Newly formatted 1.4 TB shared datastore went missing after few days of operation

Hi All,

I’ve just reformatted 1.44 TB LUN from my Dell MD3000i iSCSI SAN this was a Linux Ext3/FS RDM attached into one of my VM in on ESXi02 host, i did the following:
1.      detaching the RDM from the VM
2.      formatting it from the Dell SAN management software
3.      present it to both host of ESXi01 and ESXi02 so that this new LUN can be shared together as VMFS.
4.      Go to any of the ESXi01 or 02 settings and then add this datastore, format it with 8 MB block size and then make it available to both hosts by creating proper naming.

Today suddenly it went missing without no apparent reason or error? I’ve patch both host few days ago and restart both host and the new LUN was still ok yesterday, but today it went missing so I had to reformat it again from the VCenter from Datastores view.

I tried:
1.      Rescan datastore – nothing appears
2.      Refresh the datastore view from both hosts  - nothing appears as well ?
I wonder what was happening before and I couldn’t imagine if those LUN got data in it?
Any kind of comment and suggestion would be greatly appreciated.

Thanks.

Note:
Vcenter Server 4.0 208111
VMware ESXi 4.0 244038

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jjozAsked:
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coolsport00Commented:
So, a rescan of the host's Storage Adapters doesn't cause the LUN/disk to show back up? And, the VM the RDM LUN is connected to doesn't 'see' the disk/volume any longer either? Try removing the LUN from the Storage Group on your SAN (not familiar with Dell...I run EMC CX4-120), delete it from the RAID group, recreate it, re-add it to your Storage Group and try a rescan of your ESXi host Storage Adapters to see if it shows up again. **ONLY do this if you have no data/VMs stored on this LUN**

~coolsport00
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jjozAuthor Commented:
(this is now become a new shared LUN VMFS volume no longer RDM)
yes the suggestion that you mention is what I just did mate, I was lucky enough to spot this problem before i put all of my production DB into this new VMFS volume.

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coolsport00Commented:
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coolsport00Commented:
BTW..I would maybe also try to add this LUN/VMFS datastore to only 1 host at a time to see if it works just with one. If it doesn't work with 1 of them, then we can isolate 1 host having a problem...maybe a cable issue?

~coolsport00
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jjozAuthor Commented:
hm... the cable is not in the equation since the other VM in neighboring LUNs is still OK.

I tried to add the LUNs before in one of the host and then re-add again it failed, then i tried to resignature it failed too, and then i can just format it then it is finally OK ?
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coolsport00Commented:
Hmm...so, is it showing now?
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jjozAuthor Commented:
yes it is now all is OK after reformat of LUN.

But I still don't understand and worry about what just happened :-|
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coolsport00Commented:
I can't give you a solid suggestion as to why that happened, other than what I read in the posts I submitted above. As you know, technology can be "buggy" sometimes...it's what keeps us having a job! :P haha

Keep an eye on it for a couple days or so to see if it happens again.

~coolsport00
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jjozAuthor Commented:
Thanks dude
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