I was trying to create dm-crypt target from a partition using the following command:
dmsetup create target_name --table "1 $DEV_SZ crypt aes-xts-plain64 abababab...ab 0 /dev/sdb1 0"
where $DEV_SZ is the total sector count of /dev/sdb1 minus 1. In other words, I want the DM to just skip the first sector on /dev/sdb1 (as I want to use that sector of sdb1 for a different purpose).
However, I got error:
device-mapper: table: 253:0: crypt: Gap in table
device-mapper: ioctl: error adding target to table
Is it possible for the device mapper to skip the first sector, or it simply always has to start at 0?
Thanks
Lukas
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