[Linux-cluster] tmpfs on top of GFS

[Michael Will]

Whats the intent here? 

tmpfs is meant to be node-local temporary storage by design. What are
you trying to use it for?

Michael

-----Original Message-----
From: linux-cluster-bounces at redhat.com
[mailto:linux-cluster-bounces at redhat.com] On Behalf Of Lin Shen (lshen)
Sent: Thursday, January 11, 2007 3:45 PM
To: linux clustering
Subject: RE: [Linux-cluster] tmpfs on top of GFS

 

> -----Original Message-----
> From: linux-cluster-bounces at redhat.com 
> [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Bryn M. Reeves
> Sent: Thursday, January 11, 2007 2:50 PM
> To: linux clustering
> Subject: Re: [Linux-cluster] tmpfs on top of GFS
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Lin Shen (lshen) wrote:
> > If I mount a tmpfs filesystem on top of a GFS based root
> filesystem at
> > say /tmp, can I safely share the contents under /tmp among
> the nodes?
> > 
> > lin
> > 
> > --
> > Linux-cluster mailing list
> > Linux-cluster at redhat.com
> > https://www.redhat.com/mailman/listinfo/linux-cluster
> 
> Maybe I misunderstand your question, but tmpfs will not be able to 
> share its contents between nodes the way GFS does.
> 
> The tmpfs filesystem uses space available in the pagecache & swap 
> areas as a backing store instead of a dedicated block device.
> 
> Mounting it on top of a GFS root at /tmp is only going to be visible 
> on a single node. Each node can do that and have its own tmpfs storage

> available, but this won't make the /tmp mounts shared between the 
> cluster nodes.
> 
> See Documentation/filesystems/tmpfs.txt in the kernel sources for more

> details.
> 
> Kind regards,
> 
> Bryn.
> 
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I see. Can I use NFS to export tmpfs from one node to another then? Or
are there any other better ways to share a tmpfs among the nodes.

lin 

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