------- Comment From [email protected] 2021-01-14 04:48 EDT-------
Thanks! I remember that the system was installed on a single path. Later on, 
more paths were added. And no initramfs was rebuilt. I think that's the case. 
Is there any procedure for Ubuntu to deal with such case for boot LVM device? 
Thanks!

(In reply to comment #15)
> Do you remember what happened just prior to the reboot - have you been
> upgrading the system with a new kernel and/or updated packages?
> (Btw. the kernel 4.15.0-91 is a bit outdated, current is 4.15.0-124.)
> There's maybe a file /etc/lvm/lvm.conf.dpkg-dist available from a previous
> upgrade.
>
> Or have you added more or changed FCP or iSCSI disks to the system, that may
> have let to a name clash or device (path) discovery order issues?
> And was the initramfs rebuild?
>
> Such an issue can also happen due to temporarily unavailable paths or
> devices, and there seem to be some of them in that system.
> Do you have LUN masking (zoning) in your SAN in place, so that the host can
> only see the LUNs it's supported to see?
>
> Btw. I think in your filter rule you also want to accept the sd* (SCSI/FCP)
> devices, so:
> filter = [ "a|/dev/sd*|", "a|/dev/mapper/mpath*|", "r|.*|" ]
> and you may add the same as global filter:
> global_filter = [ "a|/dev/sd*|", "a|/dev/mapper/mpath*|", "r|.*|" ]
> for system level scans.
> According to the logs the system seems to expect '/dev/mapper/ISVCL1--vg',
> so looks you have LVM on top of multipath?

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Title:
  [UBUNTU 18.04] lvm boot failure

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