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I've got a Debian Jessie system and I'm trying to recover this onto a RAID 1 with LVM.

I've got a RAID1 over two 2TB NVMe drives and my /boot is on a USB booting in Legacy mode to Grub2. That bit works, it's when the kernel tries to mount the /home it times out and I get this error:

 : Dec 12 15:33:34 ltsp systemd[1]: Job dev-mapper-vg\x2dhome.device/start timed out. : Dec 12 15:33:34 ltsp systemd[1]: Timed out waiting for device dev-mapper-vg\x2dhome.device. : -- Subject: Unit dev-mapper-vg\x2dhome.device has failed : -- Defined-By: systemd : -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel : -- : -- Unit dev-mapper-vg\x2dhome.device has failed. : -- : -- The result is timeout. : Dec 12 15:33:34 ltsp systemd[1]: Dependency failed for /home. : -- Subject: Unit home.mount has failed : -- Defined-By: systemd : -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel : -- : -- Unit home.mount has failed. : -- : -- The result is dependency. : Dec 12 15:33:34 ltsp systemd[1]: Dependency failed for Local File Systems. : -- Subject: Unit local-fs.target has failed : -- Defined-By: systemd : -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel : -- : -- Unit local-fs.target has failed. : -- : -- The result is dependency. : Dec 12 15:33:34 ltsp systemd[1]: Triggering OnFailure= dependencies of local-fs.target. : Dec 12 15:33:34 ltsp systemd[1]: Dependency failed for File System Check on /dev/mapper/vg-home. : -- Subject: Unit systemd-fsck@dev-mapper-vg\x2dhome.service has failed : -- Defined-By: systemd : -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel : -- : -- Unit systemd-fsck@dev-mapper-vg\x2dhome.service has failed.

Then I'm dumped at the Emergency Console.

I have checked the UUIDs with blkid and they are the same:

/etc/fstab:

/dev/mapper/vg-root / ext4 noatime,errors=remount-ro 0 1 UUID=d276a0d4-c95f-4792-a222-6d1451899de2 /home ext4 noatime,errors=remount-ro 0 1 UUID=4308b9dd-3319-47f4-b303-1bfdd928c25e /boot ext4 noatime,errors=remount-ro 0 2

Once I put my root password into the Emergency Console I can see that /home is mounted.

Why is it failing whilst booting?

UPDATE

root@ltsp:/# sudo systemctl status dev-mapper-vg\\x2home.device ● dev-mapper-vg\x2home.device Loaded: loaded Active: inactive (dead)
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  • Please add the output of sudo systemctl status dev-mapper-vg\\x2home.device after bootup. Commented Dec 12, 2019 at 17:56

2 Answers 2

Reset to default
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I had the similar problem but didn't find any suitable solution. I only can give some workarounds:

Create unit files for each volume you want to mount. E.g.

[Unit] Description=Start home [Service] Type=oneshot RemainAfterExit=yes ExecStart=/bin/mount /dev/mapper/vg-home ExecStop=/bin/umount /dev/mapper/vg-home [Install] WantedBy=local-fs.target

Or add x-systemd.device-timeout option to your fstab mount rules. E.g.

UUID=d276a0d4-c95f-4792-a222-6d1451899de2 /home ext4 noatime,x-systemd.device-timeout=60s,errors=remount-ro 0 1

This will give systemd some time to do the work.

Official workaround from OpenSUSE: Devices time out at boot time but appear later

EDIT:

Also you can play around with:

[Install] WantedBy=dev-mapper-vg\x2dhome.device

For trigger unit file.
To get escaped path use systemd-escape

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  • I ran out of time and ended up putting the system into a VM under KVM debian 10. These look like viable work arounds for my problem though. Commented Apr 19, 2020 at 23:34
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My problem was solved by replacing the disk's device path by its UUID.

For example, change this :

/dev/mapper/isw_mydisk /data ext4 nobootwait 0 2

by

UUID=8b481900-fb7a-4e9e-929c-e940a6b913a4 /data ext4 nobootwait 0 2

Retrieve the disk's UUID running blkid

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  • This worked for me. Curiously I had the same LVM logical volume fail to mount twice in the space of a week, even though several volumes on the same physical volume are being mounted at the same time. Swapping just that affected volume to use the UUID in fstab fixed it, thanks. Commented Oct 24, 2024 at 16:08

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