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RE: Re: [linux-lvm] LVM2 on hardware RAID



Thanks for the reply. 

I would intend to do it offline. Not sure what you mean by dd in a shell.
Could you elaborate? 

Do you mean, make a backup, drop and recreate the pv, vg, lv, and
filesystems, and recover backup?
I was hoping not to have to do this, kinda defeats the purpose.
I was trying to get away with managing all of my filesystems within lvm as
LV's, trying to keep the pv's as simple as possible.


William T. Musil
Manager, Technical Services

LabVantage Solutions, Inc.
1160 US Highway 22 East, Bridgewater, NJ 08807
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f | 908.707.1179 
e| wmusil labvantage com
i | www.labvantage.com

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-----Original Message-----
From: linux-lvm-bounces redhat com
[mailto:linux-lvm-bounces redhat com]On Behalf Of paddy
Sent: Friday, August 11, 2006 1:25 PM
To: linux-lvm redhat com
Subject: Re: [linux-lvm] LVM2 on hardware RAID


On Fri, Aug 11, 2006 at 12:48:42PM -0400, Musil, William wrote:
> Hello all.
> 
> I have an issue, that I am not sure how to address.
> 
> How can I resize the physical volume if I change the geometry of the disk
> (non-destructive resize of RAID volume at the hardware level) 
> I can see that the OS has picked up the new size of the disk and I would
like
> to resize the existing pv. I don't know how.
> 
> I started with a hardware raid 5 (400GB), linux automatically recognizes
disk
> as /dev/sdb
> 
> a simplistic representation of the setup is as follows
> 
> pvcreate /dev/sdb
> vgcreate VolGroup10 /dev/sdb
> lvcreate -n LogVol10 VolGroup10
> mkfs.ext3 /dev/mapper/VolGroup10-LogVol10
> 
> I have added a disk and expand the array to 600GB I can still see every
thing
> but I don't know how to extend the PV.
> 
> filesystems OK
> logical volumes OK
> volume groups OK
> 
> linux sees /dev/sdb as 600GB
> pvs shows pv /dev/sdb is 400GB. I wish to, non-destructively, reinitialize
> /dev/sdb so that pvs shows 600GB. how?

online or offline ?

I'm not aware of any tool that will resize your PV online.  I can't
immediately
think that it would be hugely difficult, but it's a piece of work :-)

as for offline, you could do that in an afternoon with shell and dd :-)

Other possible strategies include, having partitioned your raid in the first
place (yes I know this is silly, but you can see what I mean), or perhaps
converting to some other VM software that can do what you need (like, will
EVMS do this??)  Perhaps there is a way to emulate the 'having partitioned
first strategy' and make the new 200G addressable as a seperate block
device, at which point a pvmerge command would come in handy :-)
(of course that would be easier if the PEs were PE size aligned to the
underlying device, but you could take account of that in where you 
started your new PV :-)

Or perhaps some kind soul will point you to something I have missed.

Good Luck.

Regards,
Paddy
-- 
Perl 6 will give you the big knob. -- Larry Wall

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