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Or how we got
distracted while installing the new mail server...
July, 11 2002
Our existing mail
server, a Cobalt Raq3 running Red Hat Linux 7.1 started having
hardware problems and needed to be replaced.
This prompted discussion on if we should continue to use qmail, or migrate to Postfix (now included with Red Hat
Linux 7.3, our Linux distro of choice (and yes, we've used them
all, including Gentoo). Another decision to make was what
filesystem to use. We decided to stick with filesystems included
with the stable kernel, so that meant either ext3 or reiserfs. This
required some benchmarking to settle the question.
It is a little know fact that Red Hat Linux 7.2 and above can be
installed using reiserfs by passing the reiserfs option at the initial installation
prompt. In Disk Druid, reiserfs becomes a selectable filesystem
type. This makes installing with reiserfs an easy task.
- Intel Pentium
III 1133MHz 512 KB L2 cache
- 768MB 133MHz
- 3 x 18GB 15K
RPM Ultra160 SCSI in HW RAID5
- PERC 3/Di RAID
Controller with 128MB battery backed cache
In each case the
filesystems were laid out in the same fashion.
Filesystem Size Used Avail Use% Mounted on
/dev/sda5 30G 1.2G 27G 4% /
/dev/sda1 76M 9.2M 62M 13% /boot
/dev/sda2 1.4G 59M 1.3G 5% /var
The ext3 filesystem has three
different journaling modes. The default is ordered and is more conservative/safe then most
other journaling filesystems. Supposedly the writeback mode is more
akin to what other journaling filesystems such as reiserfs use.
According to the man page for mount,
"This is rumored to be the highest-throughput option". We
plan to dispel the rumor, maybe we should submit a patch for the
man page when we are done.
We tested ext3 in both ordered
and writeback modes.
We've heard that the notail option of reiserfs can improve
performance, especially with small files.
We tested reiserfs with and without the the notail option.
Next - PostMark
- kernel -
- PostMark 1.5c
compiled with -O2
generated with OpenOffice
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that he becomes."
- Mohandas K. Gandhi
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