Posted 07 October 2012 - 14:47
currently the 3tb from what I have looked is the best bang for the buck $ per GB. This is how I always compare sizes - size / price to get common how many cents per GB.
Raid or not is a big question, with all the non raid ways of creating storage space it is a big question. I am just using drive pool from stablebit currently to allow me to access all the space on all the drives I want as 1 share. Along with multiple copies of my more critical files on more than 1 disk in the storage. This allows me to grow on the fly - just add more disks, or pull out smaller disk and put in bigger one. No need for any special raid controller, and worse case can just put these disks on any computer and access the files on the disk just like normal with normal file names and dir, etc.
If a drive is lost, only have to restore files on that disk that was lost. Combined with smart monitoring of the disk, and the drive scanner from same company - I would hope to get warning of any drive failure (hope too) and just be able to remove files off that disk and move to new one, etc..
With people wanting to store more and more stuff, and being able to expand that on the fly in the home market I would look outside standard raid models for what works for you. Especially with drive costs being as they are -- not sure I want to loose a disk to parity for what I am storing. If I did want parity I would prob go with the unraid type model where there is a specific parity disk and can expand on the fiy with disks as large as the parity disk up to 20 some TB, etc..
edit: So for example as I get closer to needing more space my plan is to replace one of the 750GB with a 3TB and move that 750GB as a datastore for my VMs vs the current 250GB. Cost of upgrade in 2TB + more space the cost of 1 3TB drive. And that is just because I want to upgrade that 250 and reuse one of the 750's. Then next update will prob just add another 3TB drive as some latter date as that 2TB becomes full. Or maybe just swap out the other 750 because its oldest of the disks and more likely to fail before others, etc.