Re: mapping usb disks to devices
Tzafrir Cohen <[email protected]>
| Newsgroups | gmane.linux.region.israel |
|---|---|
| Message-ID | <[email protected]> |
On Wed, Aug 16, 2017 at 10:21:59PM +0300, Gabor Szabo wrote:
> Hi,
>
> I have a USB hub connected to my Raspberry Pi and I have several
> external Hard disks connected to the USB hub.
> It seems the order the hard disks are mapped to the device files
> /dev/sda1 /dev/sdb1 /dev/sdc1 is random. On every boot it might be different.
>
> This of course breaks the mapping I have in /etc/fstab for the mounts.
>
> How can I solve this so I won't need to update /etc/fstab after every boot?
Standard udev rules create on my system the following 4 subdirectories
under /dev/disk:
by-id by-label by-partuuid by-path by-uuid
Each directory has symlinks to either a disk or a partition. One of
those should describe your external disk properly.
If this is not good enough, you can make your own.
$ cat /etc/udev/rules.d/90-backup-usb.rules
ACTION=="add", ENV{ID_FS_LABEL}=="backup-boole-*", \
SYMLINK+="backup"
And in fstab:
/dev/backup /mnt/backup ext4 rw,noauto 0 0
There are several backup disks with different labels. The backup disk
that is connected is mounted by the backup script, but /dev/backup is
created by the udev rule.
--
Tzafrir Cohen | tzafrir-/[email protected] | VIM is
http://tzafrir.org.il | | a Mutt's
[email protected] | | best
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