Manually regenerating core dump files

I am trying to get the core dump files for VMware support but I am having a hard time. I am trying to follow this KB.

http://kb.vmware.com/selfservice/search.do?cmd=displayKC&externalId=1002769

I ran this
esxcfg-dumppart –t

I got this
naa.600508b100103956595531524f330100:7
The best I can figure the above is this datastore “esx02-local01” or "51b1050b-27757685-6aa9-1cc1de20bdaa"

I changed directory to here.
cd /vmfs/volumes/51b1050b-27757685-6aa9-1cc1de20bdaa/

Then I ran this
esxcfg-dumppart --copy --devname "/vmfs/devices/disks/naa.600508b100103956595531524f330100:7" --zdumpname /vmfs/volumes/esx02-local01/filename.1

And I got this.
Error running command. Unable to copy the dump partition: Couldn't find a valid VMKernel dump file. Dump partition might be uninitialized.

Background Esxi 5.5 U1 HP Build. DL380 G6

Any help would be most appreciated.
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RickEpnetAsked:
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RickEpnetAuthor Commented:
No answer So I want to close this question.

Thanks for the effort.
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Zephyr ICTCloud ArchitectCommented:
Did you try the command with another destination datastore, local or on NFS or something (if one available)?

e.g:

esxcfg-dumppart --copy --devname "/vmfs/devices/disks/naa.600508b100103956595531524f330100:7" --zdumpname /vmfs/volumes/esx02-local02/filename.1

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RickEpnetAuthor Commented:
That is a local datastore.
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Zephyr ICTCloud ArchitectCommented:
Yes, I know, but I just wanted to know if the command works if you use another datastore than the one you used in your command...
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RickEpnetAuthor Commented:
I tried this I got the same message.

esxcfg-dumppart --copy --devname "/vmfs/devices/disks/naa.600508b100103956595531524f330100:7" --zdumpname /vmfs/volumes/esx02-local01/dump.log
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Zephyr ICTCloud ArchitectCommented:
I see no difference in your command? You should check if there's enough room on the datastore you want the log to be saved to, do you have only 1 datastore? You can't save to another one? I'm not saying it's the solution but we need to rule out everything.
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RickEpnetAuthor Commented:
This one was esx02-local01 the first one was esx02-local02
One was 01 the other is 02
There is hundreds of GB on 02 and 30 GB on 01
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Zephyr ICTCloud ArchitectCommented:
Ok, thanks ... Did the ESXi server ever have a Purple Screen before?
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RickEpnetAuthor Commented:
Yes this has happened 2 or 3 times.
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Zephyr ICTCloud ArchitectCommented:
Is this a fresh install or an upgrade?
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Zephyr ICTCloud ArchitectCommented:
The reason I'm asking is because the coredump partition for new installations of ESXi 5.5 and later is 2.5GB, as it was previous 100mb...

So if it's an upgrade it might be an issue with the coredump partition not being big enough...
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RickEpnetAuthor Commented:
The one that has been crashing the most is a clean install.
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RickEpnetAuthor Commented:
Your Answer:
No answer So I want to close this question.

Thanks for the effort.
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