z/OS MVS System Messages, Vol 3 (ASB-BPX)
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BPXH071E

z/OS MVS System Messages, Vol 3 (ASB-BPX)
SA38-0670-00

Start of change
BPXH071E
The z/OS UNIX System Services kernel usage of autodata cellpool cells has exceeded the check threshold of stacksthresholdpct%. Currently stacksused of the maximum stacksmax (stacksusedpct%) cells are in use.

Explanation

CHECK(IBMUSS,USS_KERNEL_STACKS_THRESHOLD) detected that the percent of kernel autodata stack cell pool cells in use has exceeded the current check threshold.

In the message text:
stacksthresholdpct
The check reporting threshold value specified in percent. The USS_KERNEL_STACK_THRESHOLD check will only issue messages when the percentage of stacks in use exceeds this threshold. The IBM® default value is 85%.

The IBM default threshold percentage value can be overridden. For more information, see the USS_KERNEL_STACKS_THRESHOLD check in IBM Health Checker for z/OS User's Guide

stacksused
The number of kernel autodata stack cell pool cells that are currently in use by the system.
mountpoint
The name of the mount point where the file system is mounted.
stacksmax
The maximum number of kernel autodata stack cellpool cells that can be allocated on the system. The value is determined at IPL time and is based on the amount of kernel private storage available. Once the value is determined it is fixed for the duration of the IPL.
stacksusedpct
The percentage of kernel autodata stack cellpool cells currently in use by the system.

System action

The system continues processing.

Operator response

Report the stack cell usage to the system programmer.

System programmer response

Consider quiescing noncritical UNIX workloads to make more kernel stack cells available to prevent a shortage that could impact critical workloads. If the system runs out of stack cells some z/OS® UNIX system calls will not be available until cells are available.

Use the DISPLAY OMVS, STORAGE command to determine which processes are using the largest number of stack cells and are the best candidates to be quiesced.

Problem determination

N/A

Module

BPXHCFL4

Source

z/OS UNIX System Services

Reference Documentation

Automation

N/A

Routing Code

N/A

Descriptor Code

N/A

End of change

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