A fix is available
APAR status
Closed as program error.
Error description
************************************************************** * USERS AFFECTED: * Systems running the AIX 7200-04-01 Technology Level * or VIOS 3.1.1.x * with devices.fcp.disk.rte at 7.2.4.0. ************************************************************** * ERROR DESCRIPTION: * Possible undetected data corruption can occur on AIX 7.2TL4 * or VIOS 3.1.1.x only, with disks who have the new * rw_max_time attribute set to a non-default value (any value * other than 0). * The problem can occur because I/Os may return as successful * even though the I/Os did not complete successfully. * The problem can be avoided by setting rw_max_time to 0, or * by applying the fix. * The command below to set the rw_max_time to 0 can be done * while the disks are in use and does not require reboot. * * To check if a disk has the rw_max_time attribute and to * verify the attribute's value, issue the following command: * * lsattr -El <hdiskX> -a rw_max_time * * To set the attribute's value to 0, issue the following * command: * * chdev -l <hdiskX> -a rw_max_time=0 -U * * Note: On VIOS, both these commands must be run as root * using 'oem_setup_env'. ************************************************************** * RECOMMENDATION: * Install APAR IJ22714. * Prior to fix availability, an interim fix is available from * either * ftp://aix.software.ibm.com/aix/ifixes/ij22714/ * https://aix.software.ibm.com/aix/ifixes/ij22714/ * The ifix can be installed using Live Update (LU). * If LU is not used, installation of the ifix requires a * reboot. **************************************************************
Local fix
Problem summary
If the new rw_max_time attribute is set to something other than the default value of 0, there is a chance that some disk I/O may be returned to the caller with good status even though the I/O did not actually complete successfully.
Problem conclusion
Modify disk driver to ensure that all I/O that is returned to the caller due to the expiration of rw_max_time is properly marked with a clear failure indication.
Temporary fix
********* * HIPER * *********
Comments
7200-04 - use AIX APAR IJ22714
APAR Information
APAR number
IJ22714
Reported component name
AIX V7.2
Reported component ID
5765CD200
Reported release
720
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Submitted date
2020-02-12
Closed date
2020-02-12
Last modified date
2020-11-16
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 V7.2
Fixed component ID
5765CD200
Applicable component levels
R720 PSY U884021
UP20/05/04 I 1000
PTF to Fileset Mapping
U884021 devices.fcp.disk.rte 7.2.4.1
[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSVEF8","label":"AIX 7.2 Enterprise Edition"},"Platform":[{"code":"PF053","label":"Power Systems"}],"Version":"720","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]
Document Information
Modified date:
18 November 2020