1 Lun not showing up for 1 VMware Host

Vmware-SAN-Lun.docx
I have 2 esx hosts and vcenter running and have recently configure and connected a dell md3200 san.  From the screen shots attached you will see that I have 3 LUN's setup DISK1 DISK 2 and SQL.  On one host all 3 show up with no issues and are able to be connected to and used for virtual machines.  The other host only DISK2 and SQL show up. On the host where DISK1 is not showing up under summary you can see the disk in Configuration the only difference I see is that when you click the LUN below there is no VMFS partition on that host but it does show up on the other host.  Please let me know if you have any thoughts or if you need any more clarification.  In the md3200 all LUNS are mapped to both hosts and show up without issues.  

Thanks
Cody
faunnabAsked:
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Danny McDanielClinical Systems AnalystCommented:
If you have ESXi, login directly to the host, hit Ctrl-Shift-o and that should bring up the system log viewer.  filter by ' error' (a space and then the word error, so you filter out messages that aren't actually errors) and see if there are any messages about storage.  If the system has been up for awhile, you may have to reboot the host to see what it's logging when it tries to connect to that LUN at boot time.

if you have ESX, go to the service console and review the /var/log/vmkwarning and vmkernel log files.

Alternatively, contact VMware support to get their assistance.  If you just bought the licenses, I believe they only sell new licenses with support so you should have entitlement to their help.
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IanThCommented:
click on the datastores tab for host 1 please
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faunnabAuthor Commented:
Added Datastores Screenshots Datastores.docx
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IanThCommented:
so its the local drive thats got a problem check the vm config and see what the says about the hdd
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faunnabAuthor Commented:
No the drive in question is on the SAN DISK1 Capacity 1.99TB The local drive is just showing that alert because it is near capacity.  There are 2 pages on the first document as well one that shows the first host and another page that shows the other host.
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IanThCommented:
can you re add the lun or not ?
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faunnabAuthor Commented:
Edit last post .... DATA1 not DISK1
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Danny McDanielClinical Systems AnalystCommented:
that red ! on the local disk is just there because it's running out of free space...it's not the cause of this problem.
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faunnabAuthor Commented:
If I try to re add it through vcenter it does not show up.  If I connect directly to the host that its missing from then yes it does show up when clicking add storage.  The only problem there is that when re adding it, it will want me to format the drive, name the drive as if it were brand new never used. When it is still being used on the other host.   I have data on that drive and as I could move it off to another drive I never had to do that with any of the other SAN LUN's so it concerns me as to why I would need to do it on this one.
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Danny McDanielClinical Systems AnalystCommented:
when trying to re-add it, does it show that it's a snapshot'd lun?  http://kb.vmware.com/kb/1015986
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faunnabAuthor Commented:
Not sure how I can tell if it sees it as a snapshot'd lun from this screenshot it doesn't look that way. ADD LUN
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Danny McDanielClinical Systems AnalystCommented:
Nope, the VMFS label field would be populated if it was seeing it as a snapshot LUN.  is the above from when you connected directly to the host or going through the VC?
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faunnabAuthor Commented:
Above is when connected directly.  When going through Vcenter and selecting the host and add storage the LUN does not show up at all as available to add.
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Danny McDanielClinical Systems AnalystCommented:
is this a new setup and install and this lun has never been accessed from this host before?
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faunnabAuthor Commented:
Correct that particular LUN has never been accessed from that host before.  All of the LUNS from the SAN were added at the same time to both hosts this one is just the only one that decided not to show up though.  All other LUNS are working fine.  
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faster4233Commented:
Just a quick thought really.  I had a problem with a Datastore showing.  All it took to fix it was a quick reboot of the host.  Although a Managment service reboot and rescan might do the trick.

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