[Linux-cluster] tmpfs on top of GFS

[Bryn M. Reeves]

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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
> 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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