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

[Sunil Mushran]

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/
>