Transient aio exhaustion causes multipath errors

(Doc ID 1505370.1)

Last updated on NOVEMBER 14, 2012

Applies to:

Linux OS - Version Oracle Linux 5.5 and later
Linux x86
Linux x86-64

Symptoms

The error message "io_setup failed" is sometimes visible in the output from "multipath-ll", and the associated paths are listed with state 'faulty' in the topology section, as follows:

pdcnap901_mnhprdb_dta01 (360a98000646743332f4a6b374f437356) dm-32 NETAPP,LUN
[size=700G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 3:0:1:2   sdd  8:48    [active][faulty]
 \_ 5:0:7:2   sdfb 129:208 [active][faulty]
 \_ 3:0:7:2   sdhh 133:112 [active][faulty]
 \_ 5:0:4:2   sdu  65:64   [active][faulty]
\_ round-robin 0 [prio=2][enabled]
 \_ 3:0:2:2   sdbc 67:96   [active][ready]
 \_ 5:0:5:2   sdbv 68:144  [active][ready]
 \_ 5:0:6:2   sddy 128:0   [active][faulty]
 \_ 3:0:6:2   sdge 131:160 [active][faulty]

This is especially common on Fibre-connected NetApp storage.

Cause

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