[SOLVED] eudev-3.1.1 breaks LVM snapshot mounting

re_nelson · 06-09-2015, 12:02 AM

I have spent some time on this and tested all permutations. My evaluation is that eudev-3.1.1 is the agency responsible for breaking the mounting of an LVM snapshot, to wit:

Code:

lvcreate --snapshot --name lfs3snap --size 8G vg01/lfs3
Logical volume "lfs3snap" created.

mount /dev/mapper/vg01-lfs3snap /mnt/other/
mount: /dev/mapper/vg01-lfs3-real is already mounted or /mnt/other busy

The mount error only occurs with eudev-3.1.1. Rolling back to the prior eudev-3.1 revision resolves the problem. I'm not sure how widely used LVM is in the LFS world but this is a heads up for those who may run across this.

Given that using the SVN branch of LFS/BLFS yields a rapidly moving target, it took quite some to isolate the possible software packages involved. For the record, LVM is 2.02.120 in use here, that's the latest.

ReaperX7 · 06-09-2015, 01:52 AM

You should be using the mounting scripts to load lvm drives and partitions, not udev. Can you manually mount lvms still?

re_nelson · 06-09-2015, 01:57 AM

Quote:

Originally Posted by ReaperX7

You should be using the mounting scripts to load lvm drives and partitions, not udev. Can you manually mount lvms still?

I mount only snapshots manually on an as-needed basis. All other (non-snapshot) LVM devices mount faultlessly regardless of the eudev version.

ReaperX7 · 06-09-2015, 02:07 AM

I wonder if it also is anything with lvm2? Is the dmeventd daemon working?

re_nelson · 06-09-2015, 02:16 AM

Yep...dmeventd is up and running. To reiterate, the problem appeared only when 3.1.1 was installed. I've been using LVM since shortly after it came onto the landscape years ago. And my sole problem was with mounting a snapshot. Rolling back eudev by one-dot version was the remedy. All other aspects of my SVN/LFS/BLFS system are the very latest versions.