15.10: Long boot-time delays trying to find disconnected hot-plugged storage devices

[TJ]

Is there a way to prevent systemd from creating generator targets for hot-plug disks?

Currently it is causing very long delays at boot-time - which are not interruptible by the sys-admin - but I'm not sure at what point systemd decided those hot-plug devices should be added to the boot-time tasks, or how to safely delete them.

There are generator rules added at some stage but I cannot find information on how to safely remove them, or how to prevent them being created.

In this output the device-mapper names prefixed LUKS_HDD_ are the problem:

$ ls -l /var/run/systemd/generator/*
-rw-r--r-- 1 root root 486 Sep 2 11:45 /var/run/systemd/generator/boot.mount
-rw-r--r-- 1 root root 486 Sep 2 11:45 /var/run/systemd/generator/home.mount
-rw-r--r-- 1 root root 294 Sep 2 11:45 /var/run/systemd/generator/-.mount
-rw-r--r-- 1 root root 933 Sep 2 11:45 /var/run/systemd/generator/systemd-cryptsetup@LUKS_BOOT.service
-rw-r--r-- 1 root root 933 Sep 2 11:45 /var/run/systemd/generator/systemd-cryptsetup@LUKS_DATA.service
-rw-r--r-- 1 root root 887 Sep 2 11:45 /var/run/systemd/generator/systemd-cryptsetup@LUKS_HDD_OS.service
-rw-r--r-- 1 root root 887 Sep 2 11:45 /var/run/systemd/generator/systemd-cryptsetup@LUKS_HDD_VM.service
-rw-r--r-- 1 root root 929 Sep 2 11:45 /var/run/systemd/generator/systemd-cryptsetup@LUKS_OS.service
-rw-r--r-- 1 root root 491 Sep 2 11:45 /var/run/systemd/generator/usr-local.mount
-rw-r--r-- 1 root root 485 Sep 2 11:45 /var/run/systemd/generator/var.mount

[Martin Pitt (pitti)]

You should be able to add the "noauto" option to the devices in /etc/crypttab which you don't rely on for booting.

[Launchpad Janitor (janitor)]

[Expired for systemd (Ubuntu) because there has been no activity for 60 days.]