Hi, I also not sure why we don't use power off/on control any more with the SATA/IDE newer devices. Thanks, ranran On Fri, Jul 13, 2018 at 10:48 AM, Ran Shalit <ranshalit@xxxxxxxxx> wrote: > 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
