[Ocfs2-users] OCFS2 Block / Clustersize with Oracle 10gR2

[Brian Long]

Thanks Sunil.  We are also familiar with Swingbench which does a good
job are stressing Oracle via transactions.  It does not stress the back-
end IO subsystem (at least not in our findings).

/Brian/

On Thu, 2006-11-09 at 11:51 -0800, Sunil Mushran wrote:
> http://www.dominicgiles.com/swingbench.html  ??
> 
> Brian Long wrote:
> > The DBA wrote a patented Java-based application which stress tests the
> > Oracle IO subsystem.  We use this to benchmark our IO subsystems
> > (compare SAN to NAS, etc).  This same benchmark is showing a maximum
> > sustained throughput of 3,400 IO/sec while the same benchmark with the
> > same data will max out at 7K+ IO/sec on RAW.
> >
> > I'll grab the iostat data which we've kept over time and try to make
> > some sense of it before posting anything additional.
> >
> > Thanks.
> >
> > /Brian/
> >
> > On Thu, 2006-11-09 at 10:20 -0800, Sunil Mushran wrote:
> >   
> >> Why are you looking at iops and not the io thruput?
> >>
> >> What is the actual io thruput? Please could you share some iostat
> >> numbers with us. In all our tests, we've seen very little difference
> >> in the actual io thruput between raw and ocfs2.
> >>
> >> Clustersize will mainly affect the alloc/dealloc performance. It has very
> >> little role to play in io performance. If anything, it could help coalesce
> >> requests to reduce number of ios (read cdbs) required to do the task.
> >>
> >> Brian Long wrote:
> >>     
> >>> Hello,
> >>>
> >>> I followed the user's guide recommendation of 4K block size and 128K
> >>> cluster size.  I have 8 32GB OCFS2 filesystems mounted on two nodes.
> >>> The DBA has created a large tablespace with 4GB data files on each
> >>> filesystem.
> >>>
> >>> The performance is only getting 3,400 IO/sec read/write combined.  If I
> >>> re-use the LUNs and give the DBA 4GB raw partitions, he can get over
> >>> 7,000 IO/sec read/write combined (single-node) and over 11,000 IO/sec on
> >>> two nodes.
> >>>
> >>> What's my next step to improve performance of OCFS2?  Since the DBA is
> >>> using 4GB datafiles, should I increase the cluster size to the max 1MB?
> >>>
> >>> Thanks for any hints.
> >>>
> >>> /Brian/
> >>>   
> >>>       
-- 
       Brian Long                             |       |
       IT Infrastructure                  . | | | . | | | .
       Data Center Systems                    '       '
       Cisco Enterprise Linux                 C I S C O