>>>>> "Bernd" == Bernd Schubert <bernd.schubert@xxxxxxxxxxxxxxxxxx> writes: Bernd> please correct me if I'm wrong, but I think the code Bernd> optimistically enabled WRITE_SAME for any drive, except of those Bernd> on a sata (libata) controller. Correct. WRITE SAME has been used extensively by RAID manufacturers for years. So pretty much any SCSI-class drive supports it. The headache we ran into in this case was SATA drives behind a SAS controller. Bernd> Martins patch should improve that (I still need to test it on our Bernd> hardware), Please do! James wants a tested-by from someone that's not me before he pushes the patch to Linus. -- Martin K. Petersen Oracle Linux Engineering -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html