Blake <blake.ir...@gmail.com> writes:

> I think you will be helped by looking at this document:
>
> <http://www.solarisinternals.com/wiki/index.php/ZFS_Troubleshooting_Guide#ZFS_Root_Pool_Recommendations_and_Requirements>
>
> It addresses many of your questions.
>
> I think the easiest way to back up your OS might be to attach a disk
> to the rpool as a mirror, use 'installgrub' to get the grub boot
> blocks onto the new mirror disk, then detach this disk and put it in
> storage.

Thanks for the pointer... looks like I can confuse myself with this
guide for quite a while ... hehe.

One question springs to mind immediately about attaching a mirror for
backup of the os.

I'm doing this on pc hardware.

I don't know enough yet to understand how zpools repair themselves or
how the parity data really works to recreate missing data.  Or what
might happen if a zpool were mounted with a disk missing.

Imagine I have all hardware controller plugins used up with disks in
various pools. So to install a disk to use for the mirror, something
else will have to be unhooked (I mean manually).

When I boot up to transfer zpool data to the newly added mirror disk,
one or another zpool will be missing a disk.  Is that something that
will cause some kind of big problem?  Or would I be able to do
something so the effected pool did'nt get mounted... or maybe other
choices I have no idea about yet?

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