[linux-lvm] what's different between LVM 2 and LVM 1

[linux-lvm] what's different between LVM 2 and LVM 1

[lilha]

I am puzzled what's different between LVM 2 and LVM 1
and I can't find any doc or introduction about the LVM2.

who is kind to tell me what is LVM2,
and why i should use LVM2 replace of lvm1?
and what's the future of LVM1? LVM1 will be discarded?

TIA for your help and sorry for my poor English.

Echo

Re: [linux-lvm] what's different between LVM 2 and LVM 1

[Joe Thornber]

On Fri, Aug 30, 2002 at 02:50:03PM +0800, lilha@legend.com.cn wrote:
> I am puzzled what's different between LVM 2 and LVM 1
> and I can't find any doc or introduction about the LVM2.
> 
> who is kind to tell me what is LVM2,
> and why i should use LVM2 replace of lvm1?

LVM2 is the next version of LVM that has a couple of goals:

i) A simpler more extensible kernel driver.  This driver, called
device-mapper, is already in the -ac series of 2.4 kernels.  Hopefully
device-mapper will replace the LVM1 driver completely in 2.[56].

ii) Ability to more easily support the new features we want to put in.
ATM we're concentrating on reproducing the functionality of LVM1,
though a couple of new features (eg. writeable/fast snapshots) have
crept in.

> and what's the future of LVM1? LVM1 will be discarded?

LVM1.0.x is the stable branch and will continue to be maintained by
Heinz for the foreseeable future (at least while people are using 2.4
kernels).  No new features will be added.

LVM1.1.x was an experimental/development branch, and will not be taken
further.

- Joe

Re: [linux-lvm] what's different between LVM 2 and LVM 1

[Pierrick PONS]

> On Fri, Aug 30, 2002 at 02:50:03PM +0800, lilha@legend.com.cn wrote:
> > I am puzzled what's different between LVM 2 and LVM 1
> > and I can't find any doc or introduction about the LVM2.
> > 
> > who is kind to tell me what is LVM2,
> > and why i should use LVM2 replace of lvm1?
> 
> LVM2 is the next version of LVM that has a couple of goals:
> 
> i) A simpler more extensible kernel driver.  This driver, called
> device-mapper, is already in the -ac series of 2.4 kernels.  Hopefully
> device-mapper will replace the LVM1 driver completely in 2.[56].
> 
> ii) Ability to more easily support the new features we want to put in.
> ATM we're concentrating on reproducing the functionality of LVM1,
> though a couple of new features (eg. writeable/fast snapshots) have
> crept in.
> 

just a stupid question :
Why does LVM2 was not a version of lvm so that we just had to upgrade LVM ?

If LVM2 is just an upgrade of LVM1, why couldn't you continue with lvm-xxxxx ?

It should have been less confusing and easier to upgrade. 

Sorry if it is abolutely stupid.

I'm using LVM1 and it works fine for me on a debian potato with a 2.4.18 
kernel with hardware RAID5 . Thank you for your work.


Pierrick

Re: [linux-lvm] what's different between LVM 2 and LVM 1

[Joe Thornber]

On Fri, Aug 30, 2002 at 11:24:03AM +0200, Pierrick PONS wrote:
> just a stupid question :
> Why does LVM2 was not a version of lvm so that we just had to upgrade LVM ?

You will be able to upgrade from LVM1.

> If LVM2 is just an upgrade of LVM1, why couldn't you continue with lvm-xxxxx ?

Because LVM2 is a complete rewrite, and we wanted to avoid confusion
between the two products.  If you look you will find that the LVM2
tools currently return a version number of 1.95.x.

- Joe

Re: [linux-lvm] what's different between LVM 2 and LVM 1

[lilha]

Thanks for your explanation.
but i'm still puzzled why i should use LVM2£¿
your explanation can't persuade me and i can't persuade my leader too.
is there any documents to introduce the features of LVM2£¿