Book Collaborations

Oracle Database11g Direct NFS clonedb Related Content:


The seminal Oracle whitepaper on DBFS:   here or here. Quote:


We are thankful to Mr. Juan Loaiza for giving us the opportunity to employ the Sun Oracle Database Machine setup for the preliminary performance evaluation. We also thank Kevin Closson for assisting us with the hardware setup as well as conducting the performance tests on DBFS.

Some Papers


SLB (Silly Little Benchmark) Tar Archive 30 November 2010

16 Responses to “Papers, Webcasts, etc”

  1. 1 newsterrorist August 11, 2007 at 10:49 am

    Gidday Kevin. The link “PolyServe’s ODM I/O Monitoring User Guide” doesn’t work. Love this site – just found it.

  2. 2 Krishna November 17, 2007 at 6:41 pm

    Hi Kevin,

    Regarding the HP Enterprise File Service NAS gateway device, I remember reading in an earlier post that you were part of the team benchmarking the device before you moved to Oracle.

    Does the Enterprise File Service NAS gateway device do double-caching (At the NAS and the SAN) or simply passes the request onto the SAN device behind it? I could not find much information about this aspect in the whitepaper. Also regarding snapshots – does it need to be done on the Array or does the NAS gateway do snapshots on it’s own?


  3. 3 kevinclosson November 17, 2007 at 8:37 pm


    The EFS Clustered Gateway will serve files from its filesystem using direct I/O if you wish, so the cache model using Oracle in that case would be:

    SGA->SAN Array Cache->Track Buffer per drive

    The layers omitted are the the page cache on the DB server (NFS client) since Oracle uses O_DIRECT opens and the page cache on the NAS heads in the CG since you would tend to mount file systems with the EFS CG DBOptimized mount option…although testing might show you much improved performance allowing the NAS gateway heads to cache as well.

    I’m not at HP any longer, but I know that it isn’t until the next major release of the EFS CG software (runs in the NAS heads analogous to NetApp OnTap) that the product will support snapshots in the NAS tier. So, today you have to use the downwind EVA/XP snapshots and replication (e.g., EVA CA).

    Yes, I did the testing and was in fact the Chief Architect of all Oracle solutions on that platform. If I hadn’t been, there would be no Oracle support on the EFS CG since there was a significant bit of correctness that needed to be architected early on.

  4. 4 George July 28, 2009 at 5:10 am

    Hi there

    Sure it got mentioned some where, where is episode 3 of Oracle Exadata Storage Server Technical Deep Dive. I see 1,2 and 4.



  5. 6 George July 28, 2009 at 5:31 am

    Hi there

    ahh, ok so not posted yet, still trying to dig yourself out of the mountain size pile of work then.


  6. 7 OBoy October 6, 2009 at 11:29 am


    Regarding Exadata V1, is it logically possible to build a non-Oracle supplied DBM?
    e.g. procure and build 8 x DL360s and 14 x DL180s. Create a 8 node RAC configuration across the 360s using the storage presented by the dedicated storage servers (180s). If so, how would the storage be presented to ASM from the 14 nodes as one logical pool? Would ASM have the capability to direcly manage disk mirroring? Would i need to configure the dedicated storage servers built out in the cab independently to expose block data to all of the RAC compute nodes? If so, how – global network block devices/cluster lvm/GFS etc?

    Look fwd to hearing from you.


  7. 8 Rasike August 23, 2010 at 5:53 pm

    Hi Kevin,

    Any thoughts on DB2 Purescale technology ? compared to RAC / Exadata ?


    • 9 kevinclosson August 23, 2010 at 8:28 pm

      >Any thoughts on DB2 Purescale technology ? compared to RAC / Exadata ?

      I’ve had no personal experience and have not studied what is publicly available regarding the topic so, no, I don’t have any thoughts on the matter yet. Sorry. As an aside, I’m sure there are plenty of folks that have neither read the materials nor touched the technology that would be more then excited the tell you all that is wrong with the technology. That’s just not my style.

  8. 10 karthikeyan February 9, 2011 at 6:48 am

    Your blog is quite informative, I would like to receive your articles, tips, article through mail. Please include me in your group.


  9. 11 sara B August 28, 2012 at 12:29 pm

    Kevin, great information on your blog. Do you have Greenplum solution design, implementation and performance papers, webcasts and material as well?

  1. 1 Oracle Exadata Storage Server Technical Deep Dive – Part IV « Kevin Closson’s Oracle Blog: Platform, Storage & Clustering Topics Related to Oracle Databases Trackback on June 18, 2009 at 8:58 pm
  2. 2 Oracle 11.2 (aka 11gR2) : DBFS et SecureFile Provider Store « IT Corporate Solutions Trackback on September 17, 2009 at 8:50 am
  3. 3 My Brief Review of Expert Oracle Exadata « Tyler Muth’s Blog Trackback on August 12, 2011 at 4:26 pm
  4. 4 A Tip About the ORION I/O Generator Tool « Kevin Closson's Blog: Platforms, Databases and Storage Trackback on October 31, 2011 at 10:48 pm

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