scaling options for mysql on linux vm (ubuntu) : how to scale when the RAID 0 is out of space
You have to ask yourself the question "How much is my data worth to me/the company?". 

Cheap solution:

You could buy 2 2TB disks to replace the 2 1TB ones you already have. That would be a stop gap IMHO. RAID0 really doesn't cut the mustard these days with bit-rot and 24x7 operation. If one of your disks goes down, you'll place a lot of extra strain on the other disk (possibly provoking its failure - then you're bunched :-( )

More expensive, but worth it (IMHO):

Personally, I'd use a FreeNAS box with RAID-Z also striped and mirrored - or possibly Z-3. If you have the expertise in-house, great, but if not, I'd recommend iXsystems (I am not associated with this company, just have heard good reports from people who work in this area - plus they develop FreeNAS).