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 >
