[CentOS] quick question on RAID 1

Sat Aug 13 16:59:48 UTC 2005
ML <mailinglist at mdsservices.com>

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duffmckagan ha scritto:

> On 8/13/05, Ulrik S. Kofod <usk at cybersite.dk> wrote:
> 
>>I have 3 disks that I want to setup in a raid 1, my questions is should I setup the
>>3rd disk as a spare-disk or should I mirror all 3 disks all the time?
>>
>>Will it perform *much* better to only mirror two and have the 3rd as a spare.
>>Is it not safer to mirror all 3 drives all the time ?
>>
>>
> 
> 
> I have seen some RAID -1 setups, but why 3 drives?
> 
> In Raid - 1 Setup, if one drive fails, all others fail.
> So what is the point in using 3 drives in  RAID-1?
> 
> I am not an expert on this. But this is quite interesting.
> Can you clarify this a bit for me please?


with 3 disk you can use a raid 5, 2 disk for data striping with 1 disk
for distributed parity.

if you are a raid's beginner you must read and search document with
google...

just for say, i post one link to adaptec web site (that document
explaine the raid technology)

http://www.adaptec.com/pdfs/ACSP_RAID_Ch4.pdf
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