[Linux-cluster] tmpfs on top of GFS

[Lin Shen (lshen)]

We have postgre running on our system, don't feel like getting in
another database. 

lin   

> -----Original Message-----
> From: linux-cluster-bounces at redhat.com 
> [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Michael Will
> Sent: Thursday, January 11, 2007 3:56 PM
> To: linux clustering
> Subject: RE: [Linux-cluster] tmpfs on top of GFS
> 
> That could be done with mysql's clustered in-memory database 
> mode without sharing anything through a filesystem - the 
> mysql daemons will communicate the data directly through tcpip.
> 
> -----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 3:53 PM
> To: linux clustering
> Subject: RE: [Linux-cluster] tmpfs on top of GFS
> 
>  We're trying to use it as an in-memory DB (for its speed), 
> but need to share the DB contents among nodes.
> 
> lin
> 
> > -----Original Message-----
> > From: linux-cluster-bounces at redhat.com 
> > [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Michael Will
> > Sent: Thursday, January 11, 2007 3:48 PM
> > To: linux clustering
> > Subject: RE: [Linux-cluster] tmpfs on top of GFS
> > 
> > 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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