Got a bit of a shock a few days ago when one of the disk lights on the standard Drobo I have turned red!
I use the Drobo as my master backup storage for all my ScreenCastsOnline project files (as well as an offsite backup). At least, most of my backups - I don't back up intermediate files that can be re-created to save space. A bit of a false economy which I'm thinking of changing.
Anyhow, back to the red light.
Luckily, it was an indicator that I was running low on space and just a warning that I should replace one of the drives with a drive of a higher capacity. This is one of the major benefits of the Drobo in that you can upgrade seamlessly, just by swapping out a drive and the system will magically expand!
However, when I got the Drobo, I populated it with 4 x 1TB drives giving me a useable storage pool of 2.7 Terabytes. Ok, so just swap out one of the 1TB with a 1.5TB or even 2TB drive then...
Hang on?
If I configure the Capacity Calculator on the Drobo site with 3x1TB and a 1.5TB drive, it still only shows 2.7TB available for data but now 436GB "Reserved for Expansion"
Eh?
OK, so add a second 1.5TB drive in and at that point, the available for data goes up to 3.2TB. So an increase of just 500GB would have cost me £160 with 2 x 1.5TB drives
Let's forget about 1.5TB drives and go with 2TB drives.....
Lets add in a single 2TB drive to the 3x1TB drives = No increase in available for data value
Add in a second 2TB drive = Increases to 3.6 TB available for data giving me an additional 900GB but at a cost of £250 using the cheapest 2TB drives I could find.
Now I'm not knocking Drobo here as the benefits of having such a clever device are manyfold, but I think that the expandability aspect only becomes cost effective if you start with relatively small drives to begin with, or if we get really cheap 4TB drives very soon!
So my solution....
DroboPro baby!
To be continued