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

[Sunil Mushran]

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/
>>>   
>>>