Re: [PATCH][RFC]ext4 on 4k-sector drives without read-modify-write support

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>>>>> "Jeff" == Jeff Moyer <jmoyer@xxxxxxxxxx> writes:

>> I have a proposal about 4k-sector hard drives support in fs drivers.
>> Toshiba MK1231GAL is an 1.8" LIF IDE drive. It has 4096-byte physical
>> and 512-byte logical sectors [1]. Unlike others drives with Advanced
>> Format, it has not read-modify-write logic, so it can only operate
>> with 4k blocks. Fortunately some filesystems in linux (I tested jfs,

Jeff> Then it should report a logical block size of 4k.  You have a
Jeff> drive with broken firmware.

Several vendors are contemplating something similar.

I.e. keep the 512-byte addressing to avoid implementing support for 4KB
logical blocks in the OS ATA stack. But the drive will reject I/Os that
are not naturally aligned multiples of 4KB.

I agree it's totally broken. But I suspect we'll be seeing more of
these... :(

-- 
Martin K. Petersen	Oracle Linux Engineering
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