[Discuss] raid issues

[Richard Pieri]

On 6/23/2014 9:41 AM, Stephen Adler wrote:
> drives) and are the favorite for data centers. But there's a factor of 3
> difference between the storage capacity and size. so the problem is that

A 24x2.5" storage box takes up three rack units plus one for a server. A
16x3.5" storage box takes up 6-7 units plus one for a server so for the
same space that the 3.5" box uses I can have 48x2.5" disks. 7 units for
48TB of raw capacity vs. 7 units for 96TB raw capacity. That's a factor
of 2 at most and only with very expensive 6TB 3.5" disks. The factor
drops to 1.3 with 4TB 3.5" disks and is even on with 3TB 3.5" disks.

There's the performance gain. Three 2.5" 7200 RPM disks together are
substantially faster than a single 3.5" 15K RPM disk for less power and
less heat which saves money on cooling costs and is good for drive
longevity.


Dell still offers most of their *Vault line with 3.5" options. There are
also plenty of bare chassis out there to build your own.

-- 
Rich P.