[linux-lvm] question about LVM kernel module - mirroring

[linux-lvm] question about LVM kernel module - mirroring

[Luca Lavorante]

Hi everybody, I am new to the list and hope you will excuse my (perhaps) 
silly questions.

1) I have seen in the LVM documentation that the program is divided into:

   - A kernel module
   - a set o binaries (commands etc.)

I´d like to know whether it is possible to use LVM WITHOUT a kernel 
module. I mean a deamon process. I´m asking that because sometimes I am 
not allowed to recompile the kernel on production machines.

2) How can I perform mirroring using LVM? I know the kernel can do that 
on local disks. Is it possible for the kernel of  two clustered machines 
to mirror two disks on an external storage?
I am working on a HA cluster.

Thanks for your attention

        Luca Lavorante

Re: [linux-lvm] question about LVM kernel module - mirroring

[Joe Thornber]

On Fri, Oct 11, 2002 at 08:33:36AM -0300, Luca Lavorante wrote:
> Hi everybody, I am new to the list and hope you will excuse my (perhaps) 
> silly questions.
> 
> 1) I have seen in the LVM documentation that the program is divided into:
> 
>   - A kernel module
>   - a set o binaries (commands etc.)
> 
> I?d like to know whether it is possible to use LVM WITHOUT a kernel 
> module.

No.

> 2) How can I perform mirroring using LVM? I know the kernel can do that 
> on local disks. Is it possible for the kernel of  two clustered machines 
> to mirror two disks on an external storage?

LVM doesn't support mirroring ATM.  Try the software raid driver (md).

- Joe

Re: [linux-lvm] question about LVM kernel module - mirroring

[Luca Lavorante]

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Joe, Thanks for your reply.

      Luca

Joe Thornber wrote:

>On Fri, Oct 11, 2002 at 08:33:36AM -0300, Luca Lavorante wrote:
>  
>
>>Hi everybody, I am new to the list and hope you will excuse my (perhaps) 
>>silly questions.
>>
>>1) I have seen in the LVM documentation that the program is divided into:
>>
>>  - A kernel module
>>  - a set o binaries (commands etc.)
>>
>>I?d like to know whether it is possible to use LVM WITHOUT a kernel 
>>module.
>>    
>>
>
>No.
>
>  
>
>>2) How can I perform mirroring using LVM? I know the kernel can do that 
>>on local disks. Is it possible for the kernel of  two clustered machines 
>>to mirror two disks on an external storage?
>>    
>>
>
>LVM doesn't support mirroring ATM.  Try the software raid driver (md).
>
>- Joe
>
>_______________________________________________
>linux-lvm mailing list
>linux-lvm@sistina.com
>http://lists.sistina.com/mailman/listinfo/linux-lvm
>read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
>  
>


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re: [linux-lvm] question about LVM kernel module - mirroring

[Greg Freemyer]

 >>  2) How can I perform mirroring using LVM? I know the kernel can do that 
 >>  on local disks. Is it possible for the kernel of  two clustered machines 
 >>  to mirror two disks on an external storage?
 >>  I am working on a HA cluster.

 >>  Thanks for your attention

 >>  Luca Lavorante
Luca,

If you want to have only one node at a time have access to the data, then the heartbeat mailing list may be a better place to ask.  www.linux-ha.org  In particular look thru their archives.  The subject comes up often.

If you want both to be able to have simultaneous access, then there are 3 or 4 choices I think.  The only 3 I can think of offhand are Sistina's GFS, OpenGFS, and Oracles OCFS.  The latter 2 are open source and not quite production ready in my opinion.  Sistina has been selling their GFS as production ready for over a year..

Greg Freemyer