[Linux-cluster] Gfs_data vs gfs_journal

[Cahill, Ben M]

Oops, based on Michael's response, I realized that mine might be not
quite right.  Both data and journal *space* are necessary, but the
journals can be created, by default, within the filesystem device, with
no need for gfs_journal entry in config file.

BTW, OpenGFS has supported external journals for over a year at this
point ... would this be a useful feature for GFS?

-- Ben --

Opinions are mine, not Intel's

> -----Original Message-----
> From: linux-cluster-bounces at redhat.com 
> [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Cahill, Ben M
> Sent: Wednesday, July 07, 2004 11:07 AM
> To: linux-cluster at redhat.com
> Subject: RE: [Linux-cluster] Gfs_data vs gfs_journal
> 
> They are both necessary.
> 
> gfs_data is the device/partition for filesystem data (i.e. files and
> on-disk metadata).
> 
> Each node in the cluster also needs a separate journal 
> device/partition
> in which to redundantly record metadata, to enable the filesystem to
> recover gracefully from node failure/crash.
> 
> There's some documentation about this in the OpenGFS project:
> 
> opengfs.sourceforge.net/docs.php
> 
> CAUTION:  OpenGFS is *not* the same as current RedHat GFS; many things
> (e.g. lock protocols) are different ... but the basic idea is 
> the same.
> See WHATIS-OpenGFS, and HOWTO-generic, just to see if they help you
> understand.  But remember to rely on current RedHat GFS docs 
> for current
> installation, components, and capabilities info.
> 
> -- Ben --
> 
> Opinions are mine, not Intel's
> 
> > -----Original Message-----
> > From: linux-cluster-bounces at redhat.com 
> > [mailto:linux-cluster-bounces at redhat.com] On Behalf Of 
> Richard Mayhew
> > Sent: Wednesday, July 07, 2004 6:24 AM
> > To: Discussion of clustering software components including GFS
> > Subject: [Linux-cluster] Gfs_data vs gfs_journal
> > 
> > Hi,
> > 
> > Could some one explain or point me in the right direction in the
> > differences between gfs_data and gfs_journal in the pool 
> config file.
> > 
> > Which is the better option, and why?
> > 
> > Thanks
> > Richard.
> > 
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> > 
> > 
> 
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