Hi list!
Currently we have 3 DS14mk4 shelves full of 300GB 3,5" 15K FC drives. All drives are in a single aggregate in three raid groups with two spare disks. Time has come to upgrade capacity in the aggregate and i'm thinking of 3 possible ways: [a] buy another DS14mk4 shelf and continue with 300GB drives - safest way, but most expensive per GB [b] buy another DS14mk4 but use 600GB drives - probably good idea, not so expensive as [a] [c] buy DS2246 with 600GB SAS drives - Probably not a good idea, since drives are different type(in this case 2,5" 10K SAS), but it seems that future will be SAS', it's cheaper per GB and takes less space in rack. As i understand, it is possible to use different drive types in the single aggregate(allthough not recommended), but probably will have some impact on performance.
Right now my first choice would be [b] followed by [a]. If anyone would share his/her thoughts on the matter I would be most grateful.
Thanks, Joosep