Messages in this thread | | | Subject | Re: ATA 4 KiB sector issues. | From | "Martin K. Petersen" <> | Date | Mon, 08 Mar 2010 15:19:05 -0500 |
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>>>>> "hpa" == H Peter Anvin <hpa@zytor.com> writes:
hpa> On the flipside, though, there really is very little net benefit to hpa> 4K as opposed to 512 byte logical sectors: the additional protocol hpa> overhead is relatively minimal, and as long as writes are aligned hpa> full blocks, there shouldn't be any additional overhead on either hpa> the OS or the drive side. On the plus side, you get full hpa> compatibility with the existing software stack. The equation hpa> really seems rather simple.
4KB sectors are not a win for anybody except the drive vendors.
There is a push in the industry right now to keep the 512-byte logical blocks forever. The first step would be to report misaligned accesses or accesses that are not a multiple of the physical block size. Second step would be to eventually reject any write that's not a properly aligned multiple of the physical block size.
-- Martin K. Petersen Oracle Linux Engineering
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