Messages in this thread | | | Subject | Re: [PATCH 09/14] target/configfs: Expose protection device attributes | From | "Martin K. Petersen" <> | Date | Mon, 13 Jan 2014 15:30:12 -0500 |
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>>>>> "James" == James Bottomley <James.Bottomley@HansenPartnership.com> 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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