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I get this for my all LVM commands:

WARNING: Device /dev/dm-6 not initialized in udev database even after waiting 10000000 microseconds.

After that, it works, but all of them require about a half minute waiting.

udevadm info /dev/dm-5 (another volume) shows a pretty okay device. Comparing this to an udevadm info /dev/dm-6, I get a surprisingly short list:

P: /devices/virtual/block/dm-6
N: dm-6
L: 0
E: DEVPATH=/devices/virtual/block/dm-6
E: DEVNAME=/dev/dm-6
E: DEVTYPE=disk
E: MAJOR=253
E: MINOR=6
E: SUBSYSTEM=block

I think, /dev/dm-6 was somehow forgotten by the udev. I think I could easily fix it by simply asking udev to re-load this device. How can I do that?

Here I've read, turning off udev_sync and udev_rules in lvm.conf might work, but I would prefer a better solution.

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It looks, my problem is solved by reloading the udev rules without reboot. An

udevadm control --reload-rules && udevadm trigger

did what I wanted.

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