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hscan - Online in the Cloud

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This is the command hscan that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



hscan - Scan clusters via RAPI and save node/instance data


hscan [-p] [--no-headers] [-d path ] cluster...

hscan --version


hscan is a tool for scanning clusters via RAPI and saving their data in the input format
used by hbal(1) and hspace(1). It will also show a one-line score for each cluster
scanned or, if desired, the cluster state as show by the -p option to the other tools.

For each cluster, one file named cluster.data will be generated holding the node and
instance data. This file can then be used in hbal(1) or hspace(1) via the -t option. In
case the cluster name contains slashes (as it can happen when the cluster is a
fully-specified URL), these will be replaced with underscores.

The one-line output for each cluster will show the following:

Name The name of the cluster (or the IP address that was given, etc.)

Nodes The number of nodes in the cluster

Inst The number of instances in the cluster

BNode The number of nodes failing N+1

BInst The number of instances living on N+1-failed nodes

t_mem Total memory in the cluster

f_mem Free memory in the cluster

t_disk Total disk in the cluster

f_disk Free disk space in the cluster

Score The score of the cluster, as would be reported by hbal(1) if run on the generated
data files.

In case of errors while collecting data, all fields after the name of the cluster are
replaced with the error display.

Note: this output format is not yet final so it should not be used for scripting yet.


The options that can be passed to the program are as follows:

-p, --print-nodes
Prints the node status for each cluster after the cluster's one-line status
display, in a format designed to allow the user to understand the node's most
important parameters. For details, see the man page for htools(1).

-d path
Save the node and instance data for each cluster under path, instead of the current

-V, --version
Just show the program version and exit.


The exist status of the command will be zero, unless for some reason loading the input
data failed fatally (e.g. wrong node or instance data).

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