Jeff hello I have a promise cotroller that exports its disks as logical volumes to the OS, and the OS sees them as physical drives . kernel is 2.6.17. I have set a disk manualy to support ncq using a command line tool provided by promise. I have "echo 1 > /sys/block/..../dev/rescan" and the ncq bit did not show in dmesg. queue_depth is set to 32 no matter if ncq is enabled or not. I cannot echo to queue_depth , I get "permision denied" error ( libata faq says i can do that ). How can I tell if the OS knows of this change ? thank you -- Raz - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html