Slow IO Using ASM With SVM (Solaris Volume Manager) Mirrored Logical Volumes (Doc ID 603825.1)

Last updated on OCTOBER 31, 2016

Applies to:

Oracle Database - Enterprise Edition - Version 10.1.0.2 to 11.1.0.6 [Release 10.1 to 11.1]
Oracle Solaris on SPARC (64-bit)
Sun Solaris SPARC (64-bit)
Solaris Operating System (SPARC 64-bit)

Symptoms

Database performance was severely affected by excessive IO latencies, the database write times was observed to be > 80ms in some cases.
The following wait events show abnormally high values (>60ms) 

log file parallel write
db file parallel write
control file parallel write
log file sync

Changes

ASM was implemented over mirrored Logical Volumes.

Cause

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