Viewing SVC dumps
A SVC dump is a core dump initiated by the operating system generally
when a programming exception occurs. SVC dump processing stores data in dump
data sets that you pre-allocate, or that the system allocates automatically
as needed.
Alternatively, you can initiate an SVC dump through the MVS console, to
gather diagnostic data for a 'hang' condition, for example. SVC dumps that
you initiate this way are called console dumps.
One example of an abend that could occur is the EC3 abend. WebSphere Application
Server for z/OS requests an SVC dump when a controller terminates a servant
(region) with an EC3 abend when timeout conditions occur.
- Your installation can set parmlib options that determine what to dump,
eliminate duplicate dumps, and so on. WebSphere Application Server for z/OS
provides a dump parmlib sample in
SBBOJCL(BBODMCCB)
.
- The standard SDATA expected in a SVC dump:
SDATA=(ALLNUC,CSA,GRSQ,LPA,LSQA,PSA,RGN,SQA,SUM,SWA,TRT),end
- If you cannot find an SVC dump for a specific abend, your installation
might be using Dump analysis and elimination (DAE) to suppress the dump. If
this is the case, you can change DAE to let the dump be taken or set a SLIP
on the specific abend for a particular job name if the timeout is consistently
happening. For further information, see:
- When you initiate a console dump:
- When you want an SVC dump of a servant region, also request a dump of
the servant's controller region.
- Unless you suspect a particular servant region as the source of a problem,
dump the controller region and all of its servant regions.
- If syslog contains a message indicating that the maxspace limit was reached
for this dump, the SVC dump might be a partial one that might not contain
the data you need to diagnose the timeout. This limit means that the data
set used for SVC dump is not large enough, and you have to change the size
to capture a complete dump.
- To view CEEDUMP contents within the SVC dump, use the IPCS verbexit LEDATA,
with the CEEDUMP or NTHREADS options, to format and analyze Language Environment
control blocks. For additional information, see z/OS Language Environment Debugging Guide,
GA22-756
for instructions for using IPCS to format and analyze CEEDUMP
contents.
See z/OS MVS Diagnosis: Tools and Service
Aids, GA22-7589
for additional information about SVC dumps.
Searchable topic ID:
rtrbviewsvcdump
Last updated: Jun 21, 2007 9:56:50 PM CDT
WebSphere Application Server for z/OS, Version 5.0.2
http://publib.boulder.ibm.com/infocenter/wasinfo/index.jsp?topic=/com.ibm.websphere.zseries.doc/info/zseries/ae/rtrb_viewsvcdump.html