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Monitor how many (virtual) tapes are left available in Datadomain
Thursday - Mar 29th 2012 - by - (0 comments)

As of today there's only one Nagios plugin available to check a Datadomain storage (check_dd.pl, written by Pierre Gremaud back in January 2008). It allows to check the Datadomain host for used disk space and for triggered alerts.

This is good so far but backups can still fail, when there are no virtual tapes left/when all virtual tapes are 100% used (even when there is still a lot of disk space left).

It is actually quite easy to monitor the status for available tapes as well, the important SNMP OID is .1.3.6.1.4.1.19746.1.11.2.4.1.1.7:

# snmpwalk -v 1 -c public mydatadomainhost .1.3.6.1.4.1.19746.1.11.2.4.1.1.7
SNMPv2-SMI::enterprises.19746.1.11.2.4.1.1.7.0 = STRING: "100.0"
SNMPv2-SMI::enterprises.19746.1.11.2.4.1.1.7.1 = STRING: "100.0"
SNMPv2-SMI::enterprises.19746.1.11.2.4.1.1.7.2 = STRING: "100.0"
SNMPv2-SMI::enterprises.19746.1.11.2.4.1.1.7.3 = STRING: "100.0"
SNMPv2-SMI::enterprises.19746.1.11.2.4.1.1.7.4 = STRING: "100.0"
SNMPv2-SMI::enterprises.19746.1.11.2.4.1.1.7.5 = STRING: "100.0"
SNMPv2-SMI::enterprises.19746.1.11.2.4.1.1.7.6 = STRING: "100.0"
SNMPv2-SMI::enterprises.19746.1.11.2.4.1.1.7.7 = STRING: "100.0"
SNMPv2-SMI::enterprises.19746.1.11.2.4.1.1.7.8 = STRING: "100.0"
SNMPv2-SMI::enterprises.19746.1.11.2.4.1.1.7.9 = STRING: "100.0"
SNMPv2-SMI::enterprises.19746.1.11.2.4.1.1.7.10 = STRING: "100.0"
SNMPv2-SMI::enterprises.19746.1.11.2.4.1.1.7.11 = STRING: "100.0"
SNMPv2-SMI::enterprises.19746.1.11.2.4.1.1.7.12 = STRING: "100.0"
SNMPv2-SMI::enterprises.19746.1.11.2.4.1.1.7.13 = STRING: "1.6"
...

This OID shows the utilization in percent of all virtual tapes - yes, the list can be long! With this list one can calculate the amount of tapes left available for backups.

I quickly wrote a small plugin (check_dd_vtapes.sh) which checks for the virtual tapes left available for backups/usage:

# ./check_dd_vtapes.sh --help
check_dd_vtapes.sh (c) 2012 Claudio Kuenzler published under GPL license

Usage: ./check_dd_vtapes.sh -H host [-C community] -w warning -c critical

Requirements: snmpwalk, grep, awk, sed


Options:   -H hostname (name or IP address of your Datadomain)
           -C Name of SNMP community to be used (default is public)
           -w Warning Threshold (warning alert when only number of tapes are left available)
           -c Critical Threshold (critical alert when only number of tapes are left available)

Note: The plugin checks for the available virtual tapes left. So thresholds must be smaller than the actual available tapes.

Example: ./check_dd_vtapes.sh -H datadomain01 -C public -w 20 -c 5
This checks if at least 20 virtual tapes are available. If there are only 20 or less tapes left, a warning alert will be issued.



# ./check_dd_vtapes.sh -H mydatadomainhost -w 600 -c 550
DataDomain CRITICAL. 524 virtual tapes are available. 476 are 100% used.|ddtapes=524;476

As this is a very small plugin, I won't create a dedicated page for it.
You may DOWNLOAD THE PLUGIN check_dd_vtapes.sh HERE <- link. Enjoy.

In case you want to create graphs with Nagiosgraph, here's the map entry:

# Service Type: check_dd_vtapes.sh
# Regex by Claudio Kuenzler
# Output: 524 virtual tapes are available. 476 are 100% used.
# Perfdata: ddtapes=524;476
/perfdata:ddtapes=(\d+);(\d+)/
and push @s, [vtapes,
     ['available', GAUGE, $1 ],
     ['full', GAUGE, $2 ] ];

 

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