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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.<br>
<br>
On 02/02/2011 01:09 PM, Henrique Fernandes wrote:
<blockquote
cite="mid:AANLkTim8uE853D9-WJoT3xr8PrM9GvLLOETBtvk-Ga+m@mail.gmail.com"
type="cite">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>
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