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Subject: comment on Jul/Aug issue
Date: Fri Jul 15 20:56:51 1994
Emmett Dulaney's "When Inodes Go Bad" did
a good job of covering typical
filesystem problems, but I fear it may cause needless
worry by not
qualifying the very first fsck message: "POSSIBLE
FILE SIZE ERROR." I
get one of these every time I boot my machine, but have
ignore it. Sometimes this message can safely be ignored,
"POSSIBLE" is there for a reason.
Some databases -- including some created by UNIX system
utilities -- create big files with "holes"
in them. If more than 1 block
of a file is never initialized, it need not have a disk
to it. Then the number of blocks assigned to the file
can be less --
often much less! -- than the length of the file that's
declared in its
inode. This is perhaps the commonest cause of this apparently
The proper course of action is to use ncheck -i to identify
the file. If
it's one of those likely to contain holes, don't worry;
is really OK. For further details, see the discussion
on pp.187-188 of
Thomas & Farrow's UNIX Administration Guide for
Thanks for the reference. I'm not certain this should
put anyone at
ease, but I don't think I've ever identified a "real"
problem related to
"POSSIBLE FILE SIZE ERROR." I do, however,
remember being very concerned
about these messages when we first started using UNIX.
Maybe your letter can bring a little peace of mind to
admins who are encountering this message
Subject: Article in Sys Admin
Just read your article in SysAdmin (Using Linux as a
1996), and I was wondering which ISDN TA you were using,
as it wasn't
mentioned in the article.
BTW, thanks for writing the article, as that and the
other one on Linux
were what convinced me to buy this issue.
Looking forward to hearing from you,
We used an ADTRAN ISU 2x64 terminal adaptor. I have
also used a
Motorola BitSurfr in a PPP application, which has also
worked out well.
Jonathan Feldman <firstname.lastname@example.org>
Subject: Article in January Sys Admin
Thanks for the timely article on using Linux as a router!
I was just
wondering if you could take the time to answer a couple
about the software you used.
1) What version of the Linux kernel are you using? 2)
Where did you get
gated? As far as I can tell it is not included with
Slackware 2.3. I
have found the source at Merit but was wondering if
you had located a
precompiled version for Linux. TIA!
Andrew C. Moody
Unix System Analyst
University of Maine
We're using Linux 1.2.0. The "latest and greatest"
version at this
writing is 1.2.8, and is achievable by patching your
source code. I
haven't done this to our kernel, because I don't know
of a reason to do
An "as-is" version of the gated executable
& config files is available
If you want source obtained from Cornell, get it from
Be warned that the most recent versions of gated (which
the above is
not) will require IP Multicasting to be enabled in