Interstage Shunsaku Data Manager Troubleshooting - Microsoft(R) Windows(R) 2000/ Microsoft(R) Windows Server(TM) 2003 - - UNIX -

A.6.5 Degradation

The search will stop for several seconds when the search server fails due to the hardware fault. How to avoid this situation?

The auto recovery by degradation will be run when the hardware error occurs.

The degradation is a function that distributes data from the fault search server to the other servers when the error occurs. However, the data cannot be searched and updated (add, update, delete data) during the degradation. An operation can continue after the degradation is complete.

The degradation due to the hardware fault cannot be avoided.

The general operation of the degradation is as follows:

• For the case that the failure of the search server is detected due to the hardware fault
  the operation will be in a waiting status until the timeout occurs. Then, the degradation will be started after the time out.
  The value of the time out is specified at the SearcherWTimer parameter in the director environment file. The standard time is 180 seconds.
• For the case that the failure of the search server is detected due to the software error
  The error will be returned immediately when execute the search, and the degradation will be started.

For both cases, if the failover operation by alternative servers is operated, switch to the alternative servers at first.
The degradation will be started if the system fails to switch to the alternative servers.

Refer to Failover Function for Search Servers in the Operator's Guide for more information on the failover operations for degradation and alternative servers.