3.3.1, qic 24, 600 ft. tapes, and distcp

[James Helman]

    It seems that 3.3.1 is slightly less than 70MB which is somewhat
    greater than the 60MB I can write on a 600 ft. tape in qic 24
    format.  Am I missing something or is 3.3.1 on a 700 foot tape.

When I needed to make a copy of the 3.3.1 tape, I used dd (on a Sun
but that shouldn't make any difference) rather than distcp.  The files
totaled 62227456 bytes, which fit on a DC600A tape.  Apparently the MB
in the 60MB is 1024**2 bytes, because that brings it in just under
60MB at 59.34MB.  Anyone know if 60*1024*1024 is really the max raw
capacity of a 600ft QIC-24?.

Since you indicate closer to 70MB, perhaps distcp is trying to put
other stuff (boot files?) on the tape as well.  Following are the
files sizes I found:

		File      Size
		1          512
		2          512
		3         8192
		4        53760
		5     19300864
		6        82432
		7     19431936
		8     19370496
		9        25088
		10      770560
		11       16896
		12       74240
		13        4608
		14     1294848
		15       25088
		16     1561088
		17       20992
		18       49664
		19      135680
		Total 62227456

Jim Helman
Department of Applied Physics			Durand 012
Stanford University				FAX: (415) 725-3377
(jim at KAOS.stanford.edu) 			Work: (415) 723-9127