These results shows that you can share now zFS file systems mounted in read-write mode in a UNIX System Services sysplex file system sharing environment with no performance disadvantage for a client system on data access. Therefore, the old requirement MR1211023911 addressed to zFS is solved. zFS metadata considerations Although data access from a client system is no longer a problem, restrictions still apply to complex access operations to metadata. Note: It is important to run commands resulting in complex access to metadata (for example, find $MPDIR -xdev -exec ls -Ed {} ";") on the zFS owning system. If the UNIX file structure is large, you might see the zFS ownership moving if you start the command on a client system in such a situation. 15.9 Add symbolic links to shared root filesystem z/OS V1R13 offers a new feature that provides benefits for symbolic links in the version root file system. In previous releases it was not possible to mount a version-root file system read-only without having to take post-installation actions for several utilities such as cron, mail and uucp after each new release. New support in z/OS V1R13 eliminates the post-installation actions by defining symbolic links for these utilities to allow using them in a read-only version root file system at installation time.