[Ocfs2-users] Recommended block size for a mail environment
Luis Freitas
lfreitas34 at yahoo.com
Tue Jul 22 07:35:02 PDT 2008
Funny, I could not find a option to specify the number of inodes or the inodes/bytes ratio on mkfs.ocfs2?
Regards,
Luis
--- On Tue, 7/22/08, jab at ufba.br <jab at ufba.br> wrote:
From: jab at ufba.br <jab at ufba.br>
Subject: [Ocfs2-users] Recommended block size for a mail environment
To: ocfs2-users at oss.oracle.com
Date: Tuesday, July 22, 2008, 9:22 AM
Hello all,
I have a mail environment, with a situation seemed with a previous
mail "Different size with du and ls". My environment is:
Debian Etch 4.0
Postfix 2.3.8-2
ocfs2-tools 1.2.1-1.3
kernel 2.6.18-4-amd64
My "df -h" shows me the follow:
df -Th
/dev/sdb1 ocfs2 1,0T 894G 131G 88% /mails
df -Thi
File Syst. Type Inodes IUsed IFree IUse% Mount on
/dev/sdb1 ocfs2 16M 14M 2,1M 88% /mails
but when I do a "du -sh . /mails" it shows me 480GB, so much
different
from 849G. The OCFS2 block size is 4K. I made a script to average the
medium mail size, and it's the follow:
0k to 1k - 8%
0k to 2k - 13%
0k to 3k - 22%
0k to 4k - 35%
4.1k to 6k - 15%
6.1 to 8k - 10%
8.1k to 10k - 9%
10.1k to 12k - 7%
rest - 24%
My debug.ocfs2 doesn't has the "-R" option:
# debugfs.ocfs2 -R "stats" /dev/sdb1
debugfs.ocfs2: invalid option -- R
debugfs.ocfs2 1.2.1
My doubts are:
4k is a good block size for this situation?
How to avoid waste space as now (~50%)?
If I choose to use 2k, will the available Inodes double (16M to 32M)?
Thanks a lot!
Jeronimo
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