On 12/28/2010 04:41 AM, torn5 wrote:
Hello all, in open-iscsi, when network connectivity is lost, scsi commands that were in-flight at the moment of disconnection are failed to the SCSI layer. These get resubmitted up to 5 times by the SCSI layer (or so is written in the open-iscsi docs) and after that they are held in the queue (device "blocked") until the network connection is restored. Now the question is: when SCSI resubmits commands to a device, I suppose they go to the end of the queue for the device, and not at the head like they were. Am I right?
The request goes to eh head. scsi layer calls blk_requeue_request->elv_requeue_request-> elv_insert(ELEVATOR_INSERT_REQUEUE) and ELEVATOR_INSERT_REQUEUE's case falls through to the ELEVATOR_INSERT_FRONT case.
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