thanks to all who responded...
(my original question is at the end...)
the consensus seems to be that the density and length are pretty much
irrelevent (execpt to determine estimates with the -E switch). the drive
itself will/may determine the appropriate information.
one cannot determine how much a given amount of disk space will take up on
the tape, since the amount of compression differs by file type, along with
the overhead of lots of little files.
for myself, i am going to append as many daily dumps onto a single tape,
all the while summing up the number of tape and disk blocks that get used.
the average after the tape is full should give me a good feel for what is
going on (and how many tape blocks there are on the tape.)
once again thanks to all for the info
dhb
------- original question -------
Hi there -
I am running Tur64 Unix V4.0F on an Alpha DS10 with a DAT TLZ10 tape
drive on it.
I have been appending my daily dumps onto a single tape, but reached
the end of tape much sooner than expected. I believe that I must
have the tape size or density computed wrong. (the description for
the dump command is pretty cryptic in the DLZ10 manual.)
Anyway I am using a 24GB DDS-3 tape. For the density, I am using 61000.
i calculated the tape size to be 229758 (or 3 * 153172 - as described
in the manual).
so my dump commands look something like
dump 1udsf 61000 229758 /dev/nrmt0h /dev/$fsys
and for some other calculations (determining the % of tape used up) i
figured the tape size to be (24G) = 25200000000
are my numbers all wrong?
Received on Fri Mar 24 2000 - 00:03:13 NZST