[CentOS] Infrastructure HELP!

Corey Chandler lists at sequestered.net
Thu Oct 29 19:30:39 UTC 2009


Curt Mills wrote:
> On Thu, 29 Oct 2009, ML wrote:
>
>   
>> My question is about initial setup. The 4 x 1TB drives. How to set
>> this up for I have some protection?
>>
>> RAID 0+1? (striped + mirrored) I would end up with 2TB useable space.
>>
>> RAID 5? so what one is a hot spare? 3TB useable space?
>>
>> What about striping the 4 1TB and mirroring that to a 4 x 1tb External
>> drive enclosure?
>>     
>
> Plan for drives going out but keeping the site operational.  Also
> remember that RAID isn't a backup.
>
> RAID 5 is enticing because you get more usable space out of your
> drives, but you have to be sure you'll only lose one drive at a time
> and can get a replacement drive in there and sync'ed up before you
> lose a 2nd one...  If the drives were made by the same manufacturer
> and were bought at about the same time you might easily lose 2 or
> more, blowing up your array.
>
>   

Right.  The problem with 1TB drives (and really, any modern drive with 
decent capacity) is that you're vulnerable until that array finishes 
rebuilding-- a process that's taking longer and longer.

I'd go with the RAID10 solution that someone previously posited.  By the 
time you outgrow that, you should really plan for a SAN/NAS solution 
anyway...

-- Corey / KB1JWQ


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