[linux-lvm] Is there any help for external locking of LVM?

[linux-lvm] Is there any help for external locking of LVM?

[Kirby Zhou]

I am working for getting a alternative of built-in clustered locking.
clvmd cannot support large size cluster well, and cannot across VLAN.
In my opinion, a centralized locking mechanism is more suitable for
large-scale cluster.

If I just put locking_dir on a NFS volume with locking_type=1, can I use LVM
to share a storage across machine?
Or is there any document can guide me to write a new locking plug-in?

Regards,
   Kirby Zhou    
   from   SOHU-RD   +86-10-6272-8261

Re: [linux-lvm] Is there any help for external locking of LVM?

[Christine Caulfield]

Hiya

There's no documentation on writing locking plugins but it's fairly 
straightforward, in principle at least ;-)

Have a look at LVM2/lib/locking/no_locking.c and add your custom locking 
parts in there. You DO need to call the lvm libraries parts or nothing 
will happen.

If your locking library is generally useful I hope you will share it 
with the community.

Chrissie


On 23/08/10 05:17, Kirby Zhou wrote:
> I am working for getting a alternative of built-in clustered locking.
> clvmd cannot support large size cluster well, and cannot across VLAN.
> In my opinion, a centralized locking mechanism is more suitable for
> large-scale cluster.
>
> If I just put locking_dir on a NFS volume with locking_type=1, can I use LVM
> to share a storage across machine?
> Or is there any document can guide me to write a new locking plug-in?
>
> Regards,
>     Kirby Zhou
>     from   SOHU-RD   +86-10-6272-8261
>

Re: [linux-lvm] Is there any help for external locking of LVM?

[Kirby Zhou]

Thanks, and could you please think about my second question.

> If I just put locking_dir on a NFS volume with locking_type=1, can I use
LVM
> to share a storage across machine?

I see that file_locking do not provide query_resource function, is it safe
for me to do pvmove with NFS based locking file? And what does
query_resource should do?



  Regards
  Kirby Zhou


-----Original Message-----
From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com] On
Behalf Of Christine Caulfield
Sent: Monday, August 23, 2010 9:49 PM
To: linux-lvm@redhat.com
Subject: Re: [linux-lvm] Is there any help for external locking of LVM?

Hiya

There's no documentation on writing locking plugins but it's fairly 
straightforward, in principle at least ;-)

Have a look at LVM2/lib/locking/no_locking.c and add your custom locking 
parts in there. You DO need to call the lvm libraries parts or nothing 
will happen.

If your locking library is generally useful I hope you will share it 
with the community.

Chrissie


On 23/08/10 05:17, Kirby Zhou wrote:
> I am working for getting a alternative of built-in clustered locking.
> clvmd cannot support large size cluster well, and cannot across VLAN.
> In my opinion, a centralized locking mechanism is more suitable for
> large-scale cluster.
>
> If I just put locking_dir on a NFS volume with locking_type=1, can I use
LVM
> to share a storage across machine?
> Or is there any document can guide me to write a new locking plug-in?
>
> Regards,
>     Kirby Zhou
>     from   SOHU-RD   +86-10-6272-8261
>

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