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Re: [dm-devel] [PATCH 4/4] Test chunk size against both origin and snapshot sector size



>>>>> "Mikulas" == Mikulas Patocka <mpatocka redhat com> writes:
>> Do you mean something like 512b logical and 4K physical?  Such
>> devices must perform the appropriate r-m-w.  A 4K formatted device
>> will report 4K for both logical and physical (unless the device and
>> format tool allows for physical != logical).
>> 
>> Mike

Mikulas> No, I meant what happens if you format it with 514, 516, etc
Mikulas> physical blocksize. the Linux clearly doesn't support it, so
Mikulas> what will it do with it? I'll try when I finish tests on 4K.

We only support powers of two (except when the drive is formatted with
DIF but even in that case the logical_block_size is a power of two).

-- 
Martin K. Petersen	Oracle Linux Engineering


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