A fix is available
APAR status
Closed as program error.
Error description
For active/passive storage device, such as DS3K, DS4K, or DS5K if complete access is lost to the storage device, then it may take greater than 5 minutes to fail I/O.
Local fix
Problem summary
For active/passive storage device, such as DS3K, DS4K, or DS5K if complete access is lost to the storage device, then it may take greater than 5 minutes to fail I/O.
Problem conclusion
This feature is for Active/Passive storage devices, which are running with the AIX Default A/P PCM. This includes DS3K, DS4K, and DS5K family of devices. Added feature which health checks controllers when an enabled path becomes unavailable due to transport problems. By default this feature is DISABLED. To enabled this feature set the following ODM attributes for the active/passive storage device. Enabling this feature, results in faster I/O failure times. "cntl_hcheck_int" and "cntl_delay_time" NOTE: Setting either value to "0" disables this feature. cntl_delay_time: is the amount of time in seconds the storage device's controller(s) will be health checked after a transport failure. At the end of this period, if no paths are detected as good, then all pending and sebsequent I/O to the device will be failed, until the device health checker detects a failed path has returned. cntl_hcheck_int: The first controller health check will only be issued after a storage fabric transport failure had been detected. cntl_hcheck_int is the amount of time in seconds, which the next controller health check command will be issued. This value must be less than the cntl_delay_time (unless set to "0", disabled). If you wish to allow the storage device 30 seconds to come back on the fabric (after leaving the fabric), then you can set cntl_delay_time=30 and cntl_hcheck_int=2. The device, /dev/hdisk#, must not be in use, when setting the ODM values (or the chdev "-P" option must be used, which requires a reboot). CAUTION: There are cases where the storage device may reboot both of the controllers and become inaccessible for a period of time. If the controller health check sequence is enabled, then this may result in an I/O failure. It is recommended to to make sure you have an mirrored volume to failover to, if you are running with controller health check enabled (especially with under 60 second cntl_delay_time).
Temporary fix
Comments
APAR Information
APAR number
IZ66020
Reported component name
AIX 610
Reported component ID
5765G6200
Reported release
610
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2009-11-30
Closed date
2009-11-30
Last modified date
2013-03-28
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
U838791
Fix information
Fixed component name
AIX 610
Fixed component ID
5765G6200
Applicable component levels
R610 PSY U838791
UP10/09/03 I 1000
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Document Information
Modified date:
17 December 2021