ESXi 5.1 unable to see datastores

Hi all, an unusual problem has occurred whereby a newly installed ESXi host froze and on rebooting the host the the VI client couldnt connect and all datastores werent showing. The esx.conf.LOCK  had to be deleted to log back in to the VI client but still no datastores. Any ideas?
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cwstad2Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
The ESXi installer will prompt you not to overwrite a VMFS datastore if it finds one.

If it says nothing on installation ABORT!!!
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Are these local or remote (shared storage datastores) ?
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cwstad2Author Commented:
Hi Andrew, local storage. The storage sensor  is showing as unconfigured good
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Mr TorturSystem EngineerCommented:
Hi,
according that it is really pretty fast to install ESXi, did you try to reinstall once ?
Did you use a ESXi custom iso image for your specific hardware? (hp, dell, cisco, etc...)
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cwstad2Author Commented:
Hi yes its a specific iso for IBM. I havent tried to resinsatll as i dont want to affect the VMFS datastores
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Mr TorturSystem EngineerCommented:
If you want to be sure and if you are onsite you can disconnect the attachment between the ESXi and San (iSCSI or FC) during the installation.
Then when installation is finished and your new ESXi has booted completly you can connect again your storage. This way you will be sure that VMFS datastores are not overwriten.
Nevertheless, I install ESXi quite regularly since a few years and I agree with Andrew Hancock the installer must prompt you if it detects existing datastores (just after choosing the partition where you want to install ESXi).
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cwstad2Author Commented:
hi guys looks like its the iSCSI software adapter thats the issue.  Every time its added the host hangs, and when rebooted the datastores go offline. Have you heard of this before
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
if you are not running the latest version of ESXi 5.1 - yes!
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cwstad2Author Commented:
Hi Andrew it's the IBM custom 5.1 update 2
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
That's old, that's about Build 1483097, the latest is 2000251.

I would update to Build 2000251, and check if you can reproduce the issue.

Lots of iSCSI issues with 5.1
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cwstad2Author Commented:
Thank you
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