Changes since the last edition of the manual

This manual contains the following major changes compared to the preceding manual.

MAREN V12.6B

• MARENEKM feature and tape encryption support was removed.
• Topic "Encryption tapes" in the chapter "Managing tapes" was removed.
• Chapter "MARENEKM administrator program" was removed.

MAREN V12.6C

• Support for WORM Volumes

  WORM (Write Once, Read Many) refers to a storage concept in which data on a WORM volume can be written only once and, after that, cannot be modified or deleted, but can be read any number of times. MAREN provides opportunity to store special WORM volumes attributes: protection period and protection expiration date. MAREN support special handling of WORM volumes like not allows to free them if they have been already written and not allows to delete them from MAREN catalog before the active protection period has expired.
  

  Restrictions:

  New media must be initialized before first use. During initialization, the protection period preconfigured for WORM volumes of a volume group in the ETERNUS CS is activated. Until the protection period has expired or the protection expiration date has been reached, it is not possible to delete the tape in the ETERNUS CS.

  In MAREN, the protection period or the protection expiration date is only calculated when the tape is opened for writing and data is written, for example as part of a save. It is therefore recommended to initialize volumes only shortly before their use, so that the protection expiration date displayed in MAREN matches the protection period in the ETERNUS CS.

  This restriction will be removed with the general customer release as part of SP 26.1. From then on, MAREN will be able to calculate the protection expiration date during tape initialization and thus determine it automatically and correctly.

  In general, it is recommended to write to the WORM volume promptly after initialization so that the protection period covers the user’s planned usage timeframe. As usual, the user controls data retention via the expiration date or the retention period. The user has no influence on the protection period in the ETERNUS CS.

  
  

• Modified MARENADM statements
  

  Statement	Changes of user interface	Changes in behavior
  ADD-FREE-VOLUMES	YES New operand PROTECTION-PERIOD	Check of validness of the PROTECTION-PERIOD for WORM volume and save it in MAREN catalog.
  ADD-RESERVED-VOLUME	YES New operand PROTECTION-PERIOD	Check of validness of the PROTECTION-PERIOD for WORM volume and save it in MAREN catalog.
  DELETE-VOLUME-ENTRY	NO	Prevents from deletion of  written WORM volumes when the active protection period is not expired yet.
  EDIT-VOLUME-ATTRIBUTES	NO Nothing has changed as processing is to be done by MODIFY-VOLUME-ATTRIBUTES statement	Same as for MODIFY-VOLUME-ATTRIBUTES
  EXPORT-VOLUME	NO	Rejection export of WORM volumes
  FREE-VOLUMES	NO	Rejection freeing of already written WORM volumes.
  IMPORT-FOREIGN-VOLUME	NO	Rejection attempts to import-foreign-volume as WORM volumes
  IMPORT-VOLUME	NO	Reject an attempt to import of WORM volumes
  INITIALIZE-VOLUMES	NO	Initialization of WORM volumes with NOHDR.
  MODIFY-TAPE-SET-ATTRIBUTES	YES New operand: PROTECTION-PERIOD	Updates PROTECTION-PERIOD, PROTECTION-EXPIRATION-DATE for the WORM volumes within the tape set in case the PROTECTION-PERIOD is changed. The update rejected if the PROTECTION-PERIOD is set lower than the current for written WORM volume
  MODIFY-VOLUME-ATTRIBUTES	YES New operand: PROTECTION-PERIOD	Updates PROTECTION-PERIOD, PROTECTION-EXPIRATION-DATE for the specified WORM volumes in case the PROTECTION-PERIOD is changed. The update rejected if the specified PROTECTION-PERIOD is lower than the current for written WORM volume
  RESERVE-FREE-VOLUME	NO	WORM volumes are processed the same way as other volumes. Internal only: code changes are done to handled new MARENCAT fields
  SHOW-FREE-VOLUMES	NO	New volume attributes PROTECTION-PERIOD and PROETECTION-EXPIRATION-DATE are issued in S-variables
  SHOW-VOLUME-ATTRIBUTES	NO	PROTECTION-PERIOD and PROTECTION-EXPIRATION-DATE are displayed for the WORM volumes.
  UPDATE-MAREN-CATALOG	YES New operand: PROTECTION-PERIOD	Sets/updates PROTECTION-PERIOD, PROTECTION-EXPIRATION-DATE for the WORM volumes in case the PROTECTION-PERIOD is specified in case of INPUT=*BY-HSMS(…) or *BY-ARCHIVE(…)
  VERIFY-MAREN-CATALOG	NO	The fields storing protection period and protection expiration date are handled.