Yes, I have rebooted many times. Right now, I'm using them in a working system. What's more, I have two systems prepared similarly, one with raid and one without, and they are showing exactly the same problem. Here, have a look at one of these systems (raid). All the disks sd{a,b,c} are random filled with no luks header. They are mounted with an external header. sd{a,b} contain root/home and sdc (not mounted) is just data. @Tyan-S2927:~$ ls -l /dev/disk/by-id/wwn-* lrwxrwxrwx 1 root root 9 Jan 14 11:16 /dev/disk/by-id/wwn-0x50014ee207XXXXXX -> ../../sdb lrwxrwxrwx 1 root root 9 Jan 14 11:16 /dev/disk/by-id/wwn-0x50014ee208XXXXXX -> ../../sdc lrwxrwxrwx 1 root root 10 Jan 14 11:16 /dev/disk/by-id/wwn-0x50014ee208XXXXXX-part2 -> ../../sdc2 lrwxrwxrwx 1 root root 10 Jan 14 11:16 /dev/disk/by-id/wwn-0x50014ee208XXXXXX-part3 -> ../../sdc3 lrwxrwxrwx 1 root root 10 Jan 14 11:16 /dev/disk/by-id/wwn-0x50014ee208XXXXXX-part4 -> ../../sdc4 lrwxrwxrwx 1 root root 9 Jan 14 11:16 /dev/disk/by-id/wwn-0x50014ee25XXXXXX -> ../../sda lrwxrwxrwx 1 root root 10 Jan 14 11:16 /dev/disk/by-id/wwn-0x50014ee25XXXXXX-part2 -> ../../sda2 @Tyan-S2927:~$ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 1.8T 0 disk ├─sda2 8:2 0 1.6T 0 part └─luks.root1 252:0 0 1.8T 0 crypt /home sdb 8:16 0 1.8T 0 disk └─luks.root2 252:1 0 1.8T 0 crypt sdc 8:32 0 1.8T 0 disk ├─sdc2 8:34 0 499.7G 0 part ├─sdc3 8:35 0 1000.3G 0 part └─sdc4 8:36 0 130.7G 0 part sdd 8:48 1 28.9G 0 disk └─sdd1 8:49 1 28.9G 0 part /boot @Tyan-S2927:~$ sudo blkid -p /dev/sda @Tyan-S2927:~$ sudo blkid -p /dev/sdb @Tyan-S2927:~$ sudo blkid -p /dev/sdc @Tyan-S2927:~$ mount | column -t sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime) proc on /proc type proc (rw,nosuid,nodev,noexec,relatime) udev on /dev type devtmpfs (rw,nosuid,relatime,size=12326324k,nr_inodes=3081581,mode=755) devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000) tmpfs on /run type tmpfs (rw,nosuid,noexec,relatime,size=2475548k,mode=755) /dev/mapper/luks.root1 on / type btrfs (rw,noatime,nodiratime,compress=lzo,space_cache,autodefrag,subvolid=258,subvol=/@) securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime) tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev) tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k) tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755) cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd) pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime) cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct) cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio) cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset,clone_children) cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices) cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory) cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio) cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event) cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer) cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb) systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=21,pgrp=1,timeout=0,minproto=5,maxproto=5,direct) debugfs on /sys/kernel/debug type debugfs (rw,relatime) mqueue on /dev/mqueue type mqueue (rw,relatime) hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime) fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime) /dev/sdd1 on /boot type btrfs (rw,noatime,nodiratime,ssd_spread,space_cache,subvolid=257,subvol=/@s2927boot) /dev/mapper/luks.root1 on /home type btrfs (rw,noatime,nodiratime,compress=lzo,space_cache,autodefrag,subvolid=259,subvol=/@home) tmpfs on /run/user/120 type tmpfs (rw,nosuid,nodev,relatime,size=2475548k,mode=700,uid=120,gid=127) gvfsd-fuse on /run/user/120/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=120,group_id=127) tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=2475548k,mode=700,uid=1000,gid=1000) gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000)