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How come HP doesn't tell how much the maximum internal storage of its rack servers.?

In the description it has RAM 192 gb but nothing about the hard drive. How much data can it store. http://www.ht.com.au/part/Y2833-HP-ProLiant-DL165-G7-Opteron-6172-2.1-GHz/detail.hts

Public Comments

1. Because no one knows how big a single hard drive can be a year from now, or even 6 months from now
2. It has 8 2.5" SFF hot-swap bays that support RAID 0, 1, 5, 10, and 50. The maximum usable storage will depend on what drives you use and what RAID level you select. You could put in 8x1TB and make one big RAID 5 array. In that case, you'd have about 6.3TB usable. If you put in 8x750GB in RAID 10, you'd have 2.7TB usable. They don't state the capacity because it changes with drive technology and also depends on how you configure the drives into RAID groups.
3. The detail section list 8 hot swap drive slots. Guess it can handle 8 x Serial ATA-300 / SAS 2.0 drives at whatever the current maximum drive size is. I tend to like to keep drives in separate hardware from the server (SAN storage) but your situation may not match one that I typically encounter.