IBM Z Hardware and Operating Systems Ideas Portal


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USS

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ZFS save cpu. Provide option to stop SMF file activity, and eliminate getmain/free main for every open/close SMF record

When I was looking into Java was so slow on z/OS compared to Ubuntu, I noticed there was an SMF call for every file open ( and close) , and a getmain/freemain as well. To start z/OSMF took over 600 seconds of CPU! This needs to come down to about ...
about 1 year ago in z/OS / USS 1 Not under consideration

CHECK(IBMUSS,USS_PARMLIB_MOUNTS) make MTAB updatable.

IBM Healthchecks are very good to follow, to avoid an outage. We use them a lot! But if a mount statement of a ZFS data set is wrongly defined in BPXPRMxx. The Healthcheck (IBMUSS,USS_PARMLIB_MOUNTS) complains with an exception. "ZFS NOT MOUNTED. ...
over 9 years ago in z/OS / USS 3 Future consideration

Customer needs to map up to one million shared mutex/shared condvar per shared memory segment under z/OS Unix.

Customer running an app that hit an internal limit (JRSMCMaxCntSeg 65535 decimal)) creating shared mutex and shared convars. Discussions with the customer indicate that there is a need to support one million of these type of structures. This will ...
about 1 year ago in z/OS / USS 0 Future consideration

MMAP function under z/OS USS should be able to use 64bit address space.

We have a proof of concept to run an off-the-shelf name indexer product under z/OS USS. This product is a native 64-bit Java 8 application that uses the Lucene indexer. The product functions under USS for small indexes. However, the call to mmap i...
over 7 years ago in z/OS / USS 1 Future consideration

Simplified MNTE_SYSLIST syntax as part of z/OS UNIX REXX mount command

Currently, if a user would like to include MNTE_SYSLIST as a parm in his USS REXX mount command implementation, the user must code the MNTE_SYSLIST as though they are writing assembler code using the mapping described in BPXYMNTE: MNTENTSYSLISTNUM...
over 1 year ago in z/OS / USS 0 Future consideration

Z/OS Unix OCOPY

Update OCOPY to correct abend S213-15 (IEC143I) if DSNTYPE=LARGE and SMS BLOCKTOKENSIZE is REQUIREd.
over 5 years ago in z/OS / USS 4 Future consideration

BPXN004I msg should be "E"

BPXN004I error condition is much more than an information msg and this condition can cause sysplex wide uss issues
over 8 years ago in z/OS / USS 2 Future consideration

Automount and RACF FSACCESS

When we use automount, where the policy creates a new zfs for a userid, in conjunction with RACF FSACCESS, "phantom" directories are created. It would seem more sensible that automount honours FSACCESS before the dataset is created.
over 5 years ago in z/OS / USS 1 Future consideration

ID Token support in pthread_security_np et al

Please add RACF/SAF ID token support to pthread_security_np and pthread_security_applid_np C library functions (and underlying BPXnTLS etc) so that an ID token can be passed as the "identity" parameter to these functions. Oh and please do Java too...
over 4 years ago in z/OS / USS 1 Future consideration

RACF Profile BPX.SAFFASTPATH

Make BPX.SAFFASTPATH more granular (e.g., add userids and access) or add another profile with a userid and access authority to USS resources. Access to UNIX services and resources (e.g. IPC queues) requires many, many SAF Router (IRRSXT00) calls f...
over 7 years ago in z/OS / USS 1 Future consideration

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