RMAN Backup Perfroms Poorly using Native Async IO (Doc ID 468598.1)

Last updated on OCTOBER 27, 2016

Applies to:

Oracle Server - Enterprise Edition - Version 10.2.0.3 and later
Linux x86-64

Symptoms

RMAN backups are running extremely slowly.
Native async IO is being used.
Tests of a backup validate confirm that most of the time is spent READING the input files.
If async io is simulated by using disk io slaves, then backup speed is very fast.

.

Cause

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