On Fri, 2008-09-19 at 11:50 +0200, Elias Oltmanns wrote: > [ For some reason your email has not shown up on linux-ide. ] yes. I noticed too. > "Raz Ben-Yehuda" <razb@xxxxxxxxxxx> wrote: > > Elias > > looks very interesting. > > 1. How will it impact VM , swappers , raids ? > > What exactly do you want to know? As long as the disk is parked, you can > do no I/O on it, i.e. no swapping is possible. Since I don't know > anything about the implementation of raids and don't have a raid setup > here, I can't really tell how a raid device will behave exactly when one > of its disks has been parked. Generally, all I/O will be delayed until > the disk is unparked again. > > 2. you said it has no value for servers ? did you try ? > > Again, I'm not quite sure what you want to know. Obviously, desktops or > servers for that matter can have disks installed that support the unload > feature. On these devices you can use the interface as described in my > document. All I'm saying is that the interface has been designed with > laptops in mind because I don't see in which situation immediate head > unloading would be required or even desirable in a classical server > environment. I will rephrase. does head parking increase reliability ( MTBF ... MTTF ) of a disk ? My servers hardly generate IOs at night times, does head parking at nights extend the life of a disk ? or is it the opposite ? does it matter ? thank you again raz > Regards, > > Elias -- 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
