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The Tandberg DLT8000 system tape drive contains a data cache that buffers
blocks (records) until they are written to tape. This section describes when those
blocks are written, or “flushed” to tape. A Mode Select parameter allows the data
cache to be disabled (unbuffered mode). In this mode, every WRITE command
causes data to be written to the tape medium before the STATUS byte and the
COMMAND COMPLETE message are returned to the host.
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Unbuffered mode is NOT recommended due to the poor performance that
may result.
The contents of the write data cache are written to the tape medium under the
following circumstances:
• When two or more WRITE FILEMARKS commands are issued without
intervening tape motion commands.
• When a WRITE 0 FILEMARKS command is issued.
• When data has been in the cache longer than the maximum time specified by
the value of the Mode Parameter “Write Delay Time” (the default is 20
seconds).
• When a non-write type media access command is received (for example,
SPACE, READ, UNLOAD, LOCATE, ERASE).