今天又想起来， 读了几篇帖子， 了解了下 最新动态
新的Fast Dedup出了片文章， 提到了运行下面 命令可以先看看
行了，死心了，我这use case dedup ratio才 1.12
强烈建议想开dedup的都跑一下看， 收益率够高 就上
# zdb -S nas
Simulated DDT histogram:
bucket allocated referenced
______ ______________________________ ______________________________
refcnt blocks LSIZE PSIZE DSIZE blocks LSIZE PSIZE DSIZE
------ ------ ----- ----- ----- ------ ----- ----- -----
1 37.2M 8.79T 8.10T 8.14T 37.2M 8.79T 8.10T 8.14T
2 6.54M 949G 897G 910G 13.8M 1.93T 1.82T 1.85T
4 500K 32.0G 26.7G 29.2G 2.30M 136G 112G 124G
8 89.0K 1.72G 1021M 1.51G 917K 17.0G 9.91G 15.2G
16 27.2K 463M 302M 465M 562K 9.56G 6.29G 9.56G
32 10.4K 110M 76.8M 141M 456K 4.54G 3.20G 6.00G
64 3.05K 38.4M 27.3M 44.0M 241K 3.02G 2.14G 3.40G
128 76 1.04M 216K 703K 12.7K 173M 33.8M 115M
256 35 1.39M 119K 344K 11.9K 570M 45.1M 120M
512 14 31K 19K 112K 8.51K 21.4M 12.0M 68.0M
1K 3 3.50K 3.50K 24.0K 4.33K 5.43M 5.43M 34.6M
2K 2 129K 5K 16.0K 6.07K 509M 17.9M 48.5M
4K 1 128K 4K 7.99K 7.99K 1023M 32.0M 63.9M
Total 44.3M 9.75T 9.00T 9.06T 55.5M 10.9T 10.0T 10.1T
dedup = 1.12, compress = 1.08, copies = 1.01, dedup * compress / copies = 1.20
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FROM 124.207.188.194