[bug #36004] grub-probe has trouble with lvm on raid

[Kevin Murphy]

URL:
  <http://savannah.gnu.org/bugs/?36004>

                 Summary: grub-probe has trouble with lvm on raid
                 Project: GNU GRUB
            Submitted by: kemurphy
            Submitted on: Mon 26 Mar 2012 04:34:36 AM GMT
                Category: Installation
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: other
         Reproducibility: Every Time
         Planned Release: None

    _______________________________________________________

Details:

I have an EFI System Partitition on a USB stick, and four 1TB hard drives set
up in a RAID5 with LVM on top of it (currently it is running as a degenerate
array with 3 of 4 devices, though).  One of the LVM logical volumes is mounted
on /boot, and the USB stick is mounted on /boot/efi.  I can't seem to install
grub with this setup, even though it seems like it should be possible.

When I run grub-install --target=x86_64-efi --recheck, I get:
Path `/boot/grub' is not readable by GRUB on boot. Installation is impossible.
Aborting.

When I run grub-probe /boot/grub -vv, I get:
grub-probe: info: cannot open `//boot/grub/device.map': No such file or
directory.
grub-probe: info: changing current directory to /dev/mapper.
util/getroot.c:1822: /dev/dm-4 is an LVM
grub-probe: info: changing current directory to /dev.
grub-probe: info: changing current directory to sae.
grub-probe: info: changing current directory to /dev.
grub-probe: info: changing current directory to sae.
grub-probe: info: changing current directory to shm.
grub-probe: info: changing current directory to pts.
grub-probe: info: changing current directory to disk.
grub-probe: info: changing current directory to by-label.
grub-probe: info: changing current directory to by-uuid.
grub-probe: info: changing current directory to by-path.
grub-probe: info: changing current directory to by-id.
grub-probe: info: changing current directory to block.
grub-probe: info: changing current directory to /dev.
grub-probe: info: changing current directory to sae.
grub-probe: info: changing current directory to shm.
grub-probe: info: changing current directory to pts.
grub-probe: info: changing current directory to /dev.
grub-probe: info: changing current directory to sae.
grub-probe: info: changing current directory to shm.
grub-probe: info: changing current directory to pts.
grub-probe: info: changing current directory to disk.
grub-probe: info: changing current directory to by-label.
grub-probe: info: changing current directory to by-uuid.
grub-probe: info: changing current directory to by-path.
grub-probe: info: changing current directory to by-id.
grub-probe: info: changing current directory to block.
grub-probe: info: Looking for /dev/sda1.
grub-probe: info: /dev/sda1 starts from 40.
grub-probe: info: opening the device hostdisk//dev/sda.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sda'...
grub-probe: info: the size of hostdisk//dev/sda is 1953525168.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sda'...
grub-probe: info: the size of hostdisk//dev/sda is 1953525168.
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sda
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sda.
grub-core/kern/emu/hostdisk.c:851: opening the device `/dev/sda' in
open_device()
grub-probe: info: no LVM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-probe: info: scanning hostdisk//dev/sda for LDM.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-probe: info: no LDM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sda
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sda.
grub-core/kern/emu/hostdisk.c:851: opening the device `/dev/sda1' in
open_device()
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda1'
grub-core/disk/diskfilter.c:806: Found array sae
grub-probe: info: Found array sae.
grub-core/disk/diskfilter.c:1003: Inserting hostdisk//dev/sda into sae (lvm)
grub-probe: info: Inserting hostdisk//dev/sda into sae (lvm)
.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sda'...
grub-probe: info: the size of hostdisk//dev/sda is 1953525168.
grub-core/kern/disk.c:230: Opening `lvm/sae-swap'...
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
lvm/sae-swap
grub-probe: info: Scanning for DISKFILTER devices on disk lvm/sae-swap.
grub-core/kern/emu/hostdisk.c:851: opening the device `/dev/sda' in
open_device()
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-probe: info: no LVM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-probe: info: scanning lvm/sae-swap for LDM.
grub-probe: info: no LDM signature found.
grub-core/partmap/apple.c:123: bad magic (found 0xeeb9; wanted 0x4552
grub-core/kern/disk.c:326: Closing `lvm/sae-swap'.
grub-core/kern/disk.c:230: Opening `lvm/sae-sys'...
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
lvm/sae-sys
