticulating splines... iBrokeIT's Avatar
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    #370
    Wow! That's a great resource pool question Essendon, I hope you guys are tossing him some +Rep

    I really dislike resource pools because most people don't really understand them and misuse them as folders to organize their VMs then have performance issues with their VMs during contention or during a host reboot.
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  22. VCDX in 2017 Essendon's Avatar
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    #371
    Thanks mate! Gotta spread the knowledge. If I can assist one person in getting their VCP and hopefully their VCAP/VCIX, this thread and my time has been well worth it.
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  23. Not IT n00b dave330i's Avatar
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    #372
    Guess I take a crack at the RP questions. Haven't worked with RP in a while so I'm rusty. I'll keep my answers in white.

    1. VM2 will not boot since the RP doesn't have enough resources, the parent pool doesn't have enough resources and the parent isn't expandable.

    2. VM4 won't boot since the RP doesn't have enough resources and it is not expandable.

    3. This one is tricky. VM5 will power on, while VM6 won't due to overhead resource requirement and the RP isn't expandable.

    4. VM7 & 8 should power on since the RP and parent RP are expandable and there are enough resources within the cluster.

    5. You could increase the RP reservations, enable expandable reservations on all RPs, dump reservations and go with shares.

    6. Nested RPs are a pain. If you use share vs. Reservations and size them correctly, they can be useful.
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  24. VCDX in 2017 Essendon's Avatar
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    #373
    Done well Dave.

    Everyone else - review the question and answer 10 times if you need to. You must understand RPs for your VCPs and VCAPs..
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  25. VCDX in 2017 Essendon's Avatar
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    #374
    Question:

    You are the administrator of an environment that is located across 2 physical datacenters. Datacenter A is your production site and Datacenter B is the DR site. The vSphere version at both sites is at 5.5 and SSO operates in basic mode (vCenter and SSO on same VM). You need to upgrade to 6.0 and there's a new VDI project that is shaping up that's going to need a dedicated vCenter. How would you do this?

    1. Upgrade vCenter and SSO to 6.0 embedded PSC and point the 2nd vCenter to the PSC. Upgrade VUM, use it to upgrade hosts to 6.0 and move VMs to hardware version 11
    2. Deploy standalone instance of SSO 5.5, repoint vCenter 5.5 to new SSO 5.5, decommission old SSO, upgrade SSO 5.5 to 6.0, upgrade VUM, upgrade vCenter, upgrade hosts and move VMs to hardware version 11
    3. Upgrade vCenter and SSO to 6.0 embedded PSC and point the 2nd vCenter to the PSC. Upgrade VUM, use it to upgrade hosts to 6.0 and move VMs to hardware version 12
    4. Deploy standalone instance of SSO 5.5, repoint vCenter 5.5 to new SSO 5.5, decommission old SSO, upgrade SSO 5.5 to 6.0, upgrade vCenter, upgrade VUM, upgrade hosts and move VMs to hardware version 11

    Choose one option.
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    #375
    Wish I could use Resource Pools here, I love them at home. I have to run in EVC mode, so no pools for me.

    Quote Originally Posted by Essendon View Post
    Thanks mate! Gotta spread the knowledge. If I can assist one person in getting their VCP and hopefully their VCAP/VCIX, this thread and my time has been well worth it.

    Cough, you already have with me.
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