[Linux-cluster] Gfs_data vs gfs_journal

[Cahill, Ben M]

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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