Re: debian9 amd64 failure to connect to lvmetad, falling back to device scanning

"It is not required for normal usage"

The fact is that the X79-based computer does not offer a login possibility, it goes to disk scanning (kernel et al) for hours (at least 4hr).

Access to file was only possible from a LAN-connected other computer (laptop VAIO) or booting from Super Grub2 disk.

Whether all issues arise from inability to connect to lvmetad, I cannot say. I am no system analyzer. I merely need the X79-GPU-based machine for applications (molecular dynamics with recent CUDA).

On Fri, May 19, 2017 at 10:24 AM, Darac Marjal <mailinglist@darac.org.uk> wrote:

On Fri, May 19, 2017 at 10:17:44AM +0200, Francesco Pietra wrote:

Hello:
On a vintage VAIO I have no problems with amd64 stretch. With a
raid1-based on the X79 chip, upgrading from jessie to stretch (I need
a higher CUDA version than available on jessie for latest
experimental NAMD molecular dynamics) went on regularly. However, the
command

# systemctl set-default multi-user.target

(which worked fine on said VAIO to boot at the $ linux prompt) led to
failure to connect to lvmetad, falling back to device scanning,
whereby an endless disk scanning begun.

I tried:

1) Super grub2 disk: OK it led to clean boot but I found no way to
fix the problem.

2) Accessing the X79 computer from said VAIO (both are on a LAN)
equally allowed to manage everything but I was unable to fix the
problem.

3) From said VAIO:
# systemctl enable lvm2-lvmetad.service

OK, but it was lost on needed reboot.

I never had to reinstall a debian amd64 but this time I am lost.

Thanks for any kind suggestion

Have you enabled the daemon in lvm.conf? Look for "use_lvmetad".

However, I think this should not be a problem. lvmetad is the LVM
Metadata Daemon, which is primarily a caching daemon. If you have a lot
of disks, or change your logical volumes frequently, the lvmetad can
speed up the varioud LVM commands. It is not required for normal usage
and ~99% of people can ignore the "failure to connect" message.

francesco pietra

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