RAID 1 vs RAID 0

Mujkanovic

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What is the difference between RAID 1 and RAID 0?

I got this answer from one of my web hosting providers when I am asking about my SSD disk.

Dear Client,

It is correct that two drives are installed, but there is a difference between usable space depending on the configured installation.

When you automatically install the server using the Linux tab, a software RAID 1 is used. This means that the data is written on both drives at the same time. If one drive fails the server will still work and you can access your data.

If you want to use a different configuration you need to install the operating system manually using the installimage script.

Please keep in mind that a RAID 0 is not recommended in a server environment. If one drive fails all your data is gone!
Is that correct? any comments?
 

Require

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RAID 10 more newer but more expensive but you wanted better performance go for RAID 1 or RAID 5 parity is added to it I am doing a my A+ test soon so this post really got me thinking thanks :)

They are correct!
 

WSCallum

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Best answer
Yes that's absolutely correct. RAID 1 is a mirror and requires at least 2 drives, so as they mentioned if one drive fails you're still online with the other drive still functional, as a result you also see increased performance as data is read from either of the 2 drives. RAID 1 is however limiting in that you can only use 50% capacity of your drives (or 100% of a single drive), for example if you have 2 x 2TB disks you get 2TB usable capacity.

RAID 0 stripes data - So same as RAID 1 it offers a performance boost as data is stored on both drives, there is no mirroring so you get the full usable space of both disks (2 x 2TB would get 4TB usable on RAID 0). However again what they said is correct, if one of the drives fails under RAID 0, you lose all data on that server.
 

ITivan80

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RAID 1 is most ideal in this case. It offers a more stable environment.
 
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