Understanding abend U0001

Limitation:

The U0001 abend itself generates an unnecessary memory dump. If the memory dumps occur frequently, system performance might be affected.

The U0001 abend (abnormal end of task) is forced any time that OMEGAMON® for Storage on z/OS® detects that an attempt to collect space information for a volume has taken more that 15 seconds to complete. Typically, this operation completes in less that a second. The abend exists so that LSPACE tasks that run too long are terminated before they affect system performance. Otherwise, the task can affect system performance because it holds an exclusive enqueue on the volume while collecting space and fragmentation data.

Workaround:

Avoid this problem by adding a SLIP command to the SYS1.PARMLIB to bypass memory dumps for U0001 abends in the address space of the Tivoli® Enterprise Monitoring Server. An example of the SLIP command to add to the IEASLPxx member in your parmlib is as follows:

SLIP SET, C=U0001,JOBNAME=tems_taskname,A=NOSVCD,ID=xxxx,END

OMEGAMON for Storage on z/OS is the only OMEGAMON product that uses the U0001 abend.