DUMP parameters

DUMP parameters

Post by Marc van Ende » Wed, 23 Sep 1992 17:53:56

I'm determening the parameters to use for the dump command. We use a new
HP 2000DC dat unit in our network.

I've never had any problems determining the parameters before because they
were stated in the manuals. But this time, they're not.

When I calculate the density to use for the HP 2000DC drive ( average +/- 8Mb
stated in the manual for  a 90 meter tape), I do something like:
 90m = 3542 inch
 8 Gb = 8 * 1024 * 1024 * 1024 * 8 bits
 bits / inch available = BPI

But, when I look to the parameters sun proposes for it's 2.3 Gb exabyte tape
unit ( 6000 feet -- 54000 BPI) it seems this method does not work.

So, how can i calculate the right numbers to use for the DUMP command to use??? Or do
i use trail and error?


(040-7)35983                  |   nlevdpsb.c849095i            


1. dump parameters for Suns with EXB 8500

Anybody know the CORRECT density, tape size, and blocking factor
parameters for an Exabyte 8500 using Sun's dump command? (I'm using
the "standard" 112m data grade tapes, and SunOS 4.1.3.)

Care to share how you came up with those numbers?

Correct me if I'm wrong, but something seems fishy about the parameters
listed in the man pages. (Also, an Admin I know at Sun says the man pages
are wrong.) I've read the dump FAQ, and came away more confused than
before. :-\  I've asked five other Sys Admins for their input, and each
has given me a completely different set of parameters for the same
environment. <aargh!> Somebody out there must know...

Bonus question: how about the parameters for a high-density DAT drive?

| Gary Merrick                System/Network Admin from Hell  |

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