Thanks for the tips.<br><br>So you are saying that if both nodes have same load, inscrease comit time will not make any diferences ?<br><br><br><br clear="all">[]'sf.rique <br>
<br><br><div class="gmail_quote">On Wed, Feb 2, 2011 at 11:54 PM, Sunil Mushran <span dir="ltr"><<a href="mailto:sunil.mushran@oracle.com">sunil.mushran@oracle.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000">
# grep "Resources" /sys/kernel/debug/o2dlm/UUID/dlm_state<br>
Lock Resources: 20713 (1139459)<br>
<br>
The first number is number of live resources. Second the number<br>
of resources created for the life of the domain.<br>
<br>
If you see the the number of resources levelling off but the second<br>
number incrementing, that _could_ mean that you could benefit with<br>
a larger cache. But you have to supplement that number with the<br>
workload. Say you are deleting and creating files. In that case, you<br>
will see the same number movement but not because of the cache
limit.<br>
<br>
We are in the process of adding more counters to provide more
visibility<br>
to the users.<br>
<br>
Well, using any software without support has its risks.<br>
<br>
Using noatime will help. Increasing commit will help if workload if
largely<br>
from one node only.<div><div></div><div class="h5"><br>
<br>
On 02/02/2011 05:10 PM, 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 href="mailto:sunil.mushran@oracle.com" target="_blank">sunil.mushran@oracle.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); 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>
<pre><fieldset></fieldset>
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