[239] in The Cryptographic File System users list
Backups & cfs . . . archives of this list available?
daemon@ATHENA.MIT.EDU (Brian T.Schellenberger)
Wed Sep 19 11:32:56 2001
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From: "Brian T.Schellenberger" <bts@babbleon.org>
To: cfs-users@research.att.com
Subject: Backups & cfs . . . archives of this list available?
Date: Tue, 18 Sep 2001 21:10:01 -0400
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First, if archives of this list are available, please let me know. I very
much doubt that I'm the first person to ask the questions I'l liable to ask,
and if I don't have to bother y'all, that's better.
But I'll go ahead and ask my first questions anyway . . .
RESTORING FROM BACKUP:
What do I need to do in order to properly backup & restore from a cfs file
system. The man pages says that "-l" on cattach makes it "easier" to backup
& restore individual files, but is it in fact, not easier, but strictly
necessary in order to do partial restores?
I'm not have good results when I try to restore, although mY 'toy' tests
seemed to be ok.
DEFAULT ALGORITHM:
Also, I noticed that the source code I have seems to default to the blowfish
algorithm even though it complains that it's new if I select it myself.
(Actually I am selecting it myself anyway; after doing a bit of research &
experimentation, it seemed to offer the nicest tradeoff between security and
performance for my purposes, though general opinions are not unwelcome.)
This is on line 46 of cmkdir.c, which makes me thing it's setting the default:
/*
* client cfs mkdir - 1.4.0
*/
:
int ciph=CFS_BLOWFISH;
MEMORY USAGE:
I have 512M of RAM; nonetheless, if I am doing intense CFS work (as in
checking out an enormous CVS tree into the CFS space), memory usage grows
very large. It appears, in fact, that CFS winds up using up about half of my
memory . . . when I had 256M, it used about half of that, but when I upgraded
to 512M, it used about half of that, too. This is perhaps a quirk of FreeBSD
and/or xosview and the way it "sees" memory, but I wondered if anybody else
had seen this sort of thing.
THE SECOND-FILE PROBLEM:
I'd noticed this odd phenomeon a number of times. If I freshly attach to my
CFS and read a large file, it is quite speedy. But if I almost immediately
read a *second* large file from the same CFS directory, there is a l-o-n-g
(I'm talking 30+ seconds here) pause before the file read begins to return
bytes.
Again, I haven't quantified this, but before I spent too much time on it, I
was wondering if anybody else had seen this sort of effect.
Running: cfs 1.4.0 FreeBSD 4.3-STABLE
Thanks!
--
Brian T. Schellenberger . . . . . . . bts@wnt.sas.com (work)
Brian, the man from Babble-On . . . . bts@babbleon.org (personal)
http://www.babbleon.org
--------------------> Free Dmitry Sklyarov! <-------------------------
http://www.eff.org http://www.programming-freedom.org
