On Tue, 2013-07-09 at 15:49 +0100, [email protected] wrote: > On Tue, 9 Jul 2013, Pete Smith wrote: > > > Even more mental ... anyone using green drives in their lowest HD tier? > > > > I've used them in a Nexsan with MAID capability, for nearline, and > > they were fine for this purpose, but I wouldn't expect them to sit > > happily in GPFS. > > > > Happy to be confirmed wrong in my suspicions. > > > > By "green" - do you mean the 5400rpm drives? Or something else > (spin-down?)? > > If 5400rpm - I can't think of a reason they wouldn't perform to > expectations in GPFS. Naturally, you'd want to keep your metadata off them > - and use them for sequential activity if possible (put large files on > them). >
You also I think need to make sure you are using "enterprise" versions of such drives. However I don't believe there are "enterprise" versions of the 5400rpm drive variants, therefore using them would be in my personal experience as dum as hell. Another point to bear in mind is you will save a lot less power than you might imagine. For example a Seagate Desktop HDD.15 4TB drive is 7.5W read/write, 5W idle and the name gives it away. While a Seagate Constellation ES.3 4TB drive is 11.3W read/write and 6.7W idle and enterprise rated. To make those numbers more meaningful for ~90TB or usable disk space doing three RAID6's of 8D+2P you will save ~120W. Is that really worth it? JAB. -- Jonathan A. Buzzard Email: jonathan (at) buzzard.me.uk Fife, United Kingdom. _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at gpfsug.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss
