Re: Building a 1pb volume

[Ian Pilcher]

On 01/09/2013 09:15 AM, [e-mail] wrote:
> I am currently considering some less expensive storage arrays using 4TB
> SAS disks in 5+1 RAID 5 configurations (each array would be responsible
> for 10 such volumes).  This will give me one level of protection.  Then
> I'm going to propose a DR site with a full second set of storage.  That
> will give me a 2nd level of protection.

I'm too lazy to do the math, but a double-failure is probably not that
uncommon with this sort of configuration and drive sizes.  You probably
want to look at RAID-6 at a minimum.