[Linux-cluster] tmpfs on top of GFS

[Lin Shen (lshen)]

> -----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
> 
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> 
> 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
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> 
> 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