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Removing datastores from esx clusters

Posted on 2014-02-21
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Last Modified: 2014-03-01
I'm working in a large enviroment where hundreds of datastores will be changed due to SAN units being replaced. After all VMs have been migrated to new datastores on the new SAN, is there any harm in just removing the zoning  on the SAN switcheds and doing a rescan? These are HPDL380 series servers attached to EMC vmax.

I'm familiar with the KB below which talks about dismounting and detaching but I'm wondering if it' even necessary in my situation. We regularly change masking views on the storage for the purpose of migrating from one cluster to another and after, when the masking views are removed, there's no impact to the servers.

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2004605
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Question by:LN41
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 39877669
Make sure the LUNs are masked/unnounted first from ESXi, because if an ESXi server expects to see a LUN, which has not been unmounted correctly, it can cause the ESXi server to poll the datastore forever, causing vCenter disconnections, and general un-responsive behaviour of a host. (same applies for FC and iSCSI).
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