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Switch LBA format (sector size) before formatting #3166

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technobirb opened this issue Feb 9, 2025 · 0 comments

technobirb commented Feb 9, 2025 •

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describe the request

Most consumer SSDs ship with 512B emulation by default, even though they support 4k native. Arch installation guide has a tip about checking the optimal logical sector size before partitioning.

# nvme id-ns -H /dev/nvme0n1 | grep "LBA Format"
LBA Format  0 : Metadata Size: 0   bytes - Data Size: 512 bytes - Relative Performance: 0x2 Good (in use)
LBA Format  1 : Metadata Size: 0   bytes - Data Size: 4096 bytes - Relative Performance: 0x1 Better
# nvme format --lbaf=1 /dev/nvme0n1

This also affects the sector size LUKS will use, which can benefit performance. [1] [2]

P.S.
A few NVME SSDs may not support the format command, check with:

# nvme id-ctrl -H /dev/nvme0n1
oacs      : 0x17
  [1:1] : 0x1	Format NVM Supported

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