Re: [coLinux-users] How to access a logical partition

[Harald W. <hwe...@gm...>]

Hello again,

Henry Nestler <Hen...@Ar...>:

>Logical disk can access. But I have never used LVM there.

I have no made some further experiments and set

hda5 type "Linux LVM" and an LVM physical volume
hda6 type "Linux", but contains also an LVM PV
hda7 type "Linux LVM" but contains an ext3 partition
hda8 type "Linux" and contains an ext3 partition

The results:

Only the devices of type "Linux" are recognized by coLinux.
The partitions of type "Linux LVM" are ignored and yield to the
error message "No such device" when being accessed with cat or dd.

The ext3 partition hda8 can be mounted without further problems into
colinux.

The LVM partition hda6 is not recognized by LVM inside coLinux, unless
the following parameter is set in /etc/lvm/lvm.conf:

    # List of pairs of additional acceptable block device types found
    # in /proc/devices with maximum (non-zero) number of partitions.
    types = [ "cobd", 32 ]


All in all, this is not nice but solves my problems accessing a logical
partition containing LVM.


>That's a strong result. In normal case, all Linux Partition have a line
>  "Fixed hard disk media. Block size = 512"
>Is that normal for LVM, that they don't have? I don't know.

With the above configuration, it looks like:

[...]
\\?\Device\Harddisk0\Partition4
  link to \\?\Device\HarddiskVolume4
  size is 55002415104 bytes
\\?\Device\Harddisk0\Partition5
  link to \\?\Device\HarddiskVolume5
  Fixed hard disk media. Block size = 512
  size is 55002415104 bytes
\\?\Device\Harddisk0\Partition6
  link to \\?\Device\HarddiskVolume6
  size is 55002415104 bytes
\\?\Device\Harddisk0\Partition7
  link to \\?\Device\HarddiskVolume7
  Fixed hard disk media. Block size = 512
  size is 55306750464 bytes
[...]

E.g. all partitions of type "Linux" are displayed with the "Fixed hard
disk media. Block size = 512" line, but not the "Linux LVM" partitions.
It does not matter wether the partitions actually contain LVM or ext3.

Regards,
Harald