Il 16/03/2011 18:38, Phil Stracchino ha scritto:
> On 03/16/11 13:08, Mike Hobbs wrote:
>>    Hello,  I'm currently testing bacula v5.0.3 and so far so good.  One
>> of my issues though, I have a 16 bay Promise Technologies VessJBOD.  How
>> do I get bacula to use all the disks for writing volumes to?
>>
>> I guess the way I envision it working would be, 50gb volumes would be
>> used and when disk1 fills up, bacula switches over to disk2 and starts
>> writing out volumes until that disk is filled, then on to disk3, etc..
>> eventually coming back around and recycling the volumes on disk 1.
>>
>> I'm not sure the above scenario is the best way to go about this, I've
>> read that some people create a "pool" for each drive.  What is the most
>> common practice when setting up a JBOD unit with bacula?  Any
>> suggestions or advice would be appropriated.
>
> That scheme sounds like a bad and overly complex idea, honestly.
> Depending on your data load, I'd use software RAID to make them into a
> single RAID5 or RAID10 volume.  RAID10 would be faster and, if set up
> correctly[1], more redundant; RAID5 is more space-efficient, but slower.
>
>
> [1] There's a right and a wrong way to set up RAID10.  The wrong way is
> to set up two five-disk stripes, then mirror them; lose one disk from
> each stripe, and you're dead in the water.  The right way is to set up
> five mirrored pairs, then stripe the pairs; this will survive multiple
> disk failures as long as you don't lose both disks of any single pair.
>
>

Hi Phil,
     that last sentence sounds a little scary to me: "this will survive 
multiple disk failures *as long as you don't lose both disks of any 
single pair*".
Isn't RAID6 a safer bet ?

Thanks.

Marcello

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