eap@bu-pub.bu.edu (Eric A Pearce) (01/31/91)
I'm trying to set up a few Decstation 3100's with Ultrix 4.0.
They have rz24 (~200meg) internal drives. I want to change
the default partitioning to make /var and /tmp into separate partitions
and decrease the size of the swap area.
How come the default disktab entry doesn't have partition sizes that are
on cylinder boundaries?
rz24|RZ24|DEC RZ24 Winchester:\
:ty=winchester:ns#38:nt#8:nc#1348:\
:pa#32768:ba#8192:fa#1024:\
:pb#131072:bb#4096:fb#1024:\
:pc#409792:bc#8192:fc#1024:\
:pd#81984:bd#8192:fd#1024:\
:pe#81984:be#8192:fe#1024:\
:pf#81984:bf#8192:ff#1024:\
:pg#245952:bg#8192:fg#1024:
If there are 409792 sectors and 1348 cylinders, that means 304 sectors
per cylinder, right?
So the "a" partition wastes 64 sectors and the "g" wastes 288 sectors
if I use this entry. Playing with "newfs -N" backs up theses
numbers, and when I use multiples of 304, I don't get any messages about
unallocated blocks.
Is this due to Zone Bit Recording?
If so, do the Dec-supplied numbers give the most space?
-e
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Eric Pearce eap@bu-pub.bu.edu
Boston University Information Technology
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