Thursday, May 31, 2007

PDO remove period in MPIO DDK

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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