Accidentally extended volume

[spg900ny]

So I guess I was tired or something, but I just finished moving all my data off a failing zpool over to a new 4TB drive. I had another new 4TB drive I was going to mirror to, and somehow I accidentally extended the pool instead. So now I have a nice ~7TB pool with two potential points of failure instead of a protected, mirrored volume.

I haven't written any new data. Is there any recovering from this or do I need to buy yet another 4TB drive to move everything to, destroy the volume, then re-create as intended?

 

[gpsguy]

Sorry, but you will have to back up the data, recreate your pool, and restore your data.

 

[spg900ny]

Ugh. That's what I was afraid of. I just spent a whole weekend doing this and was hoping to be done with it. Thanks.

 

[spg900ny]

This would have been handy: http://blog.delphix.com/alex/2015/01/15/openzfs-device-removal/

 

[danb35]

So you were trying to add a mirror disk through the GUI? That's your problem--you just can't do that. It is possible to do it through the CLI, but not through the GUI at this time.

 

[cyberjock]

So you were trying to add a mirror disk through the GUI? That's your problem--you just can't do that. It is possible to do it through the CLI, but not through the GUI at this time.

You sure can add a mirror. That's what the manual setup options are for in the ZFS volume manager. :P

In fact, situations like this are *exactly* why us more advanced users got out the pitchforks and torches when the new ZFS volume manager limited our ability to do weird things.

 

[danb35]

So you're saying I can have a single-disk pool, and then later add a second disk as a mirror of the first one using the web GUI? How? I just tried it in a VM under 9.3.1, and wasn't able to make this happen. I created a single-disk pool, went back to the volume manager, clicked Manual Setup, chose my pool under "volume to extend", and selected one disk from the "member disks" list. I wasn't given any options about how it would be added to the existing pool, and when I clicked "add volume", it was added as a stripe (so the resulting pool was a two-disk stripe, not a two-disk mirror).

I recall hearing that this feature was supposed to be coming with 9.3, but then it got pulled before release.

 

[cyberjock]

Ahh.. I reread the thread. I thought you were asking how to add a mirrored vdev. Not change a vdev of a single disk to a mirrored vdev.

Sorry. You can ignore what I said above. :P