Hello,
This is due to DRS being a requirement to have resource pools in the first place.
You can of course snapshot and revert them to avoid their loss, disabling DRS in Web Client will prompt you to do this when attempting to disable:
kb.vmware.com/kb/2032893
Bob
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You can retain the resource pool from webclient when disabling DRS
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Best Regards,
Deepak Koshal
CNE|CLA|CWMA|VCP4|VCP5|CCAH