[linux-lvm] LVM2 on hardware RAID

[linux-lvm] LVM2 on hardware RAID

[Musil, William]

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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?


William T. Musil
Manager, Technical Services

LabVantage Solutions, Inc.
1160 US Highway 22 East, Bridgewater, NJ 08807
p| 908.333.0111
f | 908.707.1179 
e| wmusil@labvantage.com
i | www.labvantage.com

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FN:Musil, William
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Re: [linux-lvm] LVM2 on hardware RAID

[paddy]

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

RE: [linux-lvm] LVM2 on hardware RAID

[Greg Hartzog]

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I believe you will do the following:

 

"pvresive /dev/sdb"

 

That will make the volume group now be 600GB.

 

Then use "lvextend" to enlarge the logical volumes, and whatever the proper
tool is to extend the EXT3 filesystem.

 

Best to have the logical volumes & volume group offline ("vgchange -a n")
before starting resizing.

 

Just my $0.02.

 

  _____  

From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com] On
Behalf Of Musil, William
Sent: Friday, August 11, 2006 12:49 PM
To: linux-lvm@redhat.com
Subject: [linux-lvm] LVM2 on hardware RAID

 

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? 

 

William T. Musil 
Manager, Technical Services 

LabVantage Solutions, Inc. 
1160 US Highway 22 East, Bridgewater, NJ 08807 
p| 908.333.0111 
f | 908.707.1179 
e| wmusil@labvantage.com 
i | www.labvantage.com 

The information in this e-mail is confidential and may contain legally
privileged information. It is intended solely for the person or entity to
which it is addressed. Access to this e-mail by anyone else is unauthorized.
If you are not the intended recipient, any disclosure, copying,
distribution, action taken, or action omitted to be taken in reliance on it,
is prohibited and may be unlawful. If you received this e-mail in error,
please contact the sender and delete the material from any computer.

<<Musil, William.vcf>> 


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Re: [linux-lvm] LVM2 on hardware RAID

[paddy]

On Fri, Aug 11, 2006 at 03:26:44PM -0400, Greg Hartzog wrote:
> I believe you will do the following:
> 
> "pvresive /dev/sdb"

You can imagine how silly I felt when I read this :-)

I originally was going to reply with a mail which just said "pvresize?",
but then I thought I'd just have a quick look at the manual page, so
I shelled into a handy etch box, only to discover that it doesn't
have a pvresize.  And then I vaguely remembered how there are indeed
bits of the symetry missing that would be quite nice to have, and
how pvresize was one of those(?).

Have you got a pvresize? has one recently been added? where does William
get it from?

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

Re: [linux-lvm] LVM2 on hardware RAID

[Zak Kipling]

paddy wrote:

> I dont' have a pvresize or a pvextend, what version are you guys using ?

pvresize should be in 2.02.00 and later, according to WHATS_NEW.

I'm puzzled that you can't find it in etch (testing) though, since
(according to packages.debian.org) it has 2.02.06 -- and the files list
for the package includes /lib/lvm-200/pvresize. Sarge (stable), however,
only has 2.01.04 which won't have pvresize.


Zak.

Re: [linux-lvm] LVM2 on hardware RAID

[paddy]

On Mon, Aug 14, 2006 at 11:57:43PM +0100, Zak Kipling wrote:
> paddy wrote:
> 
> > I dont' have a pvresize or a pvextend, what version are you guys using ?
> 
> pvresize should be in 2.02.00 and later, according to WHATS_NEW.
> 
> I'm puzzled that you can't find it in etch (testing) though, since
> (according to packages.debian.org) it has 2.02.06 -- and the files list
> for the package includes /lib/lvm-200/pvresize. Sarge (stable), however,
> only has 2.01.04 which won't have pvresize.

ok, turns out I have 2.01.04-5 on that box.  I looked at packages.debian.org
and I agree that's what it says, and the developer info says it migrated in 
june ...

ok ... how's this for daft ...

# apt-get update
# dselect select

perhaps if I 'dselect update' ?

(better yet, I'd better get used to aptitude, which is a shame 'cos I like
dselect)

mystery solved.

Thanks!

(I'll go take a look at the code now, see if it's as simple as I thought :-)

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