[linux-lvm] finding the right size for rootvg

[linux-lvm] finding the right size for rootvg

[cmc2slack-lvm]

I'm re-installing slackware 9.1 on my linux box,
trying to set up LVM and ReiserFs. I'm pretty new
at this, learning as I go along.

I originally installed to another partition, now
I've creating a fresh partition and following the
LVM how-to about how to set up a root volume group. 
My questions are about partition and volume group size.

The first time I created a partition and PV I made
it 5GB and found that I had created the rootvg too
small by default to allocate enough space. So reading the
man pages I figured out that I need to specify a
certain extent size when I create the rootvg in order
to use the space properly. Right now the partition is
a little over 4GB and the rootvg is 3.97GB with an
extent size of 8MB. Is this small extent size a good
idea or will it cause problems later?

Thanks for any advice,

Re: [linux-lvm] finding the right size for rootvg

[Heinz Mauelshagen]

On Fri, Feb 20, 2004 at 07:12:31AM -0800, cmc2slack-lvm@yahoo.com wrote:
> I'm re-installing slackware 9.1 on my linux box,
> trying to set up LVM and ReiserFs. I'm pretty new
> at this, learning as I go along.
> 
> I originally installed to another partition, now
> I've creating a fresh partition and following the
> LVM how-to about how to set up a root volume group. 
> My questions are about partition and volume group size.
> 
> The first time I created a partition and PV I made
> it 5GB and found that I had created the rootvg too
> small by default to allocate enough space. So reading the
> man pages I figured out that I need to specify a
> certain extent size when I create the rootvg in order
> to use the space properly. Right now the partition is
> a little over 4GB and the rootvg is 3.97GB with an
> extent size of 8MB. Is this small extent size a good
> idea or will it cause problems later?

It'll 'limit' you to a maximum LV size of 512GB if that is an issue in LVM1.
Once you migrate to LVM2 there's no such constraint any more.

> 
> Thanks for any advice,
> 
> _______________________________________________
> 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
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@RedHat.com                            +49 2626 141200
                                                       FAX 924446
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Re: [linux-lvm] finding the right size for rootvg

[cmc2slack-lvm]

Heinz writes:

> It'll 'limit' you to a maximum LV size of 512GB if that is an issue
> in LVM1.
> Once you migrate to LVM2 there's no such constraint any more.

Thanks Heinz, that's not a problem since this is a 
home system, only has 8GB and 60GB HD's. Will the
small extent make a difference in performance?

=====
Chris Conn
cmc2goat@swbell.net
http://storm.cadcam.iupui.edu/~cmcgoat
Austin, TX, USA

Re: [linux-lvm] finding the right size for rootvg

[Heinz Mauelshagen]

On Fri, Feb 20, 2004 at 07:56:35AM -0800, cmc2slack-lvm@yahoo.com wrote:
> Heinz writes:
> 
> > It'll 'limit' you to a maximum LV size of 512GB if that is an issue
> > in LVM1.
> > Once you migrate to LVM2 there's no such constraint any more.
> 
> Thanks Heinz, that's not a problem since this is a 
> home system, only has 8GB and 60GB HD's. Will the
> small extent make a difference in performance?

Smaller extents cause larger mapping tables in LVM1.
Typically you won't be able to see a performance difference.

> 
> =====
> Chris Conn
> cmc2goat@swbell.net
> http://storm.cadcam.iupui.edu/~cmcgoat
> Austin, TX, USA
> 
> _______________________________________________
> 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
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@RedHat.com                            +49 2626 141200
                                                       FAX 924446
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-