grub-probe: info: Scanning for DISKFILTER devices on disk lvm/sae-sys.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-probe: info: no LVM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-probe: info: scanning lvm/sae-sys for LDM.
grub-probe: info: no LDM signature found.
grub-core/partmap/apple.c:123: bad magic (found 0xd9b6; wanted 0x4552
grub-core/kern/disk.c:326: Closing `lvm/sae-sys'.
grub-core/kern/disk.c:230: Opening `lvm/sae-web'...
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
lvm/sae-web
grub-probe: info: Scanning for DISKFILTER devices on disk lvm/sae-web.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-probe: info: no LVM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-probe: info: scanning lvm/sae-web for LDM.
grub-probe: info: no LDM signature found.
grub-core/partmap/apple.c:123: bad magic (found 0x898b; wanted 0x4552
grub-core/kern/disk.c:326: Closing `lvm/sae-web'.
grub-core/kern/disk.c:230: Opening `lvm/sae-files'...
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
lvm/sae-files
grub-probe: info: Scanning for DISKFILTER devices on disk lvm/sae-files.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-probe: info: no LVM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-probe: info: scanning lvm/sae-files for LDM.
grub-probe: info: no LDM signature found.
grub-core/partmap/apple.c:123: bad magic (found 0x8f36; wanted 0x4552
grub-core/kern/disk.c:326: Closing `lvm/sae-files'.
grub-core/partmap/apple.c:123: bad magic (found 0x0; wanted 0x4552
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/apple.c:123: bad magic (found 0xeb63; wanted 0x4552
grub-core/kern/disk.c:326: Closing `hostdisk//dev/sda'.
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-probe: info: Partition 0 starts from 40.
grub-core/kern/disk.c:326: Closing `hostdisk//dev/sda'.
grub-probe: info: Looking for /dev/sdc1.
grub-probe: info: /dev/sdc1 starts from 40.
grub-probe: info: opening the device hostdisk//dev/sdc.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sdc'...
grub-probe: info: the size of hostdisk//dev/sdc is 1953525168.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sdc'...
grub-probe: info: the size of hostdisk//dev/sdc is 1953525168.
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sdc
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sdc.
grub-core/kern/emu/hostdisk.c:851: opening the device `/dev/sdc' in
open_device()
grub-probe: info: no LVM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdc'
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdc'
grub-probe: info: scanning hostdisk//dev/sdc for LDM.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdc'
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-probe: info: no LDM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdc'
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sdc
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sdc.
grub-probe: info: no LVM signature found.
grub-core/kern/emu/hostdisk.c:851: opening the device `/dev/sdc1' in
open_device()
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdc1'
grub-core/disk/diskfilter.c:806: Found array md/md0
grub-probe: info: Found array md/md0.
grub-core/disk/diskfilter.c:1003: Inserting hostdisk//dev/sdc into md/md0
(mdraid09)
grub-probe: info: Inserting hostdisk//dev/sdc into md/md0 (mdraid09)
.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sdc'...
grub-probe: info: the size of hostdisk//dev/sdc is 1953525168.
grub-core/partmap/apple.c:123: bad magic (found 0x3b4f; wanted 0x4552
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/apple.c:123: bad magic (found 0xeb63; wanted 0x4552
grub-core/kern/disk.c:326: Closing `hostdisk//dev/sdc'.
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-probe: info: Partition 0 starts from 40.
grub-core/kern/disk.c:326: Closing `hostdisk//dev/sdc'.
grub-probe: info: Looking for /dev/sdb1.
grub-probe: info: /dev/sdb1 starts from 40.
grub-probe: info: opening the device hostdisk//dev/sdb.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sdb'...
grub-probe: info: the size of hostdisk//dev/sdb is 1953525168.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sdb'...
grub-probe: info: the size of hostdisk//dev/sdb is 1953525168.
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sdb
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sdb.
grub-core/kern/emu/hostdisk.c:851: opening the device `/dev/sdb' in
open_device()
grub-probe: info: no LVM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdb'
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdb'
grub-probe: info: scanning hostdisk//dev/sdb for LDM.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdb'
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-probe: info: no LDM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdb'
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sdb
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sdb.
grub-probe: info: no LVM signature found.
grub-core/kern/emu/hostdisk.c:851: opening the device `/dev/sdb1' in
