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Irecently asked a question about the best way to apply 20 2TB drives in a ZFS pool. I have come up with the following setup (thanks to many helpful suggestions) and would love opinions and suggestions about what I may have missed.

I have two SATA controllers (controller1 & controller2) that have the following disks attached:

  • controller
    • disk1
    • disk3
    • disk5
    • disk7
    • spare1
  • controller2
    • disk2
    • disk4
    • disk6
    • disk8
    • spare2

My thought was to create the pool using mirror pairs of disks, one disk each from each controller; ie:

  • mirror1: disk1 & disk2
  • mirror2: disk3 & disk4, etc

The two spare drives would give me some redundancy and also having the mirrors made up of disks from each controller should give me some redundancy as well.

Have I missed anything? Ii feel like I can grow the pool with little fuss by adding mirrored pairs and also more redundancy by added spare pairs.

I feel like this would give me a good balance of speed and redundacy.

Thoughts welcome and appreciated.

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2 Answers

That works just fine. Yes, you definitely want your mirrored disks to be distributed across controllers. That way, you could sustain a controller failure. You haven't missed anything there.

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My only fear with this setup is the amount of bandwidth that the controllers can handle seeing as you will have X amount of mirrors across the controller.

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