ZFS: Add disk to single disk pool

[Johan Hendriks]

Patrick schreef:
> On Sat, Feb 1, 2014 at 1:29 PM, Patrick <gibblertron at gmail.com> wrote:
>
>> I set up a 9.2 system following the "RootOnZFS" instructions in the wiki.
>> I have:
>>
>> # zpool status
>>    pool: zroot
>>   state: ONLINE
>>    scan: none requested
>> config:
>>
>>          NAME         STATE     READ WRITE CKSUM
>>          zroot        ONLINE       0     0     0
>>            gpt/disk0  ONLINE       0     0     0
>>
>> I have another disk that I'd like to add to expand the size of the volume,
>> but I'm not sure how to do that.
>>
>> I've prepped the disk with:
>>
>> gpart create -s gpt ada1
>> gpart add -t freebsd-zfs -l disk1 ada1
>>
>> I tried a few different things, but I'm clearly not getting something:
>>
>> # zpool add zroot /dev/gpt/disk1
>>
>> cannot add to 'zroot': root pool can not have multiple vdevs or separate
>> logs
>>
> I found the solution here: http://astralblue.livejournal.com/371755.html
>
> I just had to set bootfs="" temporarily while I added the new disk, and
> then set it back.
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You do know that if one of the disks fail, you loose the whole pool?!
There is no parity to overcome a disk failure in this setup.

regards
Johan