open_device()
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdb1'
grub-core/disk/diskfilter.c:1003: Inserting hostdisk//dev/sdb into md/md0
(mdraid09)
grub-probe: info: Inserting hostdisk//dev/sdb into md/md0 (mdraid09)
.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sdb'...
grub-probe: info: the size of hostdisk//dev/sdb is 1953525168.
grub-core/partmap/apple.c:123: bad magic (found 0x3b4f; wanted 0x4552
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/apple.c:123: bad magic (found 0x0; wanted 0x4552
grub-core/kern/disk.c:326: Closing `hostdisk//dev/sdb'.
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-probe: info: Partition 0 starts from 40.
grub-core/kern/disk.c:326: Closing `hostdisk//dev/sdb'.
util/getroot.c:1822: /dev/dm-4 is an LVM
grub-probe: info: changing current directory to /dev.
grub-probe: info: changing current directory to sae.
grub-probe: info: changing current directory to /dev.
grub-probe: info: changing current directory to sae.
grub-probe: info: changing current directory to shm.
grub-probe: info: changing current directory to pts.
grub-probe: info: changing current directory to disk.
grub-probe: info: changing current directory to by-label.
grub-probe: info: changing current directory to by-uuid.
grub-probe: info: changing current directory to by-path.
grub-probe: info: changing current directory to by-id.
grub-probe: info: changing current directory to block.
grub-probe: info: changing current directory to /dev.
grub-probe: info: changing current directory to sae.
grub-probe: info: changing current directory to shm.
grub-probe: info: changing current directory to pts.
grub-probe: info: changing current directory to /dev.
grub-probe: info: changing current directory to sae.
grub-probe: info: changing current directory to shm.
grub-probe: info: changing current directory to pts.
grub-probe: info: changing current directory to disk.
grub-probe: info: changing current directory to by-label.
grub-probe: info: changing current directory to by-uuid.
grub-probe: info: changing current directory to by-path.
grub-probe: info: changing current directory to by-id.
grub-probe: info: changing current directory to block.
grub-probe: info: Looking for /dev/sda1.
grub-probe: info: /dev/sda1 starts from 40.
grub-probe: info: opening the device hostdisk//dev/sda.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sda'...
grub-probe: info: the size of hostdisk//dev/sda is 1953525168.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sda'...
grub-probe: info: the size of hostdisk//dev/sda is 1953525168.
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sda
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sda.
grub-probe: info: no LVM signature found.
grub-core/kern/emu/hostdisk.c:851: opening the device `/dev/sda' in
open_device()
grub-probe: info: scanning hostdisk//dev/sda for LDM.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-probe: info: no LDM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sda
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sda.
grub-core/partmap/apple.c:123: bad magic (found 0x0; wanted 0x4552
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/apple.c:123: bad magic (found 0xeb63; wanted 0x4552
grub-core/kern/disk.c:326: Closing `hostdisk//dev/sda'.
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-probe: info: Partition 0 starts from 40.
grub-core/kern/disk.c:326: Closing `hostdisk//dev/sda'.
grub-probe: info: Looking for /dev/sdc1.
grub-probe: info: /dev/sdc1 starts from 40.
grub-probe: info: opening the device hostdisk//dev/sdc.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sdc'...
grub-probe: info: the size of hostdisk//dev/sdc is 1953525168.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sdc'...
grub-probe: info: the size of hostdisk//dev/sdc is 1953525168.
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sdc
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sdc.
grub-probe: info: no LVM signature found.
grub-core/kern/emu/hostdisk.c:851: opening the device `/dev/sdc' in
open_device()
grub-probe: info: scanning hostdisk//dev/sdc for LDM.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdc'
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-probe: info: no LDM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdc'
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sdc
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sdc.
grub-core/partmap/apple.c:123: bad magic (found 0x3b4f; wanted 0x4552
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/apple.c:123: bad magic (found 0xeb63; wanted 0x4552
grub-core/kern/disk.c:326: Closing `hostdisk//dev/sdc'.
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-probe: info: Partition 0 starts from 40.
grub-core/kern/disk.c:326: Closing `hostdisk//dev/sdc'.
grub-probe: info: Looking for /dev/sdb1.
grub-probe: info: /dev/sdb1 starts from 40.
