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Hello,<br>
<br>
My setup consists with 2 backend mail servers, running
dovecot/postfix/mailscanner in primary/secondary mode. The primary
server has 6GB ram, and the seconadary a virtual machine with 2GB
ram. Both servers using a external SAN over fiber. I have over
15.000users, and the performance is very good without using any
exotic performance tips. I just mount the filesystem with noatime. I
ran this setup for almost a year without any problems.<br>
After the discovery of the bug that ocfs2 has last October , and the
notification from oracle people, that the bug will not be fixed, i
searched for an alternative filesystem. <br>
So during December i moved all my user files to gfs2. On the same
setup gfs2 is a little slower than ocfs2.<br>
<br>
I have another cluster (not mail) running with ocfs2. Sadly i have
to change that too...<br>
<br>
Regards,<br>
akops<br>
<br>
<br>
<br>
<br>
<br>
On 3/2/2011 7:45 μμ, Henrique Fernandes wrote:
<blockquote
cite="mid:AANLkTi=xtBOY3g2hSJH8ga9yv81Nu_B82t63tYXE2hmi@mail.gmail.com"
type="cite">I just read some, the problems is it will be to
difficult to us to migrate it now. Because they migrate into ocfs2
quite recently.<br>
<br>
No other docs for performance improvement for maildir ?<br>
<br clear="all">
[]'sf.rique <br>
<br>
<br>
<div class="gmail_quote">On Thu, Feb 3, 2011 at 4:40 AM, Antonis
Kopsaftis <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:akops@teiath.gr">akops@teiath.gr</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid
rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left:
1ex;">
<div bgcolor="#ffffff" text="#000000"> Hello,<br>
<br>
You should read the archives of this list on Oct/Nov 2010.
The ocfs2 1.4 has the "No space left on device error" bug
which (according to oracle people on this list) will<br>
not be fixed, as the 2.6.18 kernel that centos 5.x has is
very very old.<br>
You can try to install the Unbreakable Kernel from oracle,
but dont count on it. I tried it and my system was pretty
messed up<br>
<br>
I was using ocfs2 with a setup pretty like
yours(dovecot/qmail/mailscanner) in production, and it
worked very well, but because of the bug, i had to switch to
another<br>
filesystem, althought i was happy with ocfs2.<br>
<br>
akops
<div>
<div class="h5"><br>
<br>
<br>
On 3/2/2011 3:10 πμ, Henrique Fernandes wrote:
<blockquote type="cite">centos 5.5 <br>
ocfs2 1.4<br>
The mail solution, dovecot+postifx+mailscaner uses
about 1 gb the machine has 1.5 in my tests i am rising
it to 3gb so it have 2gb of cached<br>
<br>
How many memory do you thing i should separeted for
cache ?<br>
<br>
When we made some tests ocfs2 1.4 had better
performance than 1.6 but or tests were very simple, an
script that writes lots of files and anothe rone that
reads it.<br>
<br>
And it is a problem to have ocfs2 1.6 in ths centos!!<br>
<br>
Should i use ocfs2 in production ?<br>
<br>
how about the commit and noatime configs ??<br>
<br>
<br>
thanks!!<br>
<br clear="all">
[]'sf.rique <br>
<br>
<br>
<div class="gmail_quote">On Wed, Feb 2, 2011 at 9:27
PM, Sunil Mushran <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:sunil.mushran@oracle.com"
target="_blank">sunil.mushran@oracle.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="border-left:
1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt
0.8ex; padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000"> version?
distro?<br>
<br>
This workload will benefit a lot with the
indexed directories available in<br>
ocfs2 1.6 (and mainline and sles11).<br>
<br>
The other thing to check is the amount memory in
the virtual machines.<br>
File systems need memory to cache the inodes. If
memory is lacking,<br>
the inodes are freed and have to be re-read from
disk time and again.<br>
While this is a problem even in a local fs, it
is a bigger problem in a cfs<br>
as a cfs needs to do lock mastery for the same
inode time and again.
<div>
<div><br>
<br>
On 02/02/2011 01:09 PM, Henrique Fernandes
wrote: </div>
</div>
<blockquote type="cite">
<div>
<div>Hello,<br>
<br>
First of all, i am new at the list and i
have several questions about ocfs2
performance.<br>
<br>
Where i am working i am having huge
performance problens with ocfs2.<br>
<br>
Let me tell my envoriment.<br>
<br>
3 Xen VirtualMachines withs ocfs2 mounting
an LUN exported over iSCSI. ( acctualy 3
LUNS, 3 ocfs2 clusters )<br>
<br>
I am not the one who configured the
envoriment, but it is making the
performance of my MAIL system to bad.<br>
<br>
Have about 9k accounts but only 4k are
active. It is a maildir system. ( postfix
+ dovecot )<br>
<br>
Now that this performance problens are
afecting my system i am gonna try help to
tunning the ocfs2.<br>
<br>
Pretty much all default settings.<br>
<br>
OCFS2 is configured to write with ordered
mode. We know that changing to writeback
will make performance much better, but we
are not considering lose anydata, so it i
snot an option.<br>
<br>
Now we are going to implemente noatime
options in mount. This make better
performace ?<br>
<br>
Other one, how about the commit mount
options ? The default is set to 5s if i
increse it how is the potential data loss
in case we lost lose power?<br>
<br>
Does anyone have any other paramenter that
should help us ?<br>
<br>
Another info, the inscremental backup is
taking 10 to 12 hours. <br>
<br>
All nodes have VERY high I/O wait.<br>
<br>
Thanks to all!!<br>
<br>
If you could tell me any doc that i sould
read would be nice to!<br>
<br>
<br>
<br>
<br>
<br>
<br clear="all">
[]'sf.rique <br>
</div>
</div>
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<pre cols="72">--
============================================================
____________
| __________ |\\ .....................................
|| 0 0 || | . . Κοψαύτης Αντώνης . .
|| J || | . . System Administrator . .
|| [___] || | . . Κέντρο Διαχείρισης Δικτύου . .
||__________|| | . . ΤΕΙ Αθήνας . .
| __________ | | . . 210-5385790 . .
| ______==== | | . . <a moz-do-not-send="true" href="mailto:akops@teiath.gr" target="_blank">akops@teiath.gr</a> . .
| __________ | | . . VMware Certified Professional . .
|____________|/ .....................................
=============================================================
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