[OpenIndiana-discuss] can't mirror these disks

[Daniel Kjar]

This is not good news.  I guess i will do the send and move to the newer 
disk and get another new disk for that mirrored pool.



On 06/28/12 01:02 PM, Jim Klimov wrote:
> 2012-06-28 20:37, Jan Owoc wrote:
>> I wasn't able to find a solution, so I now have a non-mirrored root
>> pool. Does anyone know how to override this sector alignment issue?
>
> Apparently, only by creating a new rpool on the 4KB drive
> and zfs-sending data to it from the 512b drive. The idea
> was discussed in detail a few times in the past few weeks
> on this list and/or on zfs-discuss.
>
> What is strange to me is the news that ZFS would refuse to
> attach a 512b disk as a mirror to a 4KB TLVDEV (the rpool).
> I did not test this myself, but it sounds like a bug - a
> 512b disk should certainly receive 4KB writes safely and
> quickly (the opposite is not necessarily true) ;)
>
> Did you certainly test that it doesn't work? If so - I think
> some noise is due on the lists ;)
>
> Also, for a bit more safety against data corruptions on a
> single-disk rpool, you might want to use "copies=2" (or =3)
> and rewrite the data to the pool (i.e. zfs-send|zfs-recv
> within the pool) - in this case the userdata blocks would
> be cloned like metadata is, and corruption (or mis-read)
> of a single sector would not cause big problems.
> Saved me on my home NAS quite a few times - nearly every
> scrub finds a few CKSUM errors on the old root disk :)
>
> HTH,
> //Jim Klimov
>
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-- 
Dr. Daniel Kjar
Assistant Professor of Biology
Division of Mathematics and Natural Sciences
Elmira College
1 Park Place
Elmira, NY 14901
607-735-1826
http://faculty.elmira.edu/dkjar

"...humans send their young men to war; ants send their old ladies"
	-E. O. Wilson