[Ocfs2-users] Ofcs2 Questions!

[Henrique Fernandes]

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.

No other docs for performance improvement for maildir ?

[]'sf.rique


On Thu, Feb 3, 2011 at 4:40 AM, Antonis Kopsaftis <akops at teiath.gr> wrote:

>  Hello,
>
> 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
> not be fixed, as the 2.6.18 kernel that centos 5.x  has is very very old.
> 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
>
> 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
> filesystem, althought i was happy with ocfs2.
>
> akops
>
>
>
> On 3/2/2011 3:10 πμ, Henrique Fernandes wrote:
>
> centos 5.5
> ocfs2 1.4
> 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
>
> How many memory do you thing i should separeted for cache ?
>
> 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.
>
> And it is a problem to have ocfs2 1.6 in ths centos!!
>
> Should i use ocfs2 in production ?
>
> how about the commit and noatime configs ??
>
>
> thanks!!
>
> []'sf.rique
>
>
> On Wed, Feb 2, 2011 at 9:27 PM, Sunil Mushran <sunil.mushran at oracle.com>wrote:
>
>>  version? distro?
>>
>> This workload will benefit a lot with the indexed directories available in
>> ocfs2 1.6 (and mainline and sles11).
>>
>> The other thing to check is the amount memory in the virtual machines.
>> File systems need memory to cache the inodes. If memory is lacking,
>> the inodes are freed and have to be re-read from disk time and again.
>> While this is a problem even in a local fs, it is a bigger problem in a
>> cfs
>> as a cfs needs to do lock mastery for the same inode time and again.
>>
>>
>> On 02/02/2011 01:09 PM, Henrique Fernandes wrote:
>>
>>  Hello,
>>
>> First of all, i am new at the list and i have several questions about
>> ocfs2 performance.
>>
>> Where i am working i am having huge performance problens with ocfs2.
>>
>> Let me tell my envoriment.
>>
>> 3 Xen VirtualMachines withs ocfs2 mounting an LUN exported over iSCSI. (
>> acctualy 3 LUNS, 3 ocfs2 clusters )
>>
>> I am not the one who configured the envoriment, but it is making the
>> performance of my MAIL system to bad.
>>
>> Have about 9k accounts but only 4k are active. It is a maildir system. (
>> postfix + dovecot )
>>
>> Now that this performance problens are afecting my system i am gonna try
>> help to tunning the ocfs2.
>>
>> Pretty much all default settings.
>>
>> 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.
>>
>> Now we are going to implemente noatime options in mount. This make better
>> performace ?
>>
>> 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?
>>
>> Does anyone have any other paramenter that should help us ?
>>
>> Another info, the inscremental backup is taking 10 to 12 hours.
>>
>> All nodes have VERY high I/O wait.
>>
>> Thanks to all!!
>>
>> If you could tell me any doc that i sould read would be nice to!
>>
>>
>>
>>
>>
>>
>> []'sf.rique
>>
>>
>> _______________________________________________
>> Ocfs2-users mailing listOcfs2-users at oss.oracle.comhttp://oss.oracle.com/mailman/listinfo/ocfs2-users
>>
>>
>>
>
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