You should be able to add the "noauto" option to the devices in
/etc/crypttab which you don't rely on for booting.
** Changed in: systemd (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1491393
Title:
15.10: Long boot-time delays trying to find disconnected hot-plugged
storage devices
Status in systemd package in Ubuntu:
Incomplete
Bug description:
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
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