[linux-lvm] how to online resize pv?

[Stefan Priebe]

this does not work for me.

no partition table on vda:

# parted -l
Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/system-root: 21,5GB
Sector size (logical/physical): 512B/512B
Partition Table: loop

Number  Start  End     Size    File system  Flags
  1      0,00B  21,5GB  21,5GB  xfs


Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/system-boot: 210MB
Sector size (logical/physical): 512B/512B
Partition Table: loop

Number  Start  End    Size   File system  Flags
  1      0,00B  210MB  210MB  ext2


Error: /dev/vda: unrecognised disk label

# grub-install /dev/vda
/usr/sbin/grub-setup: error: unable to identify a filesystem in hd0; 
safety check can't be performed.

sure as there is no filesystem on sda.

Greets
Stefan

Am 30.07.2012 23:47, schrieb Stuart D Gathman:
> On 07/30/2012 04:45 PM, Stefan Priebe expounded in part:
>>
>>> Only when no partition is open.  That is one reason why LVM is an
>>> improvement over partition tables.  You don't have to use a partition
>>> table, just use the entire device as a PV.
>>
>>
>> that was my idea too but grub2 then refuses to install onto /dev/vda.
>> It says it cannot find a filesystem on hd0 which is /dev/vda.
> Grub2 supports LV boot partition now.  Most distro installers do not
> support this by default, however.  I set up my wife's laptop to boot
> from LV.  Here is an outline:
>
> http://forums.fedoraforum.org/showthread.php?t=264174
>
> The key line is adding GRUB_PRELOAD_MODULES=lvm so that grub can find
> the LV.  If your installer doesn't support it, you have to create the
> LVs, and copy filesystems from an installed system on another drive,
> then run grub2-install.
>
> I haven't tried Fedora 17 installer, to see if it can install grub2 with
> no partition table.