On 01/02/2014 05:56 PM, Carsten Aulbert wrote:
Hi
sorry late in joining the thread
Hey Carsten, good to see you here!
On 01/02/2014 11:42 PM, Stan Hoeppner wrote:
Damn, you had me salivating Joe. These are both AF 512e drives, not
native 4K.
and many others.
I've not yet seen an announcement from anyone. I'm not all seeing, but
I'd think such an announcement would cross my RADAR.
Just look around:
http://www.wdc.com/wdproducts/library/SpecSheet/ENG/2879-771475.pdf
and then the FAQ about "Advanced Format":
https://wdc.custhelp.com/app/answers/detail/a_id/5655
Why would one need to align to 4k if the on disk layout would be 512bytes?
Or did I miss something?
If you align to a 1k size (2x 512 byte emulated sectors), then you will
be offset from the start of the real 4k sector. As you can see from the
WD document, advanced format drives are 4k with a 512byte translation
layer. They are there specifically to provide backwards compatibility
for old OSes. For best performance, they recommend using the units in
their native 4k format.
But they are 4k native and you can use them that way. The 512 byte
layer is emulated.
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
