Assign each disk to constant /dev/sdX #need-help

gargdada · 15. August 2020

I'm running an OMV server on a mini-PC with 1 SSD as boot and 4 external drives as storage. System randomly keeps on assigning /dev/sd[a-z] to external drives which sometimes fails to auto-mount due to this situation. I would like to assign each Disk a fixed /dev/sdX

From what I read till now : I'm should "Persistent block device name", since I can change partitions in future, it should be done by-id.

Firstly Identify Disk by its Serial, via udevadm info /dev/sdX, note ID_SERIAL_SHORT

Then nano /etc/udev/rules.d/99-openmediavault-dev-disk-by-id.rules

ADD ACTION=="add", KERNEL=="sd[a-z]", ENV{ID_SERIAL_SHORT}=="X5ER1ALX", RUN+="/path/to/script /dev/%k"

eg: for my 4TB external ID_SERIAL_SHORT=XYZ123ABC456 which I want on /dev/sdb

ADD ACTION=="add", KERNEL=="sdb", ENV{ID_SERIAL_SHORT}=="XYZ123ABC456", RUN+="/path/to/script /dev/%k"

Tried this on my server. After reboot it it was still assigned the old /dev/sdX I don't really understand the second half of the script, there maybe in issue there I cant understand.

ryecoaaron · 15. August 2020

Zitat von gargdada

external drives which sometimes fails to auto-mount due to this situation.

The mounts shouldn't be using the device path. It should be mounting with filesystem uuid and then the device path doesn't matter if it changes. What does your /etc/fstab look like?

gargdada · 16. August 2020

Thanks ryecoaaron
Attached is the output for /etc/fstab and blkid and a picture of my file system
Drive Label Files and WD512GB are ones that usually give mount issues. They are both connected via USB 3.0 Enclosure

The device was not even unplugged, this happens after a reboot.

Found that people have faced similar issue with mounting but it was related to there hardware I suppose

https://github.com/openmediava…46#issuecomment-650265228

Code

# /etc/fstab: static file system information.
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda2 during installation
UUID=e9d30d39-ee5f-40b3-b753-978065f953a9 /               ext4    noatime,nodiratime,errors=remount-ro 0       1
# /boot/efi was on /dev/sda1 during installation
UUID=A80B-FD8F  /boot/efi       vfat    umask=0077      0       1
# swap was on /dev/sda3 during installation
# swap disabled with flash memory module
#UUID=b8080c54-e396-4788-9a1d-f4bc11d833f5 none            swap    sw              0       0
# >>> [openmediavault]
/dev/disk/by-label/Local                /srv/dev-disk-by-label-Local    ext4   defaults,nofail,user_xattr,noexec,usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0,acl   0 2
/dev/disk/by-label/Files                /srv/dev-disk-by-label-Files    ext4   defaults,nofail,user_xattr,noexec,usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0,acl   0 2
/dev/disk/by-label/4TB          /srv/dev-disk-by-label-4TB      ntfs    defaults,nofail 0 2
/dev/disk/by-label/MG2TB                /srv/dev-disk-by-label-MG2TB    ntfs   defaults,nofail  0 2
/dev/disk/by-label/WD512GB              /srv/dev-disk-by-label-WD512GB  ntfs   defaults,nofail  0 2
/srv/dev-disk-by-label-4TB/             /export/Media   none    bind,nofail    0 0


#blkid
/dev/sda1: LABEL="Files" UUID="a7c72144-fd49-48b6-987b-543b8bc2ef03" TYPE="ext4" PARTUUID="ab24bcee-8d97-47e7-a9a4-5dc54a74dd36"
/dev/sdb1: LABEL="SYSTEM" UUID="A80B-FD8F" TYPE="vfat" PARTUUID="50441c2a-c2dc-43d1-b549-25e25a076a4b"
/dev/sdb2: UUID="e9d30d39-ee5f-40b3-b753-978065f953a9" TYPE="ext4" PARTUUID="e58125d4-46c9-409b-ab39-47ee2f7e0921"
/dev/sdb4: LABEL="Local" UUID="f4541838-fb3c-4d49-a3e3-b002b4ee2b7b" TYPE="ext4" PARTUUID="b2d46105-3f70-496c-b45d-fac8eed60706"
/dev/sdc1: LABEL="WD512GB" UUID="AEE4937AE493438D" TYPE="ntfs" PARTUUID="0802ab85-01"
/dev/sdd1: LABEL="MG2TB" UUID="D220F3D920F3C311" TYPE="ntfs" PARTUUID="de5edfba-01"
/dev/sde2: LABEL="4TB" UUID="3890C32D90C2F084" TYPE="ntfs" PTTYPE="atari" PARTLABEL="Basic data partition" PARTUUID="e820dd2c-cf0b-4ed3-8c99-f782d32f8e8c"
/dev/sdb3: PARTUUID="082ac16a-2187-4406-9439-0593918d70cc"
/dev/sde1: PARTLABEL="Microsoft reserved partition" PARTUUID="e6c4c3d6-2b11-4e13-ab40-3539fea3cca6"

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I have posted this problem multiple places but couldn't find a solution yet.
if its not achievable by-id then any guide for doing this by-UUID

Have to admit that I have a little OCD and drives not showing up as I intended them to be is a bit bothersome

ryecoaaron · 17. August 2020

Your fstab isn't causing the problem. I am guessing that the usb drives are ready at boot time. After reboot, does sudo mount -a fix the issue?

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