Wim Coekaerts Director of Linux Engineering Oracle Corporation

Wim Coekaerts Director of Linux Engineering Oracle Corporation

Oracle Cluster Filesystem on Linux One year Later.

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

OCFS Version 1 Releases Ÿ Beta Release August 2002 – Open source project (GPL license) Ÿ Production October 2002 – Red Hat Advanced Server 2. 1 for IA 32 Ÿ Production February 2003 – United Linux 1. 0 for IA 32 Ÿ Production August 2003 – Red Hat Advanced Server 2. 1 for IPF/IA 64

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

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

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

Do’s and Don’ts Ÿ Red Hat Advanced Server 2. 1 for IA 32 – Use 2. 4. 9 -e. 24 or higher kernel Ÿ Buffer cache management Ÿ Red Hat Advanced Server 2. 1 for IPF – Use 2. 4. 18 -e. 37 or better Ÿ United Linux 1. 0 for IA 32 – Use Service Pack 2 a or better

Do’s and Don’ts (2) Ÿ Updated fileutilities from http: //oss. oracle. com/projects/ocfs – – Dd, cp, tar, md 5 sum, cksum, mv O_direct=yes Ÿ Always use the above utilities with the O_DIRECT option for better performance and reliability Ÿ Use RMAN if possible

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

Do’s and Don’ts (4) Ÿ Use comm_voting=1 in /etc/ocfs. conf Ÿ Async IO support in OCFS 1. 0. 9 with specific kernels (need patch for oracle 9. 2. 0. 4) Ÿ Mix IA 32 and IA 64 nodes – – OCFS is compatible between the nodes Easy move of Oracle between architectures (30 seconds)

Customer story Ÿ Amazon implemented OCFS for a system Ÿ Grant Mc. Alister’s experiences

What is coming next ? Ÿ OCFS Version 2 – – – Shared Oracle Home Binaries and logfiles Faster non database operations Ÿ Other platforms – – Port to AMD 64 for version 1 in progress Port to PPC 64 for version 1 in progress

Q& A QUESTIONS ANSWERS

Next Steps…. Ÿ Recommended sessions – – – Performance and Scalability of Linux in the Enterprise Ÿ Tuesday 11: 00 am Jamshed Patel Improving information Assurance of Linux Ÿ 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. Ÿ Relevant web sites to visit for more information – http: //oss. oracle. com/projects/ocfs

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