Missing gigabytes with UFS

From: Patrick McCormick <pmccormi_at_MIT.EDU>
Date: Mon, 15 Jun 1998 18:30:03 -0400

I just added a Seagate ST118273LW (Barracuda 18G) drive to an AlphaStation
500. The installation went fine, and the drive was detected and labeled
with no problem. We want to use the whole drive for data, so we newfs'd
partition c. Disklabel says this about partition c:

  c: 35566480 0 4.2BSD 1024 8192 16 # (Cyl. 0 -
7503*)

df -k says this about the mountpoint:

Filesystem 1024-blocks Used Available Capacity Mounted on
/dev/rz1c 17254184 1 15528764 1% /ext

Now, the 17G number is what I expected, but the 15.5G number is far lower
than I had hoped. Where did the 1.7 GB's go? I suspect that maybe UFS
can't handle such a large partition or needs a lot of accounting space.
Please let me know if you have a good answer to this.

Also, if anyone has advice on better ways of partitioning such a data drive,
I'll be happy to hear it.

I'll send a summary of responses to the list.

--Pat McCormick
pmccormi_at_mit.edu
Received on Tue Jun 16 1998 - 00:30:50 NZST

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