[Ocfs2-users] OCFS2 and berkeley database files

[Alexei_Roudnev]

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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