Date: Mon, 05 Nov 2012 12:28:41 -0600 From: Fox F <fox@cyberfoxfire.com> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-fs@freebsd.org Subject: Re: Convert standalone zpool to RAID1 with data in place Message-ID: <50980559.3050306@cyberfoxfire.com> In-Reply-To: <A5FD9F70AF7149908E6945C3D32CE703@multiplay.co.uk> References: <50955FB1.2070800@cyberfoxfire.com> <CAOjFWZ4duNemmfSez9P7O1ppyBhLs8Bn-2aUX_E6fVq36F7Z0w@mail.gmail.com> <5097FB86.9050008@cyberfoxfire.com> <A5FD9F70AF7149908E6945C3D32CE703@multiplay.co.uk>
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On 11/5/2012 11:53 AM, Steven Hartland wrote:
> ----- Original Message ----- From: "Fox F" <fox@cyberfoxfire.com>
>
>> I did forget one point to have clarified.
>>
>> Forget the striping. Let's just assume two disks, 1 and 2.
>>
>> I only have disk1 on hand. So I create a zpool/zfs with it.
>>
>> # zpool create mypool disk1
>> # zfs create mypool/repository
>>
>> Then some data is put on the zfs. Now, I want to convert mypool to a
>> mirror with disk2, while keeping the data on disk1 intact. Is there a
>> way to do that?
>
> Yes off hand you want "zpool attach mypool disk1 disk2" more details in
> "man zpool"
>
> Regards
> Steve
>
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Alright, I think I got it!
"zpool attach" adds a new device to an existing one as a mirror, whereas
"zpool add" adds it as a stripe.
For example,
# zpool create mypool disk1
I now have a single vdev pool.
# zpool add mypool disk2
I now have a striped two-disk pool.
# zpool attach mypool disk1 disk3
Now, I have the following:
mypool
mirror-0
disk1
disk3
disk2
FINALLY, if I want to add disk4, I would say,
# zpool attach mypool disk2 disk4
which would give
mypool
mirror-0
disk1
disk3
mirror-1
disk2
disk4
Which would give me what I need. So to Freddie, this is exactly what you
recommended, and fortunately will work for my circumstances. I guess
what confused me was how attach vs. add work, and the resulting disk
layout. Now, after some testing on my server, I see how it all works.
Thanks for the education.
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