A start job is running for dev disk by как исправить

Main Situation :

You need to check the UUID under those files (answered in details on other answers…)

/etc/crypttab 
/etc/fstab
/etc/grub.d/40_custom 
/boot/grub2/grub.cfg

Alternative Situation I — Udev :

This could be caused by udev if you have a rule script under /etc/udev/rules.d/ that is not meant to run at boot time, if the script fail it will make that fstab step go on forever, just edit your script to match your needs or delete it.

Alternative situation II — Crypted Dev :

Crypted partitions can be confusing because the main partition have an UUID and the mapped Decrypted one have an other UUID different from the main one for a single partition they have to be defined in different place etc/crypttab and /etc/fstab

# lsblk -o name,uuid,mountpoint
├─sda2                         727fa348-8804-4773-ae3d-f3e176d12dac
│ └─sda2_crypt (dm-0)          P1kvJI-5iqv-s9gJ-8V2H-2EEO-q4aK-sx4aDi

Real UUID need to be specified in etc/crypttab

# cat /etc/crypttab
sda2_crypt  UUID=727fa348-8804-4773-ae3d-f3e176d12dac  none  luks

Virtual UUID need to be at /etc/fstab

# cat /etc/fstab
UUID=P1kvJI-5iqv-s9gJ-8V2H-2EEO-q4aK-sx4aDi / ext4 defaults,errors=remount-ro 0 1

Alternative situation III — Ghost Dev :

A device that is setup to be mounted at boot time but is not present in the system or detached like an usb drive.

Checkout real connected devices with lsblk -o name,uuid,mountpoint and edit /etc/fstab to keep only the connected device
OR leave the unconnected device there but set them up to be ignored at boot with the option noauto and set the line like this

UUID=BLA-BLA-BLA /mount ext4 option,noauto,option 0 0

Checking the system logs

journalctl -ab 

systemd-analyze blame

systemd-analyze critical-chain

systemctl status dev-mapper-crypt_sda2.device

systemctl status systemd-udev-settle.service

Sources: Linuxhacks.org
Disclosure: I am the owner of Linuxhacks.org

EDIT:
This thread got a bit off topic as I found several errors with my system not relevant to the cause of this error for me. If you have this error at boot, I’ve summised the fix in the last post on the thread (post number 10), but double check this post too to see that you do have the same error first!
———————————————————————————————————————————-

Hi all,

So I finished my first ever Arch Linux install using the wiki beginners guide and other wiki pages, so just want to start with a big thank you to everyone who contributes and maintains the information; I’ve managed to get all set up with xfce and lxdm and get all my hardware working only having prior experience with Ubuntu/Ubuntu clones using just the wiki and one cry for help with my WiFi card, so you are doing a fantastic job!

My one remaining niggle is that when I boot, my boot pauses for 1min 30secs for ‘Job dev-disk-byx2duuid-b072209dx2d279ax2d41cdx’ before continuting as normal and seeming to work. using blkid, I’ve matched the UUID to my swap partition and I looked up the error messages:

$ journalctl -b
...
dev-disk-byx2duuid-b072209dx2d279ax2d41cdx2db4b3x2d16eab1a84d60.device: Job dev-disk-byx2duuid-b072209dx2d279ax2d41cdx
Timed out waiting for device dev-disk-byx2duuid-b072209dx2d279ax2d41cdx2db4b3x2d16eab1a84d60.device.
Dependency failed for /dev/disk/by-uuid/b072209d-279a-41cd-b4b3-16eab1a84d60.
Dependency failed for Swap.
swap.target: Job swap.target/start failed with result 'dependency'.
dev-disk-byx2duuid-b072209dx2d279ax2d41cdx2db4b3x2d16eab1a84d60.swap: Job dev-disk-byx2duuid-b072209dx2d279ax2d41cdx2d
dev-disk-byx2duuid-b072209dx2d279ax2d41cdx2db4b3x2d16eab1a84d60.device: Job dev-disk-byx2duuid-b072209dx2d279ax2d41cdx
...

Next I checked that my swap partition is working:

$ swapon && free
NAME      TYPE       SIZE USED PRIO
/dev/sdb9 partition 11.2G   0B   -1
              total        used        free      shared  buff/cache   available
Mem:       12190888      801380    10708160      181104      681348    11135672
Swap:      11718652           0    11718652

I was concerned that my swap may not be working because of the 0B used, so I decided to open a LOT of tabs in chromium and change swappiness to test my swap:

$ sudo sysctl vm.swappiness=100
vm.swappiness = 100

Give it a minute…

$ free
              total        used        free      shared  buff/cache   available
Mem:       12190888     1677076     9769028      142820      744784    10295964
Swap:      11718652           0    11718652

I also tried to hibernate the computer, but it just shutdown. I’m only guessing here, but it doesn’t seem like swap is working properly?

My fstab entry for swap is:

# Swap Partition /dev/sdb9
UUID=b072209d-279a-41cd-b4b3-16eab1a84d60       none    swap    defaults                                        0       0

Any help appreciated thanks all!

JJ

Last edited by Jj (2015-09-01 03:36:37)