On Thu, 2010-02-18 at 15:33 -0500, Rick Thomas wrote: > On Thu, Feb 18, 2010 at 18:02, <[email protected]> wrote: > >> John Holland wrote > >> > >>> You could use a 2.5" HDD. The Momentus has a typical usage > >>> specified @ > >>> 1.5W seek and .7W idle. > >> > >> Thanks for pointing out the low energy consumption of modern 2.5" > >> HDs. > >> Since others mentioned that SD is even less suitable for my > >> purpose, I > >> think I'll go that route. > >> > >> Can anybody recommend a specific model of an external 2.5" drive that > >> works well with a slug under Debian (Lenny armel), preferably USB- > >> powered > >> so I don't need an extra power supply? > >> > >> I've read a lot on nslu2-linux.org about spindown issues with HDs > >> connected to a slug. Since my slug is logging data continuously > >> 24/7, I > >> guess I shouldn't let the HD spin down at all. Is that assumption > >> correct?
On my Thecus N2100 I use laeptop-tools to have the disk spun down almost all time. I also log data with solarpowerlog. (Basically I have a very long commit-time for the system partions, parts of /var/* mounted as a tmpfs or a dedicated memory stick. /tmp is alsow tmpfs .... I can do that because my Thecus is behind an ups. Also I made a small webinterface which allows me to set it into "low power mode", where I stop all services which are not needed when I am not at home.) > >> > >> Regards, Richard > > Sounds like a fun project! Please keep us informed on what you wind > up doing. > > If whatever you use works OK with only USB power, that's great. But > I'd make sure that any external hard-drive at least has the *option* > of external power, incase it turns out that the Slug can't provide > enough to, e.g. spin-up at boot time. > > Of course, external power will probably mean more total power drain > (due to losses in the transformer, etc...) There are trade-offs in > all things. > > Another low-power option would be to use a larger USB-stick (e.g. 8GB) > which will allow the writes to be spread over more memory cells, > increasing the total life of the stick. I once read in some magazin about a kernel filesystem project especially for flash memory (no, not JFFS or other mtd-based type). But I forgot to note the name. (Maybe one of you can enlight me) This way I might be possible to do a more proper wear-leveling... > And yet a third idea: You can rent a few gigabytes of storage "in the > cloud" from places like Amazon.com. Then you could use the cloud- > storage as an energy efficient backup for your log files. > > Whatever you do, frequent backups are always a good idea. > > Enjoy! > > Rick > -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/1266655027.3395.29.ca...@moria
