2. Wim Coekaerts Director of Linux Engineering Oracle Corporation

3. Oracle Cluster Filesystem on Linux One year Later.

4. What is a CFS ?  Shared Disk Cluster Filesystem  Improve management of data for Oracle Real Application Clusters (RAC)  Customer demand for a CFS to run RAC  Open solution on the Operating System side (Linux) free and open source

5. OCFS Version 1 Releases  Beta Release August 2002 – Open source project (GPL license)  Production October 2002 – Red Hat Advanced Server 2.1 for IA32  Production February 2003 – United Linux 1.0 for IA32  Production August 2003 – Red Hat Advanced Server 2.1 for IPF/IA64

6. What did we solve ?  255 raw device limit on Linux  Difficult to manage raw disk  Single view of data files across all nodes  Use of standard OS tools (modified) to handle backups

7. What didn’t we solve yet ?  Shared Oracle Home installation  Binaries and generic file support on CFS  Support for other applications (ISV applications)  Volume management  Dynamic resizing of partitions  Defragmentation of filesystem  Online FSCK

8. Customer Experiences  Large number of production customers today  Easy installation and configuration of CFS  IO throughput is equivalent to RAW IO  Use of the default OS tools can cause slow throughput and kernel issues.  After a few months more requests for generic filesystem support

9. Do’s and Don’ts  Red Hat Advanced Server 2.1 for IA32 – Use 2.4.9-e.24 or higher kernel  Buffer cache management  Red Hat Advanced Server 2.1 for IPF – Use 2.4.18-e.37 or better  United Linux 1.0 for IA32 – Use Service Pack 2a or better

10. Do’s and Don’ts (2)  Updated fileutilities from http://oss.oracle.com/projects/ocfs http://oss.oracle.com/projects/ocfs – Dd, cp, tar, md5sum, cksum, mv – O_direct=yes  Always use the above utilities with the O_DIRECT option for better performance and reliability  Use RMAN if possible

11. Do’s and Don’ts (3)  Use a large blocksize for IO  Avoid small allocations (use 1MB and larger)  Separate archive log files from datafiles  If possible separate out in separate directories  Spread load of files across number of volumes (don’t use 1 volume for everything) – Having one volume causes IO bottlenecks  Use large autoextend size

12. Do’s and Don’ts (4)  Use comm_voting=1 in /etc/ocfs.conf  Async IO support in OCFS 1.0.9 with specific kernels (need patch for oracle 9.2.0.4)  Mix IA32 and IA64 nodes – OCFS is compatible between the nodes – Easy move of Oracle between architectures (30 seconds)

13. Customer story  Amazon implemented OCFS for a system  Grant McAlister’s experiences

14. What is coming next ?  OCFS Version 2 – Shared Oracle Home – Binaries and logfiles – Faster non database operations  Other platforms – Port to AMD64 for version 1 in progress – Port to PPC64 for version 1 in progress

15. A Q & Q U E S T I O N S A N S W E R S

16. Next Steps….  Recommended sessions – Performance and Scalability of Linux in the Enterprise  Tuesday 11:00 am Jamshed Patel – Improving information Assurance of Linux  Tuesday 5:00 pm Mary Ann Davidson – Visit the DEMOgrounds for a customized architectural review, see a customized demo with Solutions Factory, or receive a personalized proposal. Visit the DEMOgrounds for more information.  Relevant web sites to visit for more information – http://oss.oracle.com/projects/ocfs

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