On Tue, 2008-03-04 at 10:40 -0700, Hagan, Steve wrote: > Windows (StorPort drivers) supports LUN, target, and bus resets in a > hierarchical fashion. If an I/O times out, Storport will issue a LUN > reset first. If that fails, it will escalate to a target reset. If > that fails, it will escalate to a bus reset. > > What does "fail" mean? Fail means the driver was unable to perform the action. i.e failure of a LUN reset means we couldn't get the TMF out. > If the TM request returns with a non-success > status, or if there are outstanding I/O's for the scope of the reset > remaining after we receive the TM reply, then the reset is considered > failed. Outstanding I/O is a dubious point. Your driver could have outstanding I/O for the LUN after a LUN reset, but if the device correctly executed it, it will have cleared its queue. > Our miniport driver will return error status back to Storport > and it will escalate to the next level of reset. A bus reset cannot be > failed back to Storport. If a bus reset fails (as above) then the only > recourse if for the miniport to do a hard reset of the adapter and > return all outstanding I/O's with reset status. That's pretty much what the default error handler does. James -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
