amplot - visualize the behavior of Amanda
amplot [ -c ] [ -e ] [ -g ] [ -l ] [ -p ] [ -t T ] amdump_files
Amplot reads an amdump output file that Amanda generates each run (e.g. amdump.1) and
translates the information into a picture format that may be used to determine how your
installation is doing and if any parameters need to be changed. Amplot also prints out
amdump lines that it either does not understand or knows to be warning or error lines and
a summary of the start, end and total time for each backup image.
Amplot is a shell script that executes an awk program (amplot.awk) to scan the amdump out-
put file. It then executes a gnuplot program (amplot.g) to generate the graph. The awk
program is written in an enhanced version of awk, such as GNU awk (gawk version 2.15 or
later) or nawk.
During execution, amplot generates a few temporary files that gnuplot uses. These files
are deleted at the end of execution.
See the amanda(8) man page for more details about Amanda.
-c Compress amdump_files after plotting.
-e Extend the X (time) axis if needed.
-g Direct gnuplot output directly to the X11 display (default).
-p Direct postscript output to file YYYYMMDD.ps (opposite of -g).
-l Generate landscape oriented output.
-t T Set the right edge of the plot to be T hours.
The amdump_files may be in various compressed formats (compress, gzip, pact, compact).
The figure is divided into a number of regions. There are titles on the top that show
important statistical information about the configuration and from this execution of
amdump. In the figure, the X axis is time, with 0 being the moment amdump was started.
The Y axis is divided into 5 regions:
QUEUES: How many backups have not been started, how many are waiting on space in
the holding disk and how many have been transferred successfully to tape.
%BANDWIDTH: Percentage of allowed network bandwidth in use.
HOLDING DISK: The higher line depicts space allocated on the holding disk to back-
ups in progress and completed backups waiting to be written to tape. The lower
line depicts the fraction of the holding disk containing completed backups waiting
to be written to tape including the file currently being written to tape. The
scale is percentage of the holding disk.
TAPE: Tape drive usage.
%DUMPERS: Percentage of active dumpers.
The idle period at the left of the graph is time amdump is asking the machines how much
data they are going to dump. This process can take a while if hosts are down or it takes
them a long time to generate estimates.
Olafur Gudmundsson email@example.com
Trusted Information Systems
formerly at University of Maryland, College Park
Reports lines it does not recognize, mainly error cases but some are legitimate lines the
program needs to be taught about.
amanda(8), amdump(8), gawk(1), nawk(1), awk(1), gnuplot(1), sh(1), compress(1), gzip(1)
4th Berkeley Distribution AMPLOT(8)