[linux-lvm] LE discussion

[linux-lvm] LE discussion

[Adrian Noland]

Hello, 
I'm starting to use LVM, and I would like to know the pros & cons of
using a different LE size other than the 4mb default. What kind of
performance issues are there with different size LE's? I saw a *very*
brief discussion in one of the docs (not the HOWTO), but cant find the
reference now.
Thanks,
Adrian

=====
"Palm Pilots are the Pet Rocks of the portable computing world"-Dan East

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Re: [linux-lvm] LE discussion

[Adrian Noland]

Thought I would qualify a little bit more.... I'm planning on using
this box as an all-purpose server HTTP/PHP/DNS/SMTP/SQL etc... So, my
question is in this context. Thanks again.
--- Adrian Noland <anoland@yahoo.com> wrote:
> Hello, 
> I'm starting to use LVM, and I would like to know the pros & cons of
> using a different LE size other than the 4mb default. What kind of
> performance issues are there with different size LE's? I saw a *very*
> brief discussion in one of the docs (not the HOWTO), but cant find
> the
> reference now.
> Thanks,
> Adrian
> 
> =====
> "Palm Pilots are the Pet Rocks of the portable computing world"-Dan
> East
> 
> __________________________________________________
> Do You Yahoo!?
> Send your FREE holiday greetings online!
> http://greetings.yahoo.com
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html

=====
"Palm Pilots are the Pet Rocks of the portable computing world"-Dan East

__________________________________________________
Do You Yahoo!?
Send your FREE holiday greetings online!
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Re: [linux-lvm] LE discussion

[Adrian Head]

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Hash: SHA1

The only mention I have seen about this topic is in the mail archives:
http://marc.theaimsgroup.com/?l=linux-lvm&m=99965651611876&w=2

On Thu, 3 Jan 2002 14:08, Adrian Noland wrote:
> Thought I would qualify a little bit more.... I'm planning on using
> this box as an all-purpose server HTTP/PHP/DNS/SMTP/SQL etc... So, my
> question is in this context. Thanks again.
>
> --- Adrian Noland <anoland@yahoo.com> wrote:
> > Hello,
> > I'm starting to use LVM, and I would like to know the pros & cons of
> > using a different LE size other than the 4mb default. What kind of
> > performance issues are there with different size LE's? I saw a *very*
> > brief discussion in one of the docs (not the HOWTO), but cant find
> > the
> > reference now.
> > Thanks,
> > Adrian
> >

- -- 
Adrian Head

(Public Key available on request.)
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Re: [linux-lvm] LE discussion

[Heinz J . Mauelshagen]

On Thu, Jan 03, 2002 at 02:28:21PM +1000, Adrian Head wrote:
> The only mention I have seen about this topic is in the mail archives:
> http://marc.theaimsgroup.com/?l=linux-lvm&m=99965651611876&w=2

I added something to the vgcreate(8) man page in CVS already.

> 
> On Thu, 3 Jan 2002 14:08, Adrian Noland wrote:
> > Thought I would qualify a little bit more.... I'm planning on using
> > this box as an all-purpose server HTTP/PHP/DNS/SMTP/SQL etc... So, my
> > question is in this context. Thanks again.
> >
> > --- Adrian Noland <anoland@yahoo.com> wrote:
> > > Hello,
> > > I'm starting to use LVM, and I would like to know the pros & cons of
> > > using a different LE size other than the 4mb default. What kind of
> > > performance issues are there with different size LE's? I saw a *very*
> > > brief discussion in one of the docs (not the HOWTO), but cant find
> > > the
> > > reference now.
> > > Thanks,
> > > Adrian
> > >
> 
> -- 
> Adrian Head
> 
> (Public Key available on request.)
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html

-- 

Regards,
Heinz    -- The LVM Guy --

*** 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@Sistina.com                           +49 2626 141200
                                                       FAX 924446
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Re: [linux-lvm] LE discussion

[Andreas Dilger]

On Jan 02, 2002  19:48 -0800, Adrian Noland wrote:
> I'm starting to use LVM, and I would like to know the pros & cons of
> using a different LE size other than the 4mb default. What kind of
> performance issues are there with different size LE's? I saw a *very*
> brief discussion in one of the docs (not the HOWTO), but cant find the
> reference now.

LE size will not likely affect performance, because they are so large.
The only reason for using larger LE size is if you want to have very
large LVs.  With the default 4MB LE size, you have a maximum LV size
of 256GB.  With a 16MB LE size, you have a max LV size of 1TB (which
is the largest that Linux will reliably support at present).  If you
expect to increase the size of a particular LV more than that in the
future (when Linux supports it), scale your LE size accordingly.

Note that you waste about 1.5 LEs of space per PV with the current
LVM tools, so you don't want to over do the LE size.

Cheers, Andreas
--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://www-mddsp.enel.ucalgary.ca/People/adilger/