Re: [linux-lvm] lvm2, extending a physical volume

["Heinz J . Mauelshagen" <mauelshagen@sistina.com>]

Jan,

you didn't overlook something. There's a bug in the

pvcreate -yff -u wZQg66-cWrF-VDi5-GcRN-aYVg-RQQ3-PPm5K5 /dev/md0
vgcfgrestore myraid

trick we'll fix ASAP (vgcfgrestore should keep the new size which it doesn't).

We're thinking about a pvresize command to make this smoother.

Regards,
Heinz    -- The LVM Guy --


On Tue, Jul 08, 2003 at 11:59:32AM +0200, Jan Dittmer wrote:
> Hi,
> 
> I posted this a while ago on lvm-devel, but received no answer.
> I'm using kernel 2.5(.74-mm2) with LVM2 and have a RAID5 to which I 
> added a new disk with raidreconf. This worked fine, but lvm doesn't 
> recognize the extra disk space:
> 
> # pvdisplay
>    --- Physical volume ---
>    PV Name               /dev/md0
>    VG Name               myraid
>    PV Size               335.36 GB / not usable 0
>    Allocatable           yes (but full)
>    PE Size (KByte)       4096
>    Total PE              85853
>    Free PE               0
>    Allocated PE          85853
>    PV UUID               wZQg66-cWrF-VDi5-GcRN-aYVg-RQQ3-PPm5K5
> 
> but:
> 
> # cat /proc/mdstat
> Personalities : [linear] [raid0] [raid1] [raid5] [multipath]
> 
> md0 : active raid5 hdc1[4] hdh1[3] hdf1[2] hdg1[1] hde1[0]
>        468872704 blocks level 5, 4k chunk, algorithm 2 [5/5] [UUUUU]
> 
> which translates to ~480 GB (5x 120GB)
> 
> Somewhere I found a post, that with vgcfgbackup / vgcfgrestore one is 
> able to resize the volume. But simply backing up and restoring the 
> descriptor just gets me to the same situation.
> As I've another partition (which isn't that important) I tried to change 
> the backup manually, ie. I changed pe_count in the backup file and 
> restored it. This works fine - but how do I figure the correct PE count 
> for this bigger disk? I just don't want to poke around until it says, 
> 'hey, too big, trashing your data'. There has to be a simple way, I 
> guess, which I totally overlook. It isn't that big of a change.
> pvresize tells me it isn't implemented.
> 
> Thanks for any insight,
> 
> Jan
> 
> # vgdisplay --version
>    LVM version:     1.95.15 (2003-01-10)
>    Library version: 0.96.08-ioctl (2003-03-27)
>    Driver version:  1.0.6
> 
> -- 
> Linux rubicon 2.5.74-mm2-jd4 #1 SMP Sun Jul 6 09:55:20 CEST 2003 i686
> 
> 
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

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Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
                                                       FAX 924446
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