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Tom
Asked: 2019-11-14 08:44:08 +0800 CST

LVM volumes on an external SSD in 19.10

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I have a USB3 SSD which is an LVM VG and PV with two LVs on it. When I first insert the device, everything works fine; the volumes show up as /dev/dm-X and links are created in /dev/mapper/<volume_name>. If I then remove the device and re-insert it, it doesn't work. The mapper devices are not removed when the disk is removed and even if I remove them manually, they are not recreated when the disk is reinserted.

Is this a know defect? Can I configure around this? Is there a way to recover this without rebooting?

ssd lvm external-hdd

1 Answers

  1. I don't really have a fix for this, but some notes:

    Pulling the plug on an LVM2 volume is not a good idea. Clean up properly if you can. To take such a disk offline:

    $ vgchange -a n <vg-name>
$ udisksctl lock -b /dev/sd<X>

    If you get in a mess with a disk that's been pulled, then you need to clean each logical volume up separately with:

    $ dmsetup remove <lv-name>

    After doing this, re-inserting the disk will do the right thing and map all the volumes correctly.

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