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 and DFS.
F OMVS{,SHUTDOWN}
{,RESTART[,OMVS=(xx,yy)]}
|
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