Use this procedure to resolve path thrashing. Path thrashing occurs on active-passive arrays when two hosts access the LUN through different SPs and, as a result, the LUN is never actually available.

1

Ensure that all hosts sharing the same set of LUNs on the active-passive arrays use the same storage processor.

2

Correct any cabling or masking inconsistencies between different ESX/ESXi hosts and SAN targets so that all HBAs see the same targets.

3

Configure the path to use the Most Recently Used PSP (the default) or VMW_PSP_FIXED_AP.