zFS data sets

Table 1 lists new and changed zFS data sets.

Table 1. Summary of new and changed zFS data sets
zFS data sets Release Description Reason for change
IOESFSPRM z/OS V2R1 New option: The quiesce_message_delay option controls how long it takes in seconds for message IOEZ00581E to be displayed when an RWSHARE aggregate is quiesced. Enhanced zFS quiescing
z/OS V2R1 New options:
  • format_aggreversion specifies the default version of the aggregate when formatting it. The default version is 4. This option is also honored in ISHELL and AUTOMOUNT.
  • change_aggrversion_on_mount changes the aggregate version to 1.5 on read/write mount.
  • converttov5 changes the aggregate version to 1.5 and converts the root directory at mount time. Each v4 directory is converted to v5 when first accessed.
Changed options:
  • The default for convert_auditfid was changed to ON.
  • The default for meta_cache_size was changed, depending on whether metaback_cache_size and meta_cache_size is specified.
  • The default value for user_cache_size is calculated according to the real storage available during zFS initialization.
 Improved large directory performance
z/OS V2R1 New option: The max_errors option specifies the maximum number of errors that the salvager program allows before it stops. Improved salvager performance
z/OS V2R1 Changed: These options are ignored:
  • auto_attach
  • fsgrow
  • define_aggr
  • nbs
  • user_cache_readahead
 Removal of multi-file system aggregates and the zFS clone function.
z/OS® V1R13 Deleted: The following options were removed:
  • dir_cache_size
  • nbs
  • sysplex_admin_level
 Release update
Changed: The default values for the following options have changed:
  • aggrgrow
  • client_cache_size
  • client_reply_storage
  • file_threads
  • meta_cache_size
  • sysplex
  • sysplex_filesys_sharemode
Parent topic: zFS