122 lines
3.5 KiB
Ruby
Executable File
122 lines
3.5 KiB
Ruby
Executable File
#!/usr/bin/env ruby
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#
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# Copyright (C) 2013 Red Hat, GmbH
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#
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# This file is released under the GPL
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#
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#
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# Script to calculate device-mapper thin privisioning
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# metadata device size based on pool, block size and
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# maximum expected thin provisioned devices.
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#
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require 'optparse'
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require 'pathname'
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#----------------------------------------------------------------
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$prg = Pathname.new($0).basename
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$btree_entrysize = 16
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$btree_nodesize = 4096
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def init_units
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units = Hash.new
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units[:chars] = "sKkMmGgTtPpEeZzYy"
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units[:strings] = [ 'sectors',
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'kilobytes', 'kibibytes', 'megabytes', 'mebibytes',
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'gigabytes', 'gibibytes', 'terabytes', 'tebibytes',
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'petabytes', 'pebibytes', 'exabytes', 'ebibytes',
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'zetabytes', 'zebibytes', 'yottabytes', 'yobibytes' ]
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units[:factors] = Array.new
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units[:factors][0] = 512
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1.step(8) do |e|
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units[:factors][(e - 1) * 2 + 1] = 1024**e
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units[:factors][(e - 1) * 2 + 2] = 1000**e
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end
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units
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end
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def check_opts(opts)
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abort "#{$prg} - 3 arguments required!" if opts.length < 3
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abort "#{$prg} - poolsize must be much larger than blocksize" if opts[:poolsize] < opts[:blocksize] * 16
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abort "#{$prg} - maximum number of thin provisioned devices must be > 0" if opts[:maxthins].nil? || opts[:maxthins] == 0
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end
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def to_sectors(size, units)
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unit_chars = units[:chars]
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a = size.split(/[#{unit_chars}]/)
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s = size.to_i.to_s
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abort "#{$prg} - only one unit character allowed!" if a.length > 1 || size.length - s.length > 1
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abort "#{$prg} - invalid unit specifier!" if s != a[0]
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idx = unit_chars.index(size[a[0].length])
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r = size.to_i * units[:factors][idx] / 512
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r
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end
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def parse_command_line(argv, units)
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opts = {}
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unit_chars = units[:chars]
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os = OptionParser.new do |o|
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o.banner = "Thin Provisioning Metadata Size Calculator.\nUsage: #{$prg} [opts]"
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o.on('-b', '--blocksize BLOCKSIZE', String,
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"Block size, ie. allocation unit size for thin provisioned devices.") do |bs|
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opts[:blocksize] = to_sectors(bs, units)
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end
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o.on('-s', '--poolsize SIZE', String, "Size of the pool device.") do |ps|
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opts[:poolsize] = to_sectors(ps, units)
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end
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o.on('-m', '--maxthins MAXTHINS', Integer, "Size of the pool device.") do |mt|
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opts[:maxthins] = mt
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end
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o.on('-u', '--units [skKmMgGtTpP]', String, "Output unit specifier.") do |u|
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if u =~ /[#{unit_chars}]/
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opts[:units] = u
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else
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abort "#{$prg} - output unit specifier invalid."
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end
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end
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o.on('-n', '--numeric-only', "Output numeric value only.") do
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opts[:numeric] = true || nil
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end
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o.on('-h', '--help', "Outout this help.") do
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puts o
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exit
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end
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end
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begin
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os.parse(argv)
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rescue OptionParser::ParseError => e
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abort "#{$prg} #{e}\n#{$prg} #{os}"
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end
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check_opts(opts)
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opts
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end
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def entries_per_node
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btree_node_headersize = 64
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($btree_nodesize - btree_node_headersize) / $btree_entrysize
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end
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def estimated_result(opts, units)
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idx = opts[:units] ? units[:chars].index(opts[:units]) : 0
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r = 1.0 + ((opts[:poolsize] / opts[:blocksize] / entries_per_node) + opts[:maxthins]) * 512 / 8
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r /= units[:factors][idx]
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tmp = "%.2f" % r
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# FIXME: avoid zero decimal places
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r = tmp.to_f > 0.0 ? tmp : "%.4e" % r
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r = "#{$prg} estimated metadata area size is #{r} #{units[:strings][idx]}." if !opts[:numeric]
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r
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end
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#----------------------------------------------------------------
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# Main
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units = init_units
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puts estimated_result(parse_command_line(ARGV, units), units)
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