On Fri, Jul 13, 2018 at 10:25 AM, Greg KH <greg@xxxxxxxxx> wrote: > On Fri, Jul 13, 2018 at 09:29:50AM +0300, Ran Shalit wrote: >> Hello, >> >> We have some old system (2.4 kernel) which use hot swap with sata >> (IDE) , but using commands such as: >> hdparm -U 0 >> hdparm -R 0 0x1f0 ... >> >> But in newer system HW&SW we never use these commands when removing >> and inserting sata. > > What do you do instead? > I just mount and unmount partition. In the old system, we manually power the the storage device after instert and (poweroff on remove) , and then used the hdparm register/unregister comands. Without the hdparm commands the device doesn't exist in /dev , i.e. we must do this register/unregister in the old HW &old kernel. >> Why was it used once and why is it not used in newer system ? > > In the 2.4 kernel there was not kernel support for hot-swap devices like > this, so you had to "manually" do it with these types of commands. > >> Is it that newer system do this somehow automatically ? Where ?is it >> done, in SW or HW ? > > How exactly are you swapping your ide drives today? > With newer HW&SW don't do now any hot swapping, just mount/unmount. Seems that insert/remove id done under power (?), I just try to understand why the newer system (HW&SW) don't need to use these commands any more (hdparm). > And the 2.4 kernel was over a decade ago, hopefully you have upgraded > your hardware since then :) > > thanks, > > greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-hotplug" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
