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SubjectRe: [PATCH] dm-cache: document zeroing metadata device step
On Mon, Jul 13, 2020 at 03:40:39AM +0800, Austin Chang wrote:
> + # When using dmsetup directly instead of volume manager like lvm2,
> + # the first 4k of the metadata device should be zeroed to indicate
> + # empty metadata.
> + dd if=/dev/zero of=/dev/mapper/metadata bs=4k conv=notrunc

... don't you need 'count=1' or you'll zero the entire device?

> dmsetup create my_cache --table '0 41943040 cache /dev/mapper/metadata \
> /dev/mapper/ssd /dev/mapper/origin 512 1 writeback default 0'
> dmsetup create my_cache --table '0 41943040 cache /dev/mapper/metadata \
> --
> 2.26.2
>

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