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Mod_wl_ohs Postdata File is Unlinked Before R/W/CLOSE Operations Causing High I/O in AIX 7.2+ Server Host (Doc ID 2952759.1)

Last updated on AUGUST 26, 2024

Applies to:

Oracle HTTP Server - Version 12.2.1.0.0 and later
IBM AIX on POWER Systems (64-bit)

Symptoms

Oracle HTTP Server mod_wl_ohs plugin opens postdata file for a post request then immediately unlinks the file before performing other operations such as read/write/close against the file.  This caused I/O performance issue for the AIX server.

truss snippet showing open/unlink

Changes

AIX OS Upgraded from 7.1 to 7.2.
AIX 7.2 introduced a new j2gt process one of the function is "zombie files" handling. 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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