[linux-lvm] " Failed to find physical volume <ZFS block device"

Roger Heflin rogerheflin at gmail.com
Thu Sep 23 21:48:39 UTC 2021

If you have lvmetad running and in use then the lvm commands ask it
what the system has on it.

I have seen on random boots fairly separated systems (rhel7 versions,
and many years newer fedora systems) at random fail to find one or
more pv.s

I have disabled it at home, and in my day job we have also disabled
(across 20k+ systems) as we confirmed it had inconsistency issues
several times on a variety of our newest installs.

Stopping lvmetad and/or restarting it would generally fix it.    But
it was a source of enough random issues(often failure to mount on a
boot, so often issues that resulted in page-outs to debug)  and did
not speed things up much enough to be worth it even on devices with
>2000 SAN volumes.

On Thu, Sep 23, 2021 at 8:52 AM Zdenek Kabelac <zkabelac at redhat.com> wrote:
> Dne 22. 09. 21 v 18:48 alessandro macuz napsal(a):
> > fdisk correctly identifies the extended partition as 8e.
> > I wonder which kind of data lvmdiskscan and pvs use in order to list LVM
> > physical volumes.
> > Does PVS check some specific metadata within the partition without just
> > relying on the type of partition displayed by fdisk?
> >
> >
> Hi
> Yes - PVs do have header signature keeping information about PV attributes
> and also has the storage area to keep lvm2 metadata.
> Partition flags known to fdisk are irrelevant.
> Regards
> Zdenek
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