Hi Milan, No, TLR only take effects when there are transport layer errors(lost frame), the protocol will retransmit the lost frame automatically to recover. It has no side effects when there is no error occurs.
So that's a value-add feature and there is no reason to disable it if both HBA and Tape support it. Best Regards Jianfei Wang Milan Jurik wrote: > Hi, > > Jianfei Wang p??e v ?t 27. 08. 2009 v 18:29 +0800: > [...] > >>> 2) As I'm not one of the people familiar with TLR, I'd like to better >>> understand what this does to failure modes. Specifically, what does >>> TLR do when a SCSI error is encountered? Can it lead to an >>> "interminable" hang-like condition where the transport driver >>> continues retrying a failed SCSI command indefinitely? >>> >> How the retransmission happen are specified in the TLR documents >> (SAS1R10 and SAS2R16). This transmission is handled in the firmware of >> the HBA and tape device, according to the SAS specification, not in the >> HBA driver or the target driver. That's why this document focuses on the >> negotiation process. Once the negotiation is done, everything else is >> performed through the firmware. >> > > Any documented way to disable negotiation of this feature by > administrator? > > Best regards, > > Milan > >
