Re: [PATCH 09/14] target/configfs: Expose protection device attributes

[Martin K. Petersen]

>>>>> "James" == James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> writes:

James> I'm intrigued by this: how do you get the extra space, since I
James> heard all the drive vendors were adamant that 520 was it for the
James> current manufacturing processes.

Well, you've been able to get 528-byte sector drives for a long
time. They are used inside arrays that use both PI and internal
metadata.

In any case Type 4 was never intended for 512-byte sectors. The existing
16-bit T10 CRC is pretty useless for 4096-byte blocks so the proposal
was aimed at 4096+16 (but obviously that tidbit is outside of the T10
spec that doesn't mandate block sizes or accompanying PI types).

-- 
Martin K. Petersen	Oracle Linux Engineering
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