Fixed:The ESX Server always used the preferred path to the disk when that path is available. If it cannot access the disk through the preffered path, then it tries the alternate paths. Fixed is the default for active/active devices.
MRU (Most Recently Used): The ESX Server use the most recent path to the disk until the path becomes unavailable. This is, the ESX Server does not automatically revert back to the original path. MRU is the default policy for active/passive storage devices and is required for those devices.
Manually changing between them is not recommended. The policy is set to what is required.
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