[bug #44534] No support for LVM mirror type "raid1"

[Candid Dauth]

URL:
  <http://savannah.gnu.org/bugs/?44534>

                 Summary: No support for LVM mirror type "raid1"
                 Project: GNU GRUB
            Submitted by: cdauth
            Submitted on: Fri 13 Mar 2015 11:59:30 GMT
                Category: Filesystem
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: 2.02~beta1
         Reproducibility: None
         Planned Release: None

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Details:

LVM has support for two mirror types: "raid1" and "mirror". "raid1" is the
default type in the newest versions of LVM and "mirror" is called a "legacy
type" in the man page.

The raid1 type does not require manually creating a log volume and has some
performance advantages that are similar to those of other RAID1
implementations. See <a
href="http://wiki.gentoo.org/wiki/LVM#Mirroring_.28RAID1.29";>this manual</a>
on how to create raid1 mirrored volumes.

GRUB does not seem to recognise raid1 volumes. In GRUB itself, the volumes are
simply not displayed using the "ls" command. GRUB will refuse to boot from
raid1 volumes. Also grub-install will fail when the root partition is a raid1
volume, reporting "grub-install: info: unknown LVM type raid1" on the way and
in the end complaining about not finding the root device.

This means that a system unexpectedly becomes unbootable if a mirror is added
to the root partition using lvconvert. (For the record: The problem disappears
again after simply removing the mirror.)




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