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File Retention Policies in EMC Celerra

One of EMC’s NAS devices, Celerra, uses WORM (Write Once Read Many) mechanism to protect files and directories from deletion or alteration. You can specify the file retention period. For this period no user except the storage admin can edit or delete the files.
In this process of marking a file as WORM, the file goes through three stages – CLEAN, WORM, and EXPIRED. This WORM capability of Celerra is based on two NAS protocols – NFS and CIFS. You can mark a file as WORM using one of the following options:

  • The Data Access in Real Time (DART) operating system lets you configure the retention period.
  • Alternatively, you can also use Celerra’s file-level retention property to designate a file as WORM (known as CWORM). This is a part of Celerra File Server configuration.