experiences with RAID 6

[David Woyciesjes]

Daniel Carrera wrote:
> Kaiser, Hans wrote:
>> Hello Daniel,
>>
>> RAID6 is a standard!
> 
> RAID6 is a standard in the same way that the OpenDocument Architecture 
> is a standard. Sure, it's clearly defined and documented, but it's not 
> something that a lot of people do in real life. Most RAID systems are 0, 
> 1 and 5 and it's a good idea to stick to those.
> 
>> RAID 6 is a better solution as RAID 5 and RAID 1!
>> Both Systems can only live with 1 defect HDD.
> 
> RAID1 can work with arbitrarily many defect hard disks. Because it's 
> mirrored, if you have 10 disks, you can afford to have 9 of them go bad 
> and still have the system work.
> 
>> RAID 6 can work with 2 defect HDDs!
> 
> Do you, in practice, know how to recover a RAID 6 system with two defect 
> HDDs? RAID 6 is a very non-trivial setup. That's why it's not used much.
> 
>> Therefore it is a good question, if someone has experiences in RAID 6 
>> for HA systems
> 
> I didn't say it was a bad question. I suggested that you stick to things 
> that are common and well tested and asked if you had a compelling reason 
> to not follow the most tested route.
> 
> How many disks do you plan to have? What do you want to use this 
> computer for?
> 
> Cheers,
> Daniel.

	Plus there's the fact that RAID 6 is inefficient with a small number of 
drives. It's 's only good when you have something like 10 drives or more 
you want to put in a RAID setup.

-- 
--- Dave Woyciesjes
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