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@xxxxxxxxxx > [mailto:linux-cluster-bounces@xxxxxxxxxx] 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. > > -- > > Linux-cluster@xxxxxxxxxx > http://www.redhat.com/mailman/listinfo/linux-cluster > >
