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Best ZFS Expansion Approach?

post #1 of 5
8/5/12 at 1:16pm
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Right now on my home server I have a 3x2TB RAIDZ1 with 4TB usable space. I have approx. 1TB left to use, so I'm beginning to look at expanding the volume.

My question is this: Should I add another vdev of 3x2TB drives, or simply add drives to the existing vdev? Also, as I'm not sure off the top of my head - can you do a live migration from a RAIDZ1 to a RAIDZ2?

Since this is not uber-critical data (most important thing is the volume holds image backups of all machines in my house. So, while important not the most critical thing in the world) I'm not looking to have the best possible solution of redundancy, but 6 drives does make me uneasy.

So, like I said - looking for suggestions on expanding this ZFS pool. I'd be open to buying up to 3 drives at once for this expansion.
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post #2 of 5
8/5/12 at 1:41pm
I'm not saying it's the optimal solution, but i just grow mine with a 3 raw disk raidz1 each upgrade.
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post #3 of 5
8/5/12 at 2:06pm
Thread Starter 
Quote:
Originally Posted by Plan9 View Post

I'm not saying it's the optimal solution, but i just grow mine with a 3 raw disk raidz1 each upgrade.

I was hoping you'd comment here, Plan9.

That's what I was leaning towards, just wasn't sure if it was particularly better/worse than another approach.
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post #4 of 5
8/7/12 at 11:38pm
Quote:
Originally Posted by TurboTurtle View Post

I was hoping you'd comment here, Plan9.
That's what I was leaning towards, just wasn't sure if it was particularly better/worse than another approach.

Sorry, just spotted this reply.

I just want to stress that I went for the minimal effort plan that guaranteed a redundancy disk. There may be better solutions available for you.

Either way, please update this thread with what method you use(d). I'd love to know smile.gif
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post #5 of 5
8/8/12 at 1:19am
Quote:
Originally Posted by TurboTurtle View Post

My question is this: Should I add another vdev of 3x2TB drives, or simply add drives to the existing vdev? Also, as I'm not sure off the top of my head - can you do a live migration from a RAIDZ1 to a RAIDZ2?

Your vdev drive count is defined at creation, therefor it is set in stone, so you can't expand a vdev. Nor can you convert it to a different redundancy type offline or online.

You have 2 options, add another vdev or backup, recreate the vdev with more disks and restore.
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