This manual contains the following major changes compared to the preceding manual.
MAREN V12.6A
Adaptation to BS2000 OS DX V1.0
- In the MAREN statement SHOW-VOLUME-ATTRIBUTES the new operand VOLUME-STATUS was added. It selects tapes in the specified directory on the basis of their status.
- New MAREN statement SHOW-VOLUME-GROUP.
For the privileged user
The changes are described in the “MAREN System Administrator Guide”.
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 MAREN statements
Statement
Changes of user interface
Changes in behavior
EXPORT-VOLUME
NO
Rejection export of WORM tapes.
SHOW-VOLUME-ATTRIBUTES
NO
PROTECTION-PERIOD and PROTECTION-EXPIRATION-DATE are displayed for the WORM tapes.