47 lines
1.3 KiB
Smarty
47 lines
1.3 KiB
Smarty
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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{{/*
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Copyright 2018 OpenStack Foundation.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/}}
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#NOTE(portdirect): this is a simple approximation of https://ceph.com/pgcalc/
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import math
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import sys
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replication = int(sys.argv[1])
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number_of_osds = int(sys.argv[2])
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percentage_data = float(sys.argv[3])
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target_pgs_per_osd = int(sys.argv[4])
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raw_pg_num_opt = target_pgs_per_osd * number_of_osds \
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* (math.ceil(percentage_data) / 100.0) / replication
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raw_pg_num_min = number_of_osds / replication
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if raw_pg_num_min >= raw_pg_num_opt:
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raw_pg_num = raw_pg_num_min
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else:
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raw_pg_num = raw_pg_num_opt
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max_pg_num = int(math.pow(2, math.ceil(math.log(raw_pg_num, 2))))
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min_pg_num = int(math.pow(2, math.floor(math.log(raw_pg_num, 2))))
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if min_pg_num >= (raw_pg_num * 0.75):
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print min_pg_num
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else:
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print max_pg_num
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