Laurence, > I am testing this but its not being picked up so I want to know if I > have the kernel command line wrong here. > > scsi_dev_flags=LIO-ORG:thin2:0x80000000 > > What am I doing wrong to pass the BLIST flags. This worked for me: [root@kvm ~]# echo "Linux:scsi_debug:0x80000000" > /proc/scsi/device_info [root@kvm ~]# grep Linux /proc/scsi/device_info 'Linux ' 'scsi_debug ' 0x80000000 [root@kvm ~]# modprobe scsi_debug unmap_max_blocks=10 unmap_max_desc=1 write_same_length=20 lbpws=1 [root@kvm ~]# lsblk -D NAME DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO sda 0 512B 5K 0 (With the caveat that I tweaked scsi_debug to report the UNMAP parameters despite lbpu being 0). -- Martin K. Petersen Oracle Linux Engineering
