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 laterIBM 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
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