> On Jul 19, 2016, at 1:19 PM, [email protected] wrote:
> 
> Hi,
> 
> the new model is a 2 TB Seagate NAS HDD ST2000VN000 and as to the report it 
> has 4K as physical blocksize:
> dkmp_ext.dki_lbsize   = 512
> dkmp_ext.dki_pbsize   = 4096

Friendly advice: you can force this 512e drive into an existing 512n pool. 
However, you will be
unhappy with the performance of the result. You will be happier with a 512e 
device.

> 
> the other models in the ZRAID are a Seagate ST31500341AS (1,5TB) which 
> reports as 512 and seems just to have 512
> dkmp_ext.dki_lbsize   = 512
> dkmp_ext.dki_pbsize   = 512   
> 
> and the same is reported by the other Western Digital 1TB WD10EADS
> 
> I do not think that there is a way that the old ones will work with 4K, but I 
> hope that the new one will work with 512. And I really hope that someone has 
> the clue how to integrate my new diskdrive before another one dies…

I think you’ve got this backwards?  512n devices work fine with 4k block sizes. 
512e drives perform poorly with 512 byte block sizes.
 — richard

> 
> Mat
> 

--

[email protected]
+1-760-896-4422



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