ExaByte Dump commands

[Rick Meneely]

Roger Jagoda:
> I have inherited a UNIX system (VAX/ULTRIX) with a SCSI Exabyte (OEM'd 3rd Party as usual) Tape unit. My question regards the parameters for the best "dump"
> command use. For example, we're using now:
>  
> dump <level>usdf 4800 6666 /dev/nrmt1h <f. system>

My Exebyte manual for an EXB-8200 from Perfect Byte, Inc.
suggests using 54000 bpi and 6000 ft for a 120 minute cartridge tape -
for 'dump'.  It notes that these are not "real" values but are "faked"
in order to get 'dump' to work properly.  In essence 'dump' outsmarts
itself.

It also notes that if you are writing multiple dumps to a single tape
you should decrease the size (length) parameter proportionally for
sucessive dumps.

> As for feet of tape length, we have asked everyone including the mail
> order house where the tapes were bought, NO ONE seesm to know how many
> feet of tape come on a 120 tape! The actual model number of the tape is
> "P6-120MP" for "Metal Particle". If anyone knows how long these tapes
> are can they post an answer? 

	106 Meters =~ 344 ft.  (seems small doesn't it!)

					- Rick Meneely

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