munin-contrib/plugins/disk/btrfs_device_stats

#!/usr/bin/env python3


"""
=pod

=head1 NAME

btrfs_device_stats - Script to monitor btrfs device statistics

=head1 CONFIGURATION

Simply create a symlink in your plugins directory like with any other plugin.
Must be run as root.

 [btrfs_device_stats]
 user root

=head2 DEFAULT CONFIGURATION

=head1 BUGS

=head1 AUTHOR

2019, HaseHarald

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf

=head1 LICENSE

LGPLv3

=cut
"""


# This file contains a munin-plugin to gather btrfs statistics per device.
#
# This is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this plugin.  If not, see <http://www.gnu.org/licenses/>.


import btrfs
import sys


def munin_config(fs):
    fsid = str(fs.fsid).replace('-', '_')
    print("multigraph btrfs_device_stats_" + fsid)
    print("graph_args --base 1000 -l 0")
    print("graph_vlabel total btrfs attribute value")
    print("graph_title btrfs total device stats for " + fs.path)
    print("graph_category disk")
    print("graph_info This graph shows the total stats of devices used by btrfs")

    print("corruption_errs_total.label Corruption Errors")
    print("flush_errs_total.label Flush Errors")
    print("generation_errs_total.label Generation Errors")
    print("read_errs_total.label Read Errors")
    print("write_errs_total.label Write Errors")
    print("nr_items_total.label Nr. of Items")
    print("flags_total.label Nr. of Flags")

    print("")

    devices = fs.devices()
    for this_device in devices:
        this_dev_info = fs.dev_info(this_device.devid)
        this_dev_name = this_dev_info.path.replace('/dev/', '')
        print("multigraph btrfs_device_stats_" + fsid + "." + str(this_device.devid))
        print("graph_args --base 1000 -l 0")
        print("graph_vlabel btrfs attribute value")
        print("graph_title btrfs device stats for " + this_dev_name)
        print("graph_category disk")
        print("graph_info This graph shows stats of devices used by btrfs")

        print("corruption_errs.label Corruption Errors")
        print("corruption_errs.warming 1")
        print("flush_errs.label Flush Errors")
        print("flush_errs.warming 1")
        print("generation_errs.label Generation Errors")
        print("generation_errs.warming 1")
        print("read_errs.label Read Errors")
        print("read_errs.warming 1")
        print("write_errs.label Write Errors")
        print("write_errs.warming 1")
        print("nr_items.label Nr. of Items")
        print("flags.label Nr. of Flags")
        print("flags.warming 1")

        print("")


def munin_values(fs):
    corruption_errs_total = 0
    flush_errs_total = 0
    generation_errs_total = 0
    read_errs_total = 0
    write_errs_total = 0
    nr_items_total = 0
    flags_total = 0

    fsid = str(fs.fsid).replace('-', '_')
    devices = fs.devices()

    for this_device in devices:
        this_dev_stat = fs.dev_stats(this_device.devid, False)

        corruption_errs = this_dev_stat.corruption_errs
        flush_errs = this_dev_stat.flush_errs
        generation_errs = this_dev_stat.generation_errs
        read_errs = this_dev_stat.read_errs
        write_errs = this_dev_stat.write_errs
        nr_items = this_dev_stat.nr_items
        flags = this_dev_stat.flags

        corruption_errs_total = corruption_errs_total + corruption_errs
        flush_errs_total = flush_errs_total + flush_errs
        generation_errs_total = generation_errs_total + generation_errs
        read_errs_total = read_errs_total + read_errs
        write_errs_total = write_errs_total + write_errs
        nr_items_total = nr_items_total + nr_items
        flags_total = flags_total + flags

        print("multigraph btrfs_device_stats_" + fsid + "." + str(this_device.devid))

        print("corruption_errs.value " + str(corruption_errs))
        print("flush_errs.value " + str(flush_errs))
        print("generation_errs.value " + str(generation_errs))
        print("read_errs.value " + str(read_errs))
        print("write_errs.value " + str(write_errs))
        print("nr_items.value " + str(nr_items))
        print("flags.value " + str(flags))

        print("")

    print("multigraph btrfs_device_stats_" + fsid)

    print("corruption_errs_total.value " + str(corruption_errs_total))
    print("flush_errs_total.value " + str(flush_errs_total))
    print("generation_errs_total.value " + str(generation_errs_total))
    print("read_errs_total.value " + str(read_errs_total))
    print("write_errs_total.value " + str(write_errs_total))
    print("nr_items_total.value " + str(nr_items_total))
    print("flags_total.value " + str(flags_total))

    print("")


def main():
    for path in btrfs.utils.mounted_filesystem_paths():
        with btrfs.FileSystem(path) as fs:
            if len(sys.argv) > 1 and sys.argv[1] == "config":
                munin_config(fs)
            else:
                munin_values(fs)


if __name__ == "__main__":
    main()

exit(0)