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如何定制 DAOS Estimator(DAOSEST) 的间隔

2013-03-05 11:31:35| 分类： Domino服务器 | 标签： |举报 |字号大中小订阅

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有一位管理员想启用DAOS，可是DAOS Estimator 默认的值分别对应64K，1M，5M，中间的间隔有些大。

能否定制，缩短DAOSEST的采样间隔呢？

解决方法：
在DAOSEST程序所在的Domino服务器上添加notes.ini参数如下：（以KB为单位）
DAOSEST_BUCKETS=16,64,128,256,512,768,1024,2048,3072,4096

在测试环境再次运行DAOS Estimator工具，输出结果如下：

Summary:
Total DB's analyzed: 73
Total DB's skipped due to errors: 0
Total Size of NSF's Examined: 968.8 MB
Total Attachments found: 129
Total Duplicate Attachments found: 29
Estimated Size of DAOSified NSF's: 949.7 MB
Estimate Size of DAOS dir: 17.1 MB
Total Disk Savings: 2.0 MB
Compression Statistics:
None: 75
Huffman: 25
LZ1: 29
Huffman on LZ1 servers: 0
==============================================================================
| Size Distribution of All Attachments Found |
==============================================================================
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |        |
| 79 |            |
| 79 | |
| 79 |          |
| 79 | | 19 | |
| 79 | | 19 | |
| 79 | | 19 | |
| 79 | 14 | 8 | 19 | |
| 79 | 14 | 8 | 19 | |
| 79 | 14 | 8 | 19 | |
| 79 | 14 | 8 | 19 | 2 | 4 | 0 | 1 | 0 | 0 | 2 |
| | | | | | | | | | | |

==============================================================================
| 1.7% | 1.8% | 4.3% |16.2% | 4.5% |12.7% | 0.0% | 7.1% | 0.0% | 0.0% | 0.0% |
==============================================================================
|16 KB |64 KB |128 KB|256 KB|512 KB|768 KB| 1 MB | 2 MB | 3 MB | 4 MB |> 4 MB|
==============================================================================

- Histogram shows the number of attachments contained in each bucket.
- Percentages are the percent of total disk space of all attachments per bucket
DAOS Minimum Size versus number of NLO's and Disk Space:
0.0 KB will result in 129 .nlo files using 7.3 MB
16.0 KB will result in 50 .nlo files using 7.0 MB
64.0 KB will result in 36 .nlo files using 6.8 MB
128.0 KB will result in 28 .nlo files using 6.1 MB
256.0 KB will result in 9 .nlo files using 4.7 MB
512.0 KB will result in 7 .nlo files using 3.8 MB
768.0 KB will result in 3 .nlo files using 1.4 MB
1.0 MB will result in 3 .nlo files using 1.4 MB
2.0 MB will result in 2 .nlo files using 0.0 KB
3.0 MB will result in 2 .nlo files using 0.0 KB

根据最佳实践确定：
下限：按照最大节省空间*0.7=7.3*0.7=5.1
上限：按照最大节省空间*0.8=7.3*0.8=5.8

"DAOS入门门槛"设为256KB或128KB比较好。

如何定制 DAOS Estimator(DAOSEST) 的间隔 - mylotustips - mylotustips的博客

相关技术文档 #1418102：

标题：How to customize DAOSEST file attachment size
链接：http://www.ibm.com/support/docview.wss?uid=swg21418102

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