1. System Overview
  2. What's New in Oracle Exadata Database Machine
  3. New Features for Oracle Exadata System Software Release 11.x
  4. What's New in Oracle Exadata Database Machine 11g Release 2 (11.2.3.3.1)
  5. Oracle Exadata Storage Server I/O Timeout Threshold

10.1.3 Oracle Exadata Storage Server I/O Timeout Threshold

The I/O timeout threshold can be configured for Oracle Exadata Storage Servers. Storage server I/O that takes longer than the defined threshold is canceled. Oracle Automatic Storage Management (Oracle ASM) redirects the I/O to another mirror copy of the data. Any write I/Os issued to the last valid mirror copy of the data are not canceled, even if the timeout threshold is exceeded.

Setting the timeout threshold too low can negatively impact system performance. Oracle recommends reviewing the Automatic Workload Repository (AWR) reports of peak I/O loads, and setting the threshold value to a value higher than the peak I/O latency with sufficient safety margin.

Minimum software: Oracle Database 11g Release 2 (11.2) release Monthly Database Patch For Exadata (June 2014 - 11.2.0.4.8). The same release is required for Oracle Grid Infrastructure.

See Also:

Oracle Exadata System Software User's Guide for additional information about the ALTER CELL I/O threshold timeout attribute

Parent topic: What's New in Oracle Exadata Database Machine 11g Release 2 (11.2.3.3.1)