On 15/06/2012 13:22, Sašo Kiselkov wrote:
> On 06/15/2012 02:14 PM, Hans J Albertsson wrote:
>> I've got my root pool on a mirror on 2 512 byte blocksize disks. I
>> want to move the root pool to two 2 TB disks with 4k blocks. The
>> server only has room for two disks. I do have an esata connector,
>> though, and a suitable external cabinet for connecting one extra disk.
>> How would I go about migrating/expanding the root pool to the
>> larger disks so I can then use the larger disks for booting?
>> I have no extra machine to use.
> Suppose we call the disks like so:
>   A, B: your old 512-block drives
>   X, Y: your new 2TB drives
> The easiest way would be to simply:
> 1) zpool set autoexpand=on rpool
> 2) offline the A drive
> 3) physically replace it with the X drive
> 4) do a "zpool replace" on it and wait for it to resilver

When sector size differs, attaching it is going to fail (at least on fbsd).
You might not get around a send-receive cycle...

> 5) offline the B drive
> 6) physically replace it with the Y drive
> 7) do a "zpool replace" on it and wait for it to resilver
> At this point, you should have a 2TB rpool (thanks to the
> "autoexpand=on" in step 1). Unfortunately, to my knowledge, there is no
> way to convert a bshift=9 pool (512 byte sectors) to a bshift=13 pool
> (4k sectors). Perhaps some great ZFS guru can shed more light on this.
> --
> Saso

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