Re: UAS error optimal I/O size is obscene

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On 26.03.23 15:39, Stephen Samuel wrote:
Disk /dev/sdc: 74.52 GiB, 80000000000 bytes, 156250000 sectors
Disk model:
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 4096 bytes / *33553920* bytes
Disklabel type: dos
Disk identifier: 0xb66b1d61

33553920 comes to 65535 512 byte sectors. I believe that there is an attempt to assign -1 to  what ends up being a 16 bit unsigned.  This number breaks things.
assigning zero instead of -1 would be consistent with what happens when UAS is disabled.

Hi,

that's plausible, but we need to know why that happens.
Please provide the full dmesg.

	Regards
		Oliver




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