[linux-lvm] Right way to resize LVM Volume on SAN?

[linux-lvm] Right way to resize LVM Volume on SAN?

[Alen Salamun]

Hello All!

I have read all the archives, HOWTO etc. but I don't seem to find the 
definitive guide to do it correctly.

My diskspace in Linux is on SAN. The last partition (/dev/sda3) is LVM, 
ext3 and it represents my /home. Now I expanded the SAN volume and I 
would like to add this additional space to this last LVM partition.

I already see larger disk space with fdisk. AFAIK I have now two 
options. Either I create new partition (for example /dev/sda4) and 
pvcreate it and add it to Logical Volume or I can resize existing 
/dev/sda3 since it is the last partition and I can resize it to new end 
sector.

I would prefer resizing existing partition. So I should make backup, 
delete existing partition /dev/sda3. make new partition with new end 
sector and same start sector and do pvresize, lvresize on it right?

Is there any other way to do it? It is after all quite something to 
delete existing live partiton and hope it still work after resize :)

Thank you!

Re: [linux-lvm] Right way to resize LVM Volume on SAN?

[Heinz Mauelshagen]

On Thu, Jun 08, 2006 at 10:53:12AM +0200, Alen Salamun wrote:
> Hello All!
> 
> I have read all the archives, HOWTO etc. but I don't seem to find the 
> definitive guide to do it correctly.
> 
> My diskspace in Linux is on SAN. The last partition (/dev/sda3) is LVM, 
> ext3 and it represents my /home. Now I expanded the SAN volume and I 
> would like to add this additional space to this last LVM partition.
> 
> I already see larger disk space with fdisk. AFAIK I have now two 
> options. Either I create new partition (for example /dev/sda4) and 
> pvcreate it and add it to Logical Volume or I can resize existing 
> /dev/sda3 since it is the last partition and I can resize it to new end 
> sector.
> 
> I would prefer resizing existing partition. So I should make backup, 
> delete existing partition /dev/sda3. make new partition with new end 
> sector and same start sector and do pvresize, lvresize on it right?
> 
> Is there any other way to do it? It is after all quite something to 
> delete existing live partiton and hope it still work after resize :)

man pvresize

> 
> Thank you!
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

-- 

Regards,
Heinz    -- The LVM Guy --

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

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Heinz Mauelshagen                                 Red Hat GmbH
Consulting Development Engineer                   Am Sonnenhang 11
Storage Development                               56242 Marienrachdorf
                                                  Germany
Mauelshagen@RedHat.com                            PHONE +49  171 7803392
                                                  FAX   +49 2626 924446
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Re: [linux-lvm] Right way to resize LVM Volume on SAN?

[Alen Salamun]

Thank you. I read that already. And since it only says:

"Expand the PV on /dev/sda1 AFTER enlarging the partition with fdisk"

my question is related on part of enlarging partition with fdisk. Do I 
have to do it in described way (delete, create new with extended last 
sector) to preserve data or is there any other "less destructive 
look-a-like" way?

Best regards

Heinz Mauelshagen wrote:
> On Thu, Jun 08, 2006 at 10:53:12AM +0200, Alen Salamun wrote:
>> Hello All!
>>
>> I have read all the archives, HOWTO etc. but I don't seem to find the 
>> definitive guide to do it correctly.
>>
>> My diskspace in Linux is on SAN. The last partition (/dev/sda3) is LVM, 
>> ext3 and it represents my /home. Now I expanded the SAN volume and I 
>> would like to add this additional space to this last LVM partition.
>>
>> I already see larger disk space with fdisk. AFAIK I have now two 
>> options. Either I create new partition (for example /dev/sda4) and 
>> pvcreate it and add it to Logical Volume or I can resize existing 
>> /dev/sda3 since it is the last partition and I can resize it to new end 
>> sector.
>>
>> I would prefer resizing existing partition. So I should make backup, 
>> delete existing partition /dev/sda3. make new partition with new end 
>> sector and same start sector and do pvresize, lvresize on it right?
>>
>> Is there any other way to do it? It is after all quite something to 
>> delete existing live partiton and hope it still work after resize :)
> 
> man pvresize
> 
>> Thank you!
>>
>> _______________________________________________
>> linux-lvm mailing list
>> linux-lvm@redhat.com
>> https://www.redhat.com/mailman/listinfo/linux-lvm
>> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> 

Re: [linux-lvm] Right way to resize LVM Volume on SAN?

[Luca Berra]

On Thu, Jun 08, 2006 at 04:06:10PM +0200, Alen Salamun wrote:
>Thank you. I read that already. And since it only says:
>
>"Expand the PV on /dev/sda1 AFTER enlarging the partition with fdisk"
>
>my question is related on part of enlarging partition with fdisk. Do I 
>have to do it in described way (delete, create new with extended last 
>sector) to preserve data or is there any other "less destructive 
>look-a-like" way?

sfdisk for backing up your partition table
parted to resize

-- 
Luca Berra -- bluca@comedia.it
        Communication Media & Services S.r.l.
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Re: [linux-lvm] Right way to resize LVM Volume on SAN?

[Zac Slade]

On Thursday 08 June 2006 14:56, Luca Berra wrote:
> On Thu, Jun 08, 2006 at 04:06:10PM +0200, Alen Salamun wrote:
> >Thank you. I read that already. And since it only says:
> >
> >"Expand the PV on /dev/sda1 AFTER enlarging the partition with fdisk"
That should probably be more generalized in the documentation.  Instead it 
should say "Expand the PV on /dev/<dev name> AFTER englarging the block 
device.  If the block device is a partition then you will need to enlarge the 
partition utilizing a tool for managing partitions like fdisk."

If the device in LVM is just a SAN backed LU then you really don't need 
partitions on it at all.  This would simplify your setup in the future if you 
just exposed the LU to the server and then just simply pvcreate the entire 
disk next time.  Then when you increase the size of the LU on the SAN you can 
validate its size using blockdev --getsize64 /dev/sda both before and after 
the change.  At that point a simple pvresize will pick up the new size and 
move forward.

Hope that sheds some light.
-- 
Zac Slade
krakrjak@volumehost.net
ICQ:1415282 YM:krakrjak AIM:ttyp99