A fix is available
APAR status
Closed as program error.
Error description
On AIX 6.1 Technology Level 9 or AIX 7.1 Technology Level 3 or VIOS 2.2.3.x, there is a chance that a disk I/O error will occur when AIX still has valid paths to the device. This error will only be seen if the following conditions are true. 1. Disk is using the AIX default PCM. 2. Disk is using algorithm round_robin or shortest_queue 3. AIX is using either the 16Gb FC adapter or the 10Gb FCoE adapter to attach to the SAN. 4. There are errors in the SAN between the FC switch and the storage device. If the above conditions are met, there is a chance that AIX will fail a disk I/O even though there are remaining good paths to the storage device. When the I/O fails, there will be an error report entry with label SC_DISK_ERR3 and the first line of the "SENSE DATA" will end with 0200 0400 0000 0000.
Local fix
Problem summary
************************************************************* * USERS AFFECTED: * Systems running the 6100-09 Technology Level with * devices.common.IBM.mpio.rte at the 6.1.9.0 or 6.1.9.1 * level. ************************************************************* * PROBLEM DESCRIPTION: * On AIX 6.1 Technology Level 9 or AIX 7.1 Technology Level 3 * or VIOS 2.2.3.x, there is a chance that a disk I/O error * will occur when AIX still has valid paths to the device. * This error will only be seen if the following conditions * are true. * * 1. Disk is using the AIX default PCM. * 2. Disk is using algorithm round_robin or shortest_queue * 3. AIX is using either the 16Gb FC adapter or the 10Gb FCoE * adapter to attach to the SAN. * 4. There are errors in the SAN between the FC switch * and the storage device. * * If the above conditions are met, there is a chance that AIX * will fail a disk I/O even though there are remaining good * paths to the storage device. When the I/O fails, there * will be an error report entry with label SC_DISK_ERR3 and * the first line of the SENSE DATA will end with * 0200 0400 0000 0000. ************************************************************* * RECOMMENDATION: * Install APAR IV54907. * Prior to fix availability, an interim fix is available from * either * ftp://aix.software.ibm.com/aix/ifixes/iv54907/ * https://aix.software.ibm.com/aix/ifixes/iv54907/ *************************************************************
Problem conclusion
Modified that AIX default PCM to ensure it properly selects good paths when there are still good paths available.
Temporary fix
********* * HIPER * *********
Comments
6100-09 - use AIX APAR IV54907 6100-09 - use AIX APAR IV54907 6100-09 - use AIX APAR IV54907 6100-09 - use AIX APAR IV54907 7100-03 - use AIX APAR IV54905 7100-03 - use AIX APAR IV54905 7100-04 - use AIX APAR IV54937
APAR Information
APAR number
IV54907
Reported component name
AIX 610 STD EDI
Reported component ID
5765G6200
Reported release
610
Status
CLOSED PER
PE
YesPE
HIPER
YesHIPER
Submitted date
2014-02-03
Closed date
2014-02-04
Last modified date
2016-05-10
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
AIX 610 STD EDI
Fixed component ID
5765G6200
Applicable component levels
R610 PSY U861317
UP14/10/28 I 1000 «
PTF to Fileset Mapping
U861317 devices.common.IBM.mpio.rte 6.1.9.30
U857830 devices.common.IBM.mpio.rte 6.1.9.15
U862221 devices.common.IBM.mpio.rte 6.1.9.2
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Document Information
Modified date:
10 May 2016