[Ocfs2-users] OCFS2 and berkeley database files

[Sunil Mushran]

Who said it was impossible across servers?

Alexei_Roudnev wrote:
> I can understand BerkleyDB, but why LDAP use shared/writable mmap?
>
> PS. How do you manage to implement shared writeble mmap in OCFSv2 if it's
> almost impossible between the servers? /Just curious/
>
>
> ----- Original Message ----- 
> From: "Sunil Mushran" <Sunil.Mushran at oracle.com>
> To: "Alexei_Roudnev" <Alexei_Roudnev at exigengroup.com>
> Cc: <hartmut.woehrle at mail.pcom.de>; "Michael Wood" <michael.wood at uct.ac.za>;
> <ocfs2-users at oss.oracle.com>
> Sent: Wednesday, December 06, 2006 1:47 PM
> Subject: Re: [Ocfs2-users] OCFS2 and berkeley database files
>
>
>   
>> ocfs2 supports private mmap r/w and shared mmap readonly.
>> Shared mmap writeable is the only piece missing. We should have that by
>>     
> 1.4.
>   
>> Alexei_Roudnev wrote:
>>     
>>> There was a clear answer, WHY it did not worked on OCFSv2:
>>>
>>> - BerkleyDB and LDAP uses mmap to the files;
>>> - OCFSv2 don't implement it (because it is not possible to do such
>>>       
> mapping
>   
>>> in the cluster FS)
>>> - So they dont work on OCFSv2
>>>
>>> Am I correct?
>>>
>>> ----- Original Message ----- 
>>> From: <hartmut.woehrle at mail.pcom.de>
>>> To: "Michael Wood" <michael.wood at uct.ac.za>
>>> Cc: <ocfs2-users at oss.oracle.com>
>>> Sent: Wednesday, December 06, 2006 2:33 AM
>>> Subject: Re: [Ocfs2-users] OCFS2 and berkeley database files
>>>
>>>
>>> Am Mi, 6.12.2006, 09:35, schrieb Michael Wood:
>>>
>>>
>>>       
>>>> Berkeley DB does have problems with certain filesystems (e.g.
>>>> NFS) so maybe this is a similar issue.  (Just a wild guess.)
>>>>
>>>>
>>>>         
>>> Yes I found the Orcale FAQ. So it is s structural problem with a
>>>       
> "simple"
>   
>>> DB and then trying to open it more than once
>>>
>>>
>>>
>>>       
>>>> OpenLDAP supports various different backends.  Maybe one of the
>>>> others will work better?
>>>>
>>>>
>>>>         
>>> Perhaps, but my guess is, that the funktionality of an cluster
>>>       
> filesystem
>   
>>> always uses an access to every file, even if it is not connected to a
>>> service. So I think it will not work if theses files are not able to
>>> handle more than one access at one time.
>>>
>>>
>>>       
>>>> Cyrus also supports various different database types for its
>>>> databases.  Maybe try one of the others.  I have never used either
>>>>
>>>>         
>>> OpenLDAP
>>>
>>>       
>>>> or Cyrus on ocfs2, so I can't guarantee anything :)
>>>>
>>>>         
>>> Same as above
>>>
>>>
>>>       
>>>>> Server is a DELL Poweredge with EMC CLARiiON SAN
>>>>> System SuSE SLES9 SP3+
>>>>> ->  2.6.5-7.244-smp Kernel with (...> modinfo ocfs2):
>>>>> license:        GPL
>>>>> author:         Oracle
>>>>> version:        1.1.7-SLES 5AF01E6455FC04917FE52FB
>>>>> description:    OCFS2 1.1.7-SLES Tue Nov  1 14:45:27 PST 2005 (build
>>>>> sles) depends:        ocfs2_nodemanager,ocfs2_dlm,jbd
>>>>> supported:      yes
>>>>> vermagic:       2.6.5-7.244-smp SMP gcc-3.3
>>>>>
>>>>>
>>>>>           
>>>> [snip]
>>>>
>>>>
>>>> 2.6.5-7.244 was released with SLES9 SP3.  You might want to
>>>> patch your box to 2.6.5-7.282 (which I think is the latest.)
>>>>
>>>> The 7.282 version of the SLES9 SP3 kernel comes with ocfs2
>>>> version 1.2.1-SLES.
>>>>
>>>>         
>>> Yes, but this EMC multipath software installs some kernelmodules
>>> (binaries, no sources) and they only match with the kernels in the list.
>>> So I have to wait for the next release :(((
>>>
>>>
>>>       
>>>> On the ocfs2 homepage it says:
>>>>
>>>>
>>>> SuSE Linux Exterprise Server 9: OCFS2 1.2.1 is bundled
>>>> with the SLES9 SP3 (2.6.5-7.257 and later) release. SLES9 users must
>>>> upgrade to the latest SP3 kernel (2.6.5-7.257 or later) and install
>>>> ocfs2-tools and ocfs2console packages. For more on OCFS2 bundling with
>>>> SLES9, refer to the Novell SLES9 section in the FAQ
>>>>
>>>>
>>>>         
>>> See above
>>>
>>>
>>>       
>>>> --
>>>> Michael Wood <michael.wood at uct.ac.za>
>>>>
>>>>
>>>>
>>>>         
>>>
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>>>
>>>
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>>>       
>
>