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a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=Wb1JkmetP80A:10 a=GoEa3M9JfhUA:10 a=KwV4qE7swklyai2pZOUA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: rCLFML8hsN0vcdkeYedUPCjrimpbH4Qk X-Proofpoint-ORIG-GUID: rCLFML8hsN0vcdkeYedUPCjrimpbH4Qk X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzIxMDEyNSBTYWx0ZWRfXyg2jszdFzT0O 0qds/okNEmzFzB3R4BjVFLSznsEF40zbQd8NYVecBvvG8l+JuCoMJjCLgLk4WEOervI8ibPHlIe f2se8z124TQNSuNrFeesVdIIbMpL+zqj8qrbXCleHQj1FRfYC0h3fcEVU9Ycqjd8SZftzyNQfvP Tg7lp0fR32ucYpbbZV8G30bG4aOis+bJp41L5rAlITC5GFRkbGhse1Hksfo7q29Dxhj69jAmgIp Z8Y1DTlhNFmUbPgtgo2Gy737CFkC7798gR4AblCbgUbGlQrTmOLvzeFGi7HlMvu1jOym47vC7YK +ybLC35pIIAne6M+zwBlfg/AvaQvkwigZvM1JTuj3bTvzghYzHX0II4TTTCgVDHTxRgtVstgJ0O ZvwlVUuUwt73+sIJpcnyQgOutq1Q2XNxkSq3vNuX7eFTSQfvOBrESqEpttemW0UH6HrQkh7e On 09/07/2025 02:39, Martin K. Petersen wrote: > The intent for io_min was to convey the physical_block_size in the case > of an individual drive. And for it to be set to the stripe chunk size in > stacking scenarios that would otherwise involve read-modify-write (i.e. > RAID5 and RAID6). > > io_opt was meant to communicate the stripe width. Reporting very large > values for io_opt is generally counterproductive since we can't write > multiple gigabytes in a single operation anyway. > > logical <= physical <= io_min <= io_opt <= max_sectors <= max_hw_sectors Does pbs need to be a power-of-2? The block queue limits and splitting code seems to rely on that, but it is not policed AFAICS. The stacking code seems to just want it to be a multiple of lbs, which itself must be a power-of-2. Thanks, John