Old Barry's at it again with the DMX pitch, this time for VTL.
Here's a quick comparison with Copan's Revolution 220TX system and the specification of the DL6100 from EMC's website.
Copan Revolution 220TX
- Single Cabinet
- 896 drives (500GB SATA)
- Power (max): 6368 watts
- Throughput: 5.2TB/hour
- Capacity: 448TB max
- Emulation: 56 libraries, 56 drives, 8192 virtual cartridges
- 7 cabinets (max configuration)
- 1440 drives (500GB LCFC)
- Power (max): 49100 watts
- Throughput: 6.4TB/hour
- Capacity: 615TB max
- Emulation: 256 libraries, 2048 drives, 128000 virtual cartridges
So, you'd need 1.5 Copan devices to match the EMC kit and yes, it doesn't scale as well in terms of virtual components, but there are some big issues here. For instance, EMC's device isn't green - the power demands are huge and not surprising, as the drives are all spinning all the time (Copan have only 25% max if theirs in use at any time). Floor density is not good in the DMX - why? Because the drives are in use all the time and it is an Enterprise array, so timely replacement of disk failures is important - but less so for a virtual tape system which can tolerate downtime.
So what would you go for? My money would be on a DMX for Enterprise work, which it is great at - and not as a "one size fits all" system, which it quite plainly is not.