[comp.sys.sgi] 3.3.1, qic 24, 600 ft. tapes, and distcp

root@sgzh.uucp (Bruno Pape) (09/23/90)

Hello Magnetic Media types,

I was planning on making some copies of my 3.3.1 tape to ship out
to some people who need it.  But I seem to have run into a small
problem.  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.

Thanks for any insight,

Bruno

jim@baroque.Stanford.EDU (James Helman) (09/24/90)

    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@KAOS.stanford.edu) 			Work: (415) 723-9127

root@sgzh.uucp (Bruno Pape) (09/24/90)

In article <1990Sep23.115728.3955@sgzh.uucp> I wrote:
>
>Hello Magnetic Media types,
>
>I was planning on making some copies of my 3.3.1 tape to ship out
>to some people who need it.  But I seem to have run into a small
>problem.  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.
>
>Thanks for any insight,
>
>Bruno
>

Thanks to all who answered my plea.  As they said using dd it comes
to only 60.77MB so it looks like everything will be fine.

Thanks again,

Bruno