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Oracle RAC - Oracle为什么不建议使用交叉线作为心跳线

原创 Linux操作系统 作者:tolywang 时间:2009-09-10 15:50:57 0 删除 编辑

Oracle不支持使用交叉线作为ClusterWare的内部连接, 这里的Not Support不是说交叉线不能用,而是说Oracle不建议这样做。

在Metalink上关于这方面的描述,摘录一下:

CROSS OVER CABLES ARE NOT SUPPORTED.
The requirement is to use a switch:

Detailed Reasons:
1) cross-cabling limits the expansion of RAC to two nodes
2) cross-cabling is unstable:
a) Some NIC cards do not work properly with it. They are not able to negotiate the DTE/DCE clocking, and will thus not function.
These NICS were made cheaper by assuming that the switch was going to have the clock. Unfortunately there is no way to know which NICs do not have that clock.
b) Media sense behaviour on various OS's (most notably Windows) will bring a NIC down when a cable is disconnected.
Either of these issues can lead to cluster instability and lead to ORA-29740 errors (node evictions).

Due to the benefits and stability provided by a switch, and their afforability ($200 for a simple 16 port GigE switch), and the expense and time related to dealing with issues when one does not exist, this is the only supported configuration.

实际上,交换机的引入是为了更高的扩展性和稳定性,这是合理的投入,在搭建RAC环境时值得投入。 

来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/35489/viewspace-614691/,如需转载,请注明出处,否则将追究法律责任。

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