Hannes, > during testing we found that there is an issue with dev_loss_tmo and > devices in ALUA transitioning state. What happens is that I/O gets > requeued via BLK_STS_RESOURCE for these devices, so when dev_loss_tmo > triggers the SCSI core cannot flush the request list as I/O is simply > requeued. > > So when the driver is trying to re-establish the device it'll wait for > that last reference to drop in order to re-attach the device, but as > I/O is still outstanding on the (old) device it'll wait for ever. > > Fix this by returning 'BLK_STS_AGAIN' from scsi_dh_alua when the > device is in ALUA transitioning, and also set the 'transitioning' > state when scsi_dh_alua is receiving a sense code, and not only after > scsi_dh_alua successfully received the response to a REPORT TARGET > PORT GROUPS command. It would be good to get this revived/reviewed. Thanks! -- Martin K. Petersen Oracle Linux Engineering
