ESX 4.1 hangs and stuck for a long time ?

Hi,

I'm seeking your help in troubleshooting my production ESX 4.1 host that stuck in the rebooting process.

Stuck
debug
stuck
this host only can see 3x VMFS datastore presented by the old EMC CX3, so I'm not sure why it is stuck more than 4 hours today in rebooting ?

Any kind of help and assistance would be greatly appreciated.

Thanks
LVL 9
Senior IT System EngineerIT ProfessionalAsked:
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AkshayNaikCommented:
This is a known issue affecting VMware ESX 4.x

Work around this issue by temporarily or permanently removing references to the unavailable DNS servers. If the host is currently stuck in the boot process, the DNS configuration can be changed using an SSH connection to the host.

To remove the DNS server references:

- Log in to the ESX/ESXi host as the root user using SSH.
- Open the file /etc/resolv.conf in a text editor.
- Make record of the current DNS server(s) in the configuration file. For example:

nameserver 10.11.12.13

- Remove any reference to any unreachable DNS server(s).
- Save the configuration file.
- Reboot the ESX/ESXi host gracefully, using this command:

reboot
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
No LUNs have been removed from the ESX server which it's expecting to mount?
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Senior IT System EngineerIT ProfessionalAuthor Commented:
HancockA,
Well, you almost right, there used to be plenty of LUN that was presented to this host, since it has been migrated across only 3 remains.

@Akshay: how can I perform any operations when the ESX host is not even working to allow me diagnose or type anything on the console ?
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Sikhumbuzo NtsadaIT AdministrationCommented:
You could try booting it up with out networking and watch post and see what fails.
If it logs in you then put networking back and restart services.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
We've seen this issue before, because the iSCSI initiator is polling the LUN/datastores, and until it timesout, will pause.

Once it's started up, remove the LUNs/datastores.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Santasi and hanccocka, in the data center, we do not have any NAS or iSCSI device, only FC-SAN EMC Clariion array.
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andyalderSaggar maker's bottom knockerCommented:
You did have NAS/iSCSI previously though, didn't you?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
iSCSI, NAS or FC, all will pause the boot of a ESXi/ESX server, if you have not dismounted the datastores correctly.
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andyalderSaggar maker's bottom knockerCommented:
...Even if no longer connected (which looks to be what's confusing the asker).
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Andy, in this ESX host and same with the rest of the other host in this data center there was no iSCSI or NAS data store only FC presented LUNs.

So after waiting more than 24 hrs I can see that it is now progressing.

After I was able to insert the ESXi 5.1u1 ISO image, it is now has been forced migrate to ESXi

Loading
But somehow it is still stuck in the same stage as follows after upgraded successfully to ESXi 5.1u1

same stuck
I thought that this is not the case ?
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Senior IT System EngineerIT ProfessionalAuthor Commented:
what should I do to prevent the ESXi reboot comes smoothly without waiting long time ?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Unmount or Mask the LUNs (datastores) have been removed.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
how to do that ?
because from the existing ESXi, I couldn't see it anymore ?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Have you removed the WWNN of the FC HBAs from the SAN for this host?
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Senior IT System EngineerIT ProfessionalAuthor Commented:
hanccocka, when I remove / unpresent the LUN to the upgraded ESXi host, I can do it from the EMC Unisphere level but then I won't be able todo mass ESX to ESXi migration since this must be done individually per Host ?
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