Hi .*,
I have an external USB hard disk that I use for automated
backups. I have written the following udev rules:
SUBSYSTEMS=="usb", ATTRS{serial}=="574341535530323537353839", KERNEL=="sd?", SYMLINK+="exthd", GROUP="plugdev"
SUBSYSTEMS=="usb", ATTRS{serial}=="574341535530323537353839", KERNEL=="sd?1", SYMLINK+="exthd1", GROUP="plugdev"
to create symlinks to the right device and partition, and I have a
fstab entry:
/dev/exthd1 /mnt/exthd ext3 user,auto,errors=remount-ro 0 2
to mount the backup partition automatically at boot time.
The problem is that sometimes, when init calls
fsck, /dev/exthd1 has not appeared yet, fsck bombs and init drops me to
an emergency shell. This happens about 50% of the times. Then I use the
emergency prompt to check if /dev/exthd1 actually exists, and, again,
50% of the times it doesn't; the /dev/sd?1 file is always there,
though. When /dev/exthd1 doesn't exist, a "udevadm trigger" will bring
it up.
This looks like some kind of race condition between kernel and
udev, but I don't really understand why udev doesn't pick on the new
devices automatically, as soon as the kernel creates them. I have tried
to add WAIT_FOR="/dev/exthd1" to my udev rule, but it didn't help.
Any help would be appreciated.
Davide