Spectra Logic Spectra nTier File Migrator, Руководство пользователя

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Chapter 6 – System Recovery
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Options In Case of Tape Library or Stand-Alone Drive Failure
In normal operation, the nTier File Migrator software writes files to tape as soon as
they have been written to magnetic disk. By doing this, the system provides the
improved data integrity and security necessary for an archival storage system by
ensuring that a second instance of all data written to disk is generated almost instantly.
This provides continuous data protection. In the case of WORM media, it further
ensures that an unalterable and non-erasable version of the data is made in a timely
fashion, as required by many regulatory authorities.
However, in the event of a shortage of blank tapes or a failure of the tape library
hardware, no data can be written to the system. For some applications that require data
to be written immediately to WORM media, the system stops writing data until the
error condition has been resolved.
In some less critical applications it may be acceptable to write data only to disk for a
short time, waiting until the problem has been resolved before writing the data to tape.
To do this, turn off the Save files to tape option for each File Group.
When the problem has been resolved, re-enable the Save files to tape option and
enable the Use a background process... advanced option as well. The system
immediately starts archiving new data to tape while at the same time performing a
background scan, writing old files to tape that should now be archived.