Hi. I've been running a few tests with reiserfs and tails, and have been unable to create a setup where the use (or lack) of tails results in a significant difference in the amount of disk space used.
Here's what I've done:
1. Create a fresh 1GB filesystem (in a file on loopback), using reiserfs
with no options.
2. Mount the filesystem with either no options, "notail", "tails=off",
"tails=on", or "tails=small".
3. Unpack a sources tarball onto the filesystem, consisting of two fully
compiled versions of the linux kernel. The tarball contains 47996 files
and 3321 directories totalling about 660MB of space.
4. Measure the free disk space using df.
5. Use dd to fill up the free disk space and count how many 1kB blocks
it could write.
In all of the tests, the result was within 12kB of each other. In fact,
the tests with "notail" or "tails=off" options had more usable disk
space than when using tails.
Results:
Options 1K-blocks Used Available
default 1023964 645988 377976
notail 1023964 645988 377976
tails=off 1023964 645996 377968
tails=on 1023964 646000 377964
tails=small 1023964 645996 377968
default 377600+0 records out
notail 377600+0 records out
tails=off 377592+0 records out
tails=on 377588+0 records out
tails=small 377592+0 records out
I've put the log files and scripts up for review at
http://untroubled.org/reiserfsdf/
I'm using Gentoo Linux, kernel 2.6.14-gentoo-r5
Am I missing something, is this an expected result, or is something
broken?
Thanks.
--
Bruce Guenter <[EMAIL PROTECTED]> http://untroubled.org/
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