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pages.zh/linux/blockdev.md
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pages.zh/linux/blockdev.md
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# blockdev
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> 管理、查询和操作块设备。
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> 更多信息:<https://manned.org/blockdev>。
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- 打印所有设备的报告:
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`sudo blockdev --report`
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- 打印特定设备的报告:
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`sudo blockdev --report {{/dev/sdXY}}`
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- 获取设备的大小(以512字节扇区为单位):
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`sudo blockdev --getsz {{/dev/sdXY}}`
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- 设置为只读:
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`sudo blockdev --setro {{/dev/sdXY}}`
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- 设置为读写:
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`sudo blockdev --setrw {{/dev/sdXY}}`
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- 刷新缓冲区:
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`sudo blockdev --flushbufs {{/dev/sdXY}}`
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- 获取物理块大小:
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`sudo blockdev --getpbsz {{/dev/sdXY}}`
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- 将预读值设置为128个扇区:
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`sudo blockdev --setra 128 {{/dev/sdXY}}`
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