[CentOS] hard drive question - WD red

m.roth at 5-cent.us m.roth at 5-cent.us
Mon Apr 22 20:48:14 UTC 2013


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




More information about the CentOS mailing list