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VMware upgrade - datastores disconnection

Hi,

I'm preparing to do an upgrade in place from ESXi 3.5 to ESXi 4.0. The data stores are located on SAN. Some people (in this forum) mention disconnecting the datastores physically from the host and then readding them after the upgrade process. Official VMware upgrade guides don't mention that at all. Is it a good precaution? Has any of the experts done it? Is it as simple as unplugging the iSCSI cables from the host?

Kind Regards
kiilaa
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kiilaa
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kiilaa
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
It is just a good precaution, because some VMware Admins, install ESXi on the SAN LUNs, erasing the datastore!

Yes, that's correct just remove the Fibre Cables or iSCSI Ethernet cables from the host server.

I would also recommend installing ESXi onto USB/SD card if it's supported in your server.

Here is the VMware KB on installing 4.1 on USB/SD:
http://kb.vmware.com/kb/1020655
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coolsport00Commented:
It is a good precaution to do so. I personally don't do an upgrade, but a full blown reinstall, just because I like "clean" installs. The only downside to that is reconfiguring everything, but if you just document your configs (and, depending on the size of your environment, may not be that much at all), it's only another 10mins post-ESXi install. (8mins for the ESXi install itself).

Just disconnect your SAN Fibre or iSCSI cables, as mentioned, then do your reinstall and/or upgrade.

~coolsport00
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kiilaaAuthor Commented:
Thank you very much for your answers.

All the best
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