Synnefo » snf-ganeti

.TH HSCAN 1 2009-03-23 htools "Ganeti H-tools"

.SH NAME

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

.SH SYNOPSIS

.B hscan

.B "[-p]"

.B "[--no-headers]"

.BI "[-d " path "]"

.I cluster...

.B hscan

.B --version

.SH DESCRIPTION

hscan is a tool for scanning clusters via RAPI and saving their data

in the input format used by

.BR hbal "(1) and " hn1 "(1)."

It will also show a one-line score for each cluster scanned or, if

desired, the cluster state as show by the \fB-p\fR option to the other

tools.

For each cluster, two files named \fIcluster\fB.instances\fR and

\fIcluster\fB.nodes\fR will be generated holding the instance and node

data. These files can then be used in \fBhbal\fR(1) or \fBhn1\fR(1)

via the \fB-i\fR and \fB-n\fR options.

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

.RS

.TP

.B Name

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

.TP

.B Nodes

The number of nodes in the cluster

.TP

.B Inst

The number of instances in the cluster

.TP

.B BNode

The number of nodes failing N+1

.TP

.B BInst

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

.TP

.B t_mem

Total memory in the cluster

.TP

.B f_mem

Free memory in the cluster

.TP

.B t_disk

Total disk in the cluster

.TP

.B f_disk

Free disk space in the cluster

.TP

.B Score

The score of the cluster, as would be reported by \fBhscan\fR(1) if

run on the generated data files.

.RE

In case of errors while collecting data, all fields after the name of

the cluster are replaced with the error display.

.B Note:

this output format is not yet final so it should not be used for

scripting yet.

.SH OPTIONS

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

.TP

.B -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 \fBhbal\fR(1).

.TP

.BI "-d " path

Save the node and instance data for each cluster under \fIpath\fR,

instead of the current directory.

.TP

.B -V, --version

Just show the program version and exit.

.SH EXIT STATUS

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).

.SH BUGS

The program does not check its input data for consistency, and aborts

with cryptic errors messages in this case.

The RAPI collection doesn't deal with non-\fBdrbd\fR instances, and

chokes on input data which has such instances.

.SH EXAMPLE

.in +4n

.nf

.RB "$ " "hscan cluster1"

Name     Nodes  Inst BNode BInst  t_mem  f_mem t_disk f_disk      Score

cluster1     2     2     0     0   1008    652    255    253 0.24404762

.RB "$ " "ls -l cluster1.*"

-rw-r--r-- 1 root root 163 2009-03-23 07:26 cluster1.instances

-rw-r--r-- 1 root root  90 2009-03-23 07:26 cluster1.nodes

.fi

.in

.SH SEE ALSO

.BR hbal "(1), " hn1 "(1), " ganeti "(7), " gnt-instance "(8), " gnt-node "(8)"