rhel7, systemd: system boot fails frequently due to time-out of device units for boot disks
Issue
System boot fails frequently due to time-out of device units for boot disks if the boot disks are written by by-id symlink in /etc/fstab file. The example of /etc/fstab is as follows:
/dev/disk/by-id/scsi-3<id>-part2 /boot ext4 defaults 1 2
<snip>
/dev/disk/by-id/scsi-3<id>-part1 /path2/log ext4 defaults 1 2
In a reproducer, the issue is seen 8 of 10 times.
Environment
- Red Hat Enterprise Linux (RHEL) 7, minor versions <7.7
- systemd, versions before systemd-219-67.el7
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