John R Pierce wrote:
> On 4/22/2013 1:18 PM, Tom Bishop wrote:
>> Sure but if you read WD on documentation on at least parity RAID
>> requirements, that specify URE 10^15, and these list out to 10^14. If
>> you are going to run RAID 5 or 6 with the 3gb disks, sounds like that
might
>> not be the best situation but something to think about.
>
> dont put more than 10-12 disks in a single raid stripe and allow at
> least 10% hot spares. my monster raids built from 3TB SATA drives
> rebuild from a single drive failure in about 12 hours, and have 2 spares
> online, so it would take 3 drive failures in less than 12 hours to take
> the file system down. never rely on cold spares in storage, they won't
> be there 3 years from now when you need them, and every hour the spare
> isn't replaced, is another hour added to the rebuild time leaving you
> open to more fail.
That's not a problem the Big Honkin' RAID boxes we have, we bought with
drives. As I said to Tom, these will be used for backups, or honkin' big
datasets, or maybe home directories (which are sometimes the same as
HBDs).
mark