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thin_metadata_size: allow for very small sizes

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This commit is contained in:
Heinz Mauelshagen 2013-06-24 13:52:46 +02:00
parent 6ff5e418eb
commit 2d74d47373
1 changed files with 7 additions and 7 deletions
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14
thin-provisioning/thin_metadata_size
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@ -41,25 +41,25 @@ def check_opts(opts)
abort "#{$prg} - maximum number of thin provisioned devices must be > 0" if opts[:maxthins].nil? || opts[:maxthins] == 0
end
def to_sectors(size, units)
def to_bytes(size, units)
a = size.split(/[#{units[:chars]}]/)
s = size.to_i.to_s
abort "#{$prg} - only one unit character allowed!" if a.length > 1 || size.length - s.length > 1
abort "#{$prg} - invalid unit specifier!" if s != a[0]
size.to_i * units[:factors][get_index(size[a[0].length], units)] / units[:bytes_per_sector]
size.to_i * units[:factors][get_index(size[a[0].length], units)]
end
def parse_command_line(argv, units)
opts = {}
os = OptionParser.new do |o|
o.banner = "Thin Provisioning Metadata Size Calculator.\nUsage: #{$prg} [opts]"
o.banner = "Thin Provisioning Metadata Device Size Calculator.\nUsage: #{$prg} [opts]"
o.on("-b", "--block-size BLOCKSIZE[#{units[:chars]}]", String,
"Block size of thin provisioned devices.") do |bs|
opts[:blocksize] = to_sectors(bs, units)
opts[:blocksize] = to_bytes(bs, units)
end
o.on("-s", "--pool-size SIZE[#{units[:chars]}]", String, "Size of pool device.") do |ps|
opts[:poolsize] = to_sectors(ps, units)
opts[:poolsize] = to_bytes(ps, units)
end
o.on("-m", "--max-thins #MAXTHINS", Integer, "Maximum sum of all thin devices and snapshots.") do |mt|
opts[:maxthins] = mt
@ -95,8 +95,8 @@ end
def estimated_result(opts, units)
idx = get_index(opts[:units], units)
# double-fold # of nodes, because they aren't fully populated in average
r = (1.0 + ((opts[:poolsize] / opts[:blocksize] / mappings_per_block) * 2 + opts[:maxthins])) * 8 * units[:bytes_per_sector] # in bytes!
r /= units[:factors][idx]
r = (1.0 + (2 * (opts[:poolsize] / opts[:blocksize] / mappings_per_block) + opts[:maxthins])) * 8 * units[:bytes_per_sector] # in bytes!
r /= units[:factors][idx] # in requested unit
tmp = "%.2f" % r
if tmp.to_f > 0.0
r = tmp.to_i.to_f == tmp.to_f ? tmp.to_i : tmp