ZFS pool cheating

[Jan Dušátko]

Did you try to send snapshot over network ?
I prepared backup using tar, currently plan to do ZFS snapshot and if there will be possibility to send it over SSH, I can minimize downtime and in the same time check / verify functionality of new pool with the same name

Regards

Jan

-----Original Message-----
From: Trond.Endrestol at fagskolen.gjovik.no [mailto:Trond.Endrestol at fagskolen.gjovik.no] 
Sent: 20. listopadu 2013 19:56
To: Jan Dušátko
Cc: freebsd-hackers at FreeBSD.org
Subject: Re: ZFS pool cheating

On Wed, 20 Nov 2013 17:47+0100, Jan Du?átko wrote:

> Dear,
> Do you someone know method, how can be pool converted from 
> concatenating to regular mirror? By mistake I replaced failed disk in 
> pool using add not replace, which caused me to change pool configuration.
> I looking method allow me to have pool online during whole replacement 
> procedure.
> 
> Regards
> 
> Jan

I'm afraid your only option is something along these lines:

1. Make a recursive snapshot of the entire pool.

2. Send a recursive ZFS stream of the recursive snapshots to another pool, or disk.

Beware of the danger of data loss by having only a single set of snapshots available as you proceed.

3. Destroy the old pool.

4. Recreate the original pool to a mirrored configuration.

5. Transfer the recursive ZFS stream back to the new pool using the zfs receive command.

6. Remove the recursive snapshots, if warranted.

If your able to setup a fresh pair of disks in your server, you might be able to transfer the snapshots to a mirrored pool assigned a temporary name. Then export both the current pool and the temporary pool. Import the temporary pool and rename the pool to the correct name as you import the temp pool.

I guess/hope someone more knowledgeable on ZFS will chime in and correct me.

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