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 _______________________________________________ Ocfs2-users mailing list [email protected] http://oss.oracle.com/mailman/listinfo/ocfs2-users
