OMVS Settings for HostBridge for zIIP

Here are some recommendations for OMVS settings when using HostBridge for zIIP.

First, determine what your current settings for OMVS are. This can be done by issuing the following JES2 command:

/D OMVS,OPTIONS

You will see output in the z/OS log that looks like this:

RESPONSE=S0W1
BPXO043I 10.41.55 DISPLAY OMVS 461
OMVS 000F ACTIVE OMVS=(00,01,BP,IZ,CI,DB,W9,RZ,RT,BB,O
CURRENT UNIX CONFIGURATION SETTINGS:
MAXPROCSYS = 1200 MAXPROCUSER = 32767
MAXFILEPROC = 65535 MAXFILESIZE = NOLIMIT
MAXCPUTIME = 7200 MAXUIDS = 400
MAXPTYS = 800 MAXIOBUFUSER = 2048
MAXMMAPAREA = 40960 MAXASSIZE = 2147483647
MAXTHREADS = 20000 MAXTHREADTASKS = 32768
MAXCORESIZE = 4194304 MAXSHAREPAGES = 32768000
IPCMSGQBYTES = 20971520 IPCMSGQMNUM = 10000
IPCMSGNIDS = 1000 IPCSEMNIDS = 500
IPCSEMNOPS = 25 IPCSEMNSEMS = 1000
IPCSHMMPAGES = 25600 IPCSHMNIDS = 500
IPCSHMNSEGS = 500 IPCSHMSPAGES = 262144
SUPERUSER = OMVSKERN FORKCOPY = COPY
STEPLIBLIST =
USERIDALIASTABLE=
PRIORITYPG VALUES: NONE
PRIORITYGOAL VALUES: NONE
MAXQUEUEDSIGS = 1000 SHRLIBRGNSIZE = 67108864
SHRLIBMAXPAGES = 4096 VERSION = Z24A ,N
SYSCALL COUNTS = NO TTYGROUP = TTY
SYSPLEX = YES BRLM SERVER = N/A
LIMMSG = NONE AUTOCVT = OFF
RESOLVER PROC = RESOLVER LOSTMSG = ON
AUTHPGMLIST = NONE
SWA = BELOW NONEMPTYMOUNTPT = NOWARN
SERV_LINKLIB =
SERV_LPALIB =
ALTROOT =
MAXUSERMOUNTSYS = 0 MAXUSERMOUNTUSER= 0
MAXPIPEUSER = 8730 PWT = ENV
KERNELSTACKS = ABOVE UMASK = NONE
SC_EXITTABLE =

This will show you how the OMVS system is currently defined.

To change these values permanently, you will need to modify your z/OS system PARMLIB member(s) that start with BPXPRMxx, where xx is a suffix. Once changed, the new values will take effect when the next z/OS IPL occurs.

Some of the parameters can also be modified dynamically using the MVS operator command SETOMVS parameter1=xxxx,….,parmeterN=xxxx. These changes will be in effect until changed again via a SETOMVS command or until z/OS is terminated.

The following table shows the parameter values that we recommend and an indication as to whether or not the parameter can be modified dynamically. Only the parameters that affect the use of HostBridge for zIIP are listed below.

Command

Value

Dynamically changable?

Command

Value

Dynamically changable?

MAXPROCSYS

1200

Yes

MAXPROCUSER

32767

Yes

MAXTHREADS

20000

Yes

MAXTHREADTASKS

32768

Yes