New Drive - Not sure how to change my setup

[therealpure]

Hey,

Currently I have:
2 x 1tb drives Mirrored = vol1 (SMART failure was shown so I want to replace these)
2 x 2tb drives Mirrored = vol2

I now just got a 1 x3 tb drive.

My jails are installed on Vol1.

What is the best setup for my new configuration?

• Add the 3tb to the ZFS vol2? This can't be undone (correct?)
• Make a new vol for the 3tb to be separate?

Also how would I restore the jails from the 2 x 1tb Vol1 ? If I make a snap shot of these jails, remove drives and then "restore" this snapshot to the new drive?

Many thanks for any help

 

[danb35]

Are both of your 1 TB disks failing, or only one? If just one is failing, replace it with the 3 TB disks. At some point in the future, replace the other 1 TB disk with a 3 TB disks, and at that time, vol1 will grow to ~ 3 TB.

 

[therealpure]

Thanks for quick reply.

If I replace 1 of the 1tb drives will that not limit the mirrored volume to be only 1tb? Despite having a 1 x 1tb and 1 x 3tb drive?

Are both of your 1 TB disks failing, or only one? If just one is failing, replace it with the 3 TB disks. At some point in the future, replace the other 1 TB disk with a 3 TB disks, and at that time, vol1 will grow to ~ 3 TB.

 

[danb35]

Yes, that's correct. A ZFS mirror with 1 x 1 TB disk and 1 x 3 TB disk will have a capacity of ~ 1 TB. When you replace the other disk, its capacity will increase.

 

[therealpure]

But by inserting 1x3tb drive first then the data should be mirrored on to this and then replacing the remaining 1x1tb drive I will keep all the data/jails but end up with 3tb of mirrored storage.

Once I swap in the 3tb drive is there anything I will need to do to ensure the mirror works with this?

Should I just follow the "replace a broken drive" advice here

http://doc.freenas.org/9.3/freenas_storage.html#replacing-a-failed-drive

Yes, that's correct. A ZFS mirror with 1 x 1 TB disk and 1 x 3 TB disk will have a capacity of ~ 1 TB. When you replace the other disk, its capacity will increase.