Package: parted Version: 3.2-24 Severity: normal Dear Maintainer,
Running `parted /dev/sdb mkpart primary 0% 100%` on an 8TB Seagate "Backup Plus Hub" USB3 drive results in a partition which starts at 65535s (33553920B), which is not a multiple of the physical block size (4096B). It also causes parted `parted /dev/sdb mkpart primary 1MiB 100%` to print "Warning: The resulting partition is not properly aligned for best performance." If this partition is used by device-mapper, the kernel will print: device-mapper: table: 254:2: adding target device sdb1 caused an alignment inconsistency: physical_block_size=4096, logical_block_size=512, alignment_offset=0, start=33553920 The drive has the following topology (lsblk -t /dev/sdb): NAME ALIGNMENT MIN-IO OPT-IO PHY-SEC LOG-SEC ROTA SCHED RQ-SIZE RA WSAME sdb 0 4096 33553920 4096 512 1 mq-deadline 60 128 32M Presumably the error occurs because parted is using the optimal_io_size for alignment. Since optimal_io_size is based on USB constraints rather than disk constraints, it does not seem suitable for partition layout. I would suggest ignoring optimal_io_size if it is not a multiple of minimum_io_size, as done by cryptsetup[1]. Alternatively, 33553920 could be ignored specifically, since it seems common for USB disks. This issue has been discussed elsewhere: https://www.saout.de/pipermail/dm-crypt/2016-January/004934.html https://bugzilla.redhat.com/show_bug.cgi?id=1513820 https://unix.stackexchange.com/q/340484 https://linux-blog.anracom.com/2018/12/03/linux-ssd-partition-alignment-problems-with-external-usb-to-sata-controllers-i/ Thanks for considering, Kevin [1]: https://gitlab.com/cryptsetup/cryptsetup/commit/b80278c0 -- System Information: Debian Release: buster/sid APT prefers testing APT policy: (990, 'testing'), (500, 'unstable'), (101, 'experimental') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.20.10 (SMP w/4 CPU cores) Kernel taint flags: TAINT_OOT_MODULE Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8), LANGUAGE=en_US.utf8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages parted depends on: ii libc6 2.28-7 ii libparted2 3.2-24 ii libreadline7 7.0-5 ii libtinfo6 6.1+20181013-2 parted recommends no packages. Versions of packages parted suggests: pn parted-doc <none> -- no debconf information
