Hi all cmd_per_lun is the no. of cmds which can be queued per lun and command queing per HBA and device are different right?what is the main differnce betweeb them then ? I googled but couldn't get much. I went through scsi_debug.c but couldnt make much about it through it. Any pointers and links will be appreciated. Thank you -- play the game -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/