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RAID with 4 disks???

By dataproc ·
What is the correct configuration to mirror when using 4 SCSI drives with Harware RAID?
Would it be mirror drive 1 onto drive 2 and drive 3 onto drive 4? OR, Should it be drive 1 mirror onto drive 3 and drive 2 mirror onto drive 4. Thanks for any assistance!

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RAID with 4 disks???

by Kevin Anderson In reply to RAID with 4 disks???

It doesn't matter. If you have 2 disks you want to mirror, you need 2 blanks. Any blank disk can be a mirror for one with data. Either situation you've described would work.

I'll suggest though that if you have a mediocre RAID card, you'll probablly find that it has 2 channels. If it does, you're probablly better off going with duplexing, where drive 1 & 2 are on one SCSI port, and the mirrors, Drives 3&4 are on a different port. That way, either the drive, OR the controler can fail, and you're still up and running.

I certainly think that Mirroring is a better solution that RAID 5, but it's far more expensive, so most people go Raid 5. I'm sort of curious about why you're going with Mirroring/Duplexing rather than Raid 5?

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RAID with 4 disks???

by dataproc In reply to RAID with 4 disks???

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RAID with 4 disks???

by thetechguy In reply to RAID with 4 disks???

it does not matter .both methods u referred works. but duplexing between two channels of the same controller does not help you in case of controller failure.

also raid 10 gives better performance than raid 1 in your case as u have 4 disks.

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RAID with 4 disks???

by dataproc In reply to RAID with 4 disks???

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RAID with 4 disks???

by Joshua1 In reply to RAID with 4 disks???

I would recommend another drive. What I do is mirror my system drives. Then I put whatever the clients will be accessing (DB, App, File Storage) on a RAID 5 array. That provides fault tolerance for both the system and the data drives, while providing the fastest performance to the data array.

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RAID with 4 disks???

by dataproc In reply to RAID with 4 disks???

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RAID with 4 disks???

by dataproc In reply to RAID with 4 disks???

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