grub-probe: info: opening the device hostdisk//dev/sdb.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sdb'...
grub-probe: info: the size of hostdisk//dev/sdb is 1953525168.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sdb'...
grub-probe: info: the size of hostdisk//dev/sdb is 1953525168.
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sdb
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sdb.
grub-probe: info: no LVM signature found.
grub-core/kern/emu/hostdisk.c:851: opening the device `/dev/sdb' in
open_device()
grub-probe: info: scanning hostdisk//dev/sdb for LDM.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdb'
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-probe: info: no LDM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdb'
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sdb
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sdb.
grub-core/partmap/apple.c:123: bad magic (found 0x3b4f; wanted 0x4552
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/apple.c:123: bad magic (found 0x0; wanted 0x4552
grub-core/kern/disk.c:326: Closing `hostdisk//dev/sdb'.
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-probe: info: Partition 0 starts from 40.
grub-core/kern/disk.c:326: Closing `hostdisk//dev/sdb'.
util/getroot.c:1822: /dev/dm-4 is an LVM
grub-probe: info: opening lvm/sae-boot.
grub-core/kern/disk.c:230: Opening `lvm/sae-boot'...
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sda'...
grub-probe: info: the size of hostdisk//dev/sda is 1953525168.
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sda
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sda.
grub-probe: info: no LVM signature found.
grub-core/kern/emu/hostdisk.c:851: opening the device `/dev/sda' in
open_device()
grub-probe: info: scanning hostdisk//dev/sda for LDM.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-probe: info: no LDM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sda'
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sda
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sda.
grub-core/partmap/apple.c:123: bad magic (found 0x0; wanted 0x4552
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/apple.c:123: bad magic (found 0xeb63; wanted 0x4552
grub-core/kern/disk.c:326: Closing `hostdisk//dev/sda'.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sdc'...
grub-probe: info: the size of hostdisk//dev/sdc is 1953525168.
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sdc
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sdc.
grub-probe: info: no LVM signature found.
grub-core/kern/emu/hostdisk.c:851: opening the device `/dev/sdc' in
open_device()
grub-probe: info: scanning hostdisk//dev/sdc for LDM.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdc'
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-probe: info: no LDM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdc'
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sdc
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sdc.
grub-core/partmap/apple.c:123: bad magic (found 0x3b4f; wanted 0x4552
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/apple.c:123: bad magic (found 0xeb63; wanted 0x4552
grub-core/kern/disk.c:326: Closing `hostdisk//dev/sdc'.
grub-core/kern/disk.c:230: Opening `hostdisk//dev/sdb'...
grub-probe: info: the size of hostdisk//dev/sdb is 1953525168.
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sdb
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sdb.
grub-probe: info: no LVM signature found.
grub-core/kern/emu/hostdisk.c:851: opening the device `/dev/sdb' in
open_device()
grub-probe: info: scanning hostdisk//dev/sdb for LDM.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdb'
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-probe: info: no LDM signature found.
grub-core/kern/emu/hostdisk.c:829: reusing open device `/dev/sdb'
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/gpt.c:87: Read a valid GPT header
grub-core/partmap/gpt.c:111: GPT entry 0: start=40, length=1953525095
grub-core/disk/diskfilter.c:127: Scanning for DISKFILTER devices on disk
hostdisk//dev/sdb
grub-probe: info: Scanning for DISKFILTER devices on disk hostdisk//dev/sdb.
grub-core/partmap/apple.c:123: bad magic (found 0x3b4f; wanted 0x4552
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/msdos.c:172: partition 0: flag 0x0, type 0xee, start 0x1,
len 0x74706daf
grub-core/partmap/apple.c:123: bad magic (found 0x0; wanted 0x4552
grub-core/kern/disk.c:326: Closing `hostdisk//dev/sdb'.
grub-core/kern/disk.c:312: Opening `lvm/sae-boot' failed.
grub-core/kern/disk.c:326: Closing `lvm/sae-boot'.
grub-probe: error: disk `lvm/sae-boot' not found.

To me it looks like grub-probe is finding LVM data straight from /dev/sda and
not /dev/md0, but I can't be sure since I'm no grub expert....  This is with
grub-2.00beta2, by the way.

Thanks,




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