Ubuntu 18.04: Slow boot problem when using LVM

Table of Contents

1 Slow boot problem when using LVM

systemd-analyze shows that kernel boot time takes a lot of time.

$ systemd-analyzeStartup finished in 34.003s (kernel) + 1.843s (userspace) = 35.847sgraphical.target reached after 1.822s in userspac

The wait-for-root in /usr/share/initramfs-tools/scripts/local times out after expiring 30 seconds (slumber value).

local_device_setup(){<snip> case “$dev_id” in UUID=*|LABEL=*|/dev/*) FSTYPE=$( wait-for-root “$dev_id” $slumber ) ;; *) wait_for_udev 10 ;; esac

The dev_id variable is assigned the value of RESUME which is defined at /etc/initramfs-tools/conf.d/resume. This UUID which is assigned to RESUME is the UUID of LVM swap partition.

$ cat /etc/initramfs-tools/conf.d/resumeRESUME=UUID=67b3fe6f-1ec4-413f-8c5a-1136bc7f3270

2 Avoid slow boot problem when using LVM

Assign device file path of LVM swap partition to RESUME and use wait_for_udev instead of wait-for-root. This is the same with /etc/initramfs-tools/conf.d/resume in Debian 9.

$ sudo sed -e ‘s/^RESUME=/#RESUME=/g’ -i /etc/initramfs-tools/conf.d/resume$ echo “RESUME=/dev/mapper/ubuntu–vg-swap_1” | sudo tee -a /etc/initramfs-tools/conf.d/resume

Recreate initrd and reboot system.

$ sudo update-initramfs -u$ sudo reboot

Kernel boot time is faster and you can use hibernation.

$ systemd-analyzeStartup finished in 1.920s (kernel) + 2.370s (userspace) = 4.291sgraphical.target reached after 2.196s in userspace

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