On lun., 2016-01-04 at 22:54 +0100, Sven Eschenberg wrote: > Hi, > > start=4194304 -> assumind this is in 512 byte blocks, the start sector > is aligned to MByte boundary and thus 4k boundary. > > Anyway, if your device only has one partition which is encrypted with > dm-crypt, set it up to start at sector 2048 (which should be default for > parted, fdisk and so on). Pass align-payload 2048 during creation of the > LUKS header, which will give you an MByte boundary and should always be > okay. > > If the kernel still complains, then something else might be going wrong. Right now I have: root@scapa:~# lsblk -o +ALIGNMENT /dev/sdc NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT ALIGNMENT sdc 8:32 0 931.5G 0 disk 0 └─sdc1 8:33 0 931.5G 0 part 512 └─scapa-backup 253:4 0 931.4G 0 crypt /mnt/scapa-backup -1 And: scapa-backup: 0 1953336209 crypt aes-xts-plain64 0000000000000000000000000000000000000000000000000000000000000000 0 8:33 65536 root@scapa:~# fdisk -l /dev/sdc Disk /dev/sdc: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 33553920 bytes Disklabel type: gpt Disk identifier: EBA98857-89BA-4B2C-8366-4A77A527A8E0 Device Start End Sectors Size Type /dev/sdc1 65535 1953467279 1953401745 931.5G Linux filesystem Partition 1 does not start on physical sector boundary. [I'm a bit concerned with that, but since I'm using a GPT and not MBR it might be related] root@scapa:~# gdisk -l /dev/sdc GPT fdisk (gdisk) version 1.0.1 Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Disk /dev/sdc: 1953525168 sectors, 931.5 GiB Logical sector size: 512 bytes Disk identifier (GUID): EBA98857-89BA-4B2C-8366-4A77A527A8E0 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 1953525134 Partitions will be aligned on 8-sector boundaries Total free space is 123356 sectors (60.2 MiB) Number Start (sector) End (sector) Size Code Name 1 65535 1953467279 931.5 GiB 8300 scapa-backup Regards, -- Yves-Alexis
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