Recycling (z/OS
Use the MODIFY OMVS command to recycle z/OS UNIX System Services. This is an alternative to re-IPLing the the system in order to reinitialize the z/OS UNIX System Services environment. This command should be used only on a limited basis when complete reinitialization and reconfiguration are required. Prior to issuing MODIFY OMVS to initiate a shutdown, you should review the information about shutdown in z/OS UNIX System Services Planning.
The MODIFY OMVS,SHUTDOWN command completely disables z/OS UNIX
services. IBM® strongly recommends that an installation perform
the following steps prior to issuing the command:
- Attempt to dry up batch and interactive workloads. Once a shutdown request is accepted, jobs that subsequently attempt to connect to z/OS UNIX services for the first time will be delayed until restart occurs; jobs that are already connected to z/OS UNIX services (dubbed) will be sent terminating signals and will end abruptly.
- Follow recommended procedures to quiesce applications and subsystem workloads using z/OS UNIX services. This will allow subsystems such as DB2®, CICS®, and IMS, and applications such as SAP, LOTUS DOMINO, NETVIEW, and WEBSPHERE to be quiesced in a more controlled manner than would occur if simply using this command. Use the D OMVS,A=ALL command to determine which applications, if any, require quiescing.
- Shut down TCP/IP and all TCP/IP applications in the manner that TCP/IP recommends.
- Shut down any colony PFS address spaces. This could potentially include NFS.
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The parameters are:
- OMVS
- The name of the job.
- SHUTDOWN
- Request that the system shut down the UNIX services environment, which includes quiescing all running UNIX services work on a given system.
- RESTART
- Request that the system restart the UNIX services environment which has shut down successfully.
- OMVS
- Specifies the parmlib member or members (BPXPRMxx) to use to
locate the parmlib statements to configure the z/OS UNIX kernel.
If the OMVS parameter is not specified, the BPXPRMxx member used on the previous start of OMVS is processed again, with any updated contents taking effect.
Example 1:
To shut down the UNIX services environment, enter:
F OMVS,SHUTDOWN
The following highlighted console message will be displayed when
the shutdown request is accepted:
BPXI055I OMVS SHUTDOWN REQUEST ACCEPTED
If a shutdown request cannot be accepted, the following console
message will be displayed:
BPXI057I OMVS SHUTDOWN REQUEST REJECTED
If a shutdown request is delayed because of blocking jobs or processes,
the following console message will be displayed when the delay exceeds
a finite time interval:
BPXI064E OMVS SHUTDOWN REQUEST DELAYED