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Re: [fam] Some Questions

To: Florian Bachmann <f_bachmann@xxxxxxxxxxx>
Subject: Re: [fam] Some Questions
From: Michael Wardle <michael.wardle@xxxxxxxxxx>
Date: Mon, 27 May 2002 09:39:36 +1000
Cc: fam@xxxxxxxxxxx
Organization: Adacel Technologies
References: <200205242345.19143.f_bachmann@xxxxxxxxxxx>
Sender: owner-fam@xxxxxxxxxxx
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0rc2) Gecko/20020512 Netscape/7.0b1
Florian Bachmann wrote:
1)
What is the current status of imon? Will it be maintained for upcoming kernel releases, are there alternatives, etc.

I believe I have answered this question a few times here, and it's also partially mentioned in the FAQ. You may want to read back thru the mailing list
http://oss.sgi.com/projects/fam/mail.html
and the FAQ
http://oss.sgi.com/projects/fam/faq.html
to see full answers to these questions.

Here's a few URLs that might help you:
http://oss.sgi.com/projects/fam/faq.html#what_os_imon
http://oss.sgi.com/projects/fam/archive/msg00394.html
http://oss.sgi.com/projects/fam/archive/msg00424.html

To answer your question briefly:
IMon is still alive, but I'm not maintaining it. DNotify is an alternative that's now available in official Linux kernels, so that is what I'd recommend using.

I'll soon merge Alex Larsson's DNotify patch into our tree, but until then, you can get the DNotify patch from:
ftp://oss.sgi.com/projects/fam/download/contrib/dnotify.patch

As usual, get a copy of the FAM distribution (sources), extract the files, and run "patch -p1 < /path/to/dnotify.patch" to apply the patch.

2)
Are there any reliable statistics on how many monitored files/directories FAM can handle at a time (both local and networked filesystems)? Is it really feasible to use FAM on some hundreds of files at a time, or should I just forget about that?

I think there is a limitation meaning that no more than 1024 files can be monitored simultaneously, but this may be a limitation of the kernel monitor (such as IMon) rather than a limitation of FAM. I would appreciate if somebody could provide a more definitive answer.

3)
From the INSTALL file in the distribution archive: "The install target doesn't
modify your configuration files; you'll have to do this yourself". Yet, after running make install I found that /etc/rpc and /etc/inetd.conf had been modified. Hmmm.... I may be paranoid but this gives me a bad feeling.

The statement in INSTALL is incorrect. The former maintainer (Rusty) did some work with something called "editconf" that manipulated the necessary files to make FAM work thru inetd. Provided that your configuration files were modified in accordance with the instructions in INSTALL, then there's little need to worry that your version was modified.

I'm planning on removing the existing "make install" target and replacing it with something simpler, but there's a few people at SGI that still need the target as it is.

This topic is also mentioned in the FAM FAQ, but I apologize for the inconsistency.


--
MICHAEL WARDLE
SGI Desktop & Admin Software
Adacel Technologies Limited


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