The PDO remove period is used when the last path to the LUN has gone missing and allows the virtual PDO (the one seen by disk) to stick around for a short while. A delay in removing it covers the case where the path comes back quickly (such as a transient condition) and avoids excessive processing time for PnP to scan luns, and rebuild stacks. You want to keep this as short as possible to avoid I/O hangs in the system.
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