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本帖最后由 andkylee 于 2010-02-01 18:14 编辑
主要取决于存储的I/O吧,还有网络的带宽。记得以前在我们公司的DS4500上是2G一分钟
zq5143 发表于 2010-02-01 17:33 ![]()
跟网络的带宽没有关系吧?
我只备份到本机。不牵涉到网络传输啊!
前些日子和oracle-dba讨论过这个问题。
sybase中好像没有通道这个概念。参数中我只找到number of large i/o buffers
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The number of large i/o buffers parameter sets the number of allocation unit-sized buffers reserved for performing large I/O for certain Adaptive Server utilities. These large I/O buffers are used primarily by the load database command, which uses one buffer to load the database, regardless of the number of stripes it specifies. load database then uses up to 32 buffers to clear the pages for the database it is loading. These buffers are not used by load transaction. To perform more than six load database commands concurrently, configure one large I/O buffer for each load database command.
create database and alter database use these buffers for large I/O while clearing database pages. Each instance of create database or load database can use up to 32 large I/O buffers.
These buffers are also used by disk mirroring and by some dbcc commands.
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似乎和dump database没有”多少“关系。
dump database 的命令语法中有:stripe on 和 blocksize,其中blocksize覆盖转储设备的缺省块大小,要达到最佳性能,将块大小调整为2的幂次方,如 65536,131072,262166.
stripe on是附加的转储设备,最多能用32个设备。
感觉sybase中远没有达到通道这个概念。假如磁盘有多个控制器的话,应该不会高效利用。
一个不错的话题,欢迎高手解答。 |
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