we just had a discussion about performance the other day, there are
notes in webiv describing performance characteristics of raw/ocfs vs
ext3, the baisic point is that to move to rac, what you do is you give
All available memory to oracle's buffercache, don't leave it free for
the OS to use nad you will see things scale way better.
if you leave a ton of free memory for the os, it will use it to cache
data, which means reads are cached reads more so than on raw/cfs
in rac, we Need sync read/write, so it has to awlays come from disk and
go to disk , unless ORACLE caches it, not the OS.
you can start creating on ext3 and then move to ocfs, that should not be
an issue (just make sure to use dd --o_direct=yes, with a large
blocksize eg bs=10M from our fileutils)
wim
On Fri, Nov 14, 2003 at 01:37:30AM -0300, Priscilla Marques
wrote:>
> Hi,
>
> I am currently involved in a project with E-Business 11i.9.
>
> For the production enviroment, ct. wants to implement Load Balance and
> Fail Over - both middle tier and database tier, the last with RAC.
>
> As E11i creates lots of tablespaces, the best way seems to be OCFS.
>
> We installed & configured OCFS partitions.
>
> The next step was to install E11i multi tier, single instance - already
> indicating the OCFS device as the proper datafiles place.
>
> However, it seems the installation performed on the test server was
> quicker.
>
> In the test instance, we have EXT3 filesystem - as there is no RAC
> associated.
>
> Should I have indicated the OCFS for the E11i install ? OR I should have
> installed those first on a EXT3, and after that copied then to the OCFS
> partitions ?
>
> Maybe once I migrate the database to RAC this problem may be solved ?
>
> I would apreciate any suggestions/tips.
>
> Thanks,
> Priscilla Marques
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