Erez Boym wrote:
What you are describing boils down to having either stripping or raid-0 between disks 1 and 2, and 3 and 4. Then you will have raid-1 between the first and the second disks.Hi,
I'm planning on building a home server and planning to add RAID to that server for both seamless large HD and backup I have stumbled across a small RAID question:
I'm planning on 4x200G HDDs and I want to set them in such a way that I will have 2 fully mirrored 400G HDDs. Hence to take HD 1 and 2 and create a large 400G out of them, then take HD 3 and 4 and create a large 400G out of them, then have the HD3&4 as a full mirror of HD1&2.
Is that possible?
What type or RAID do I need (0,1,2 .....) ?
Thanks
Erez
However, please consider the following:
1. You did not say what bus your hard-disks are using. If they are IDE, placing two hard disks in raid over the same IDE bus will yield performance penalty. The only practical way to connect four IDE hard-disks in raid is to add two more IDE buses to the two that come standard.
2. If you are going to have 4x200G, why not do one Raid-5 (resulting in 600G useable space), rather than 2xRAID-0+RAID1 (resulting in 400G)?
3. The difference between RAID-0 and stripping is worth reading. If you are going to be locked in to the current disk sizes, then RAID-0 is probably better for you. If there is a chance that you will add more disks, use stripping.
Shachar
-- Shachar Shemesh Lingnu Open Source Consulting ltd. http://www.lingnu.com/
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