[linux-lvm] lvm2, extending a physical volume

[Heinz J . Mauelshagen]

On Sat, Jul 12, 2003 at 11:09:13PM +0200, Jan Dittmer wrote:
> Hi,
> 
> would this be a reasonable course of action?
> 
> vgcfgbackup myraid
> pvcreate -yff -u wZQg66-cWrF-VDi5-GcRN-aYVg-RQQ3-PPm5K5 /dev/md0
> `take the size pvcreate reports and change the backup file accordingly`
> vgcfgrestore myraid

Yes, this is the workaround.
(vgcfgbackup shouldn't be necessary though)

Regards,
Heinz    -- The LVM Guy --


> 
> Thanks,
> 
> Jan
> 
> Heinz J . Mauelshagen wrote:
> > 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
> >>
> >>
> >>_______________________________________________
> >>linux-lvm mailing list
> >>linux-lvm at sistina.com
> >>http://lists.sistina.com/mailman/listinfo/linux-lvm
> >>read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> > _______________________________________________
> > linux-lvm mailing list
> > linux-lvm at sistina.com
> > http://lists.sistina.com/mailman/listinfo/linux-lvm
> > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> > 
> 
> 
> -- 
> Linux rubicon 2.5.75-mm1-jd10 #1 SMP Sat Jul 12 19:40:28 CEST 2003 i686
> 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm at sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> 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 at Sistina.com                           +49 2626 141200
                                                       FAX 924446
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