2009/10/29 Aaron Griffin <aaronmgriffin@xxxxxxxxx>: > On Thu, Oct 29, 2009 at 9:31 AM, Xavier <shiningxc@xxxxxxxxx> wrote: >> On Thu, Oct 29, 2009 at 2:08 PM, Michael Towers <larch42@xxxxxxxxxxxxxx> wrote: >>> When I got a new laptop I investigated this problem a little and found >>> that with hdparm -B 254/255 the temperature went up quite >>> significantly. This may be a freak and I would love to know whether >>> there really is something behind it, but when I used -B 200 the >>> temperature increase was clearly smaller, but the load cycle count did >>> not increase!!! Is this actually at all possible? Does the -B option >>> do something other than only affecting head loading? Does anybody >>> know? >>> >>> In looking through the storage-fixup package data I see that always -B >>> 254 or -B 255 is set, so obviously there is no sign of other, possibly >>> more optimal values there. >>> >> >> That sounds like an interesting concern, you might want to ask >> upstream (= storage-fixup maintainers) about it :) > > Anyone happen to know how often the storage-fixup rules are updated? > My Eee drive isn't listed (mine does NOT have an SSD) so I'm not sure > what the hdparm params should be. > >From what I have read on the topic: There is no static answer to "what it should be". The ammount of times / time unit that a drive should cycle is dependant on temperature and actual drive use. If it's sitting still (the laptop it motionless) in a cool area with nothing at all to do, the drive does not have to cycle. However, if the laptop is in motion (train, car) and the system is hot, cycling the drive can reduce heat output and prevent damage to the drive due to sudden movement. This is why simply setting things to -B 255 or 254 (which disables the feature completely) is not something that should be done without at least informing the user. Through experimentation, I suppose you can find a few values to work with. From the quick glance I took at storage-fixup, it seems to disable the feature completely. Does anybody know if it's more advanced than this or is this the full scope of this script? -- msn: stefan_wilkens@xxxxxxxxxxx e-mail: stefanwilkens@xxxxxxxxx blog: http://www.stefanwilkens.eu/ adres: Lipperkerkstraat 14 7511 DA Enschede
