Tobias,
I'd like to amend this to be even more clear about the performance:
# The directory where the system stores files and directories that
# should be shared with other Matterhorn nodes. This is usually
# a networked file location. This location should provide hard-linking
# functionality, and provide large amounts of disk space. See [ref]
# for an estimate.
#
# In the case of a single machine install, the setting may be left as
# is.
org.opencastproject.storage.shared.dir=${java.io.tmpdir}/shared
# The directory where the system stores files that are unique to
# this particular node within a Matterhorn cluster. This directory
# will store temporary files as well as persistent ones, so chose a
# place that is persistent between reboots.
#
#
org.opencastproject.storage.local.dir=${java.io.tmpdir}/${org.opencastproject.server.hostname}
The most important part of this is indicating which one needs to store
a lot of space versus a little space. And the hard linking issue.
Ideally we would include a link to the wiki right inline in the
configuration file, this would have helped out our systems group a lot.
Chris
> 1) Introduce two distinct variables for local and shared storage.
>
> # The directory where the system stores files and directories that
> should be shared with other Matterhorn # nodes within the same
> cluster for performance and space saving reasons. #
> # Note that by default, the directory points to each node's
> ${java.io.tmpdir}/shared directory, which should # be changed to a
> mounted filesystem that is shared between multiple Matterhorn nodes.
> In the case of a # one box install, the setting may be left as is.
> org.opencastproject.storage.shared.dir=${java.io.tmpdir}/shared
>
> # The directory where the system stores files that are unique to
> every node within a Matterhorn cluster. #
> # Note that this directory will store temporary files as well as
> persistent ones, so make sure to chose # a place that is persistent
> between reboots.
> org.opencastproject.storage.local.dir=${java.io.tmpdir}/${org.opencastproject.server.hostname}
>
> 2) Use these two variables in the appropriate places.
>
> The new variables will be used for default values of potentially
> shared places (workspace, working file repository) as well as
> decidedly local (read: per node) directories such as the search
> indexes.
>
> e. g
> org.opencastproject.workspace.rootdir=${org.opencastproject.storage.shared.dir}/workspace
> org.opencastproject.workingfiles.rootdir=${org.opencastproject.storage.shared.dir}/files
>
> and
> org.opencastproject.search.solr.dir=${org.opencastproject.storage.local.dir}/searchindex
> ...
>
> 3) Remove the existing (and no longer used) variable
> org.opencastproject.storage.dir
>
> This variable needs to be removed both from config.properties itself
> as well as from some parts of the code. This certainly sounds like
> work, but having adopter installs that screw up their installation
> because they are overwriting search indexes because the went to the
> same shared storage location is not helpful for the project.
>
> Tobias
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>
>
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--
Christopher Brooks, BSc, MSc
ARIES Laboratory, University of Saskatchewan
Web: http://www.cs.usask.ca/~cab938
Phone: 1.306.966.1442
Mail: Advanced Research in Intelligent Educational Systems Laboratory
Department of Computer Science
University of Saskatchewan
176 Thorvaldson Building
110 Science Place
Saskatoon, SK
S7N 5C9
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