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6.3.6: All FDC driver modules

The following options are understood by all FDC driver modules i.e. by ftape-internal.o, trakker.o and bpck-fdc.o.

ft_fdc_threshold=DEC0,DEC1,DEC2,DEC3

Set the FIFO threshold of your FDC DEC#X takes values between `1' and `16'. Setting DEC#X sets the threshold for `/dev/qft#X'.


ft_fdc_rate_limit=DEC0,DEC1,DEC2,DEC3

Set the maximum allowable data rate for the FDC. DEC#X has to be one of 250, 500, 1000, 2000, 3000 or 4000. Note that QIC-40 tape drives always operate at 250 kilobits/second, QIC-80 tape drives at either 500 or 1000, as well as QIC-3010 tape drives. QIC-3020 (i.e. TR-3) need at least 1000 and the Ditto Max may need at least 2000 (the docs say 1000, but I'm not sure). Setting DEC#X sets the rate limit for `/dev/qft#X'.

ft_fdc_rate_limit and ft_fdc_threshold are useful in case you find `reduced data rate because of excessive overrun errors' messages in your kernel log files. In this case, try first to increase the FIFO threshold, and if this doesn't help try to set the ft_fdc_rate_limit to a lower value. Try 1000 for QIC-3020 tape drives (i.e. TR-3) and 3000 for the Ditto Max.


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