Oracle Database 10g RAC Best Practices: RAC on Linux

Operating System Configuration

• Confirm OS requirements from
  • Platform-specific install documentation
  • Quick install guides (if available) from Metalink/OTN
  • Release notes
• Follow these steps on EACH node of the cluster
  • Configure ssh
    • 10g OUI uses ssh/scp if configured otherwise rsh/rcp
  • Configure Private Interconnect
    • Use UDP and GigE
    • Non-routable IP addresses (eg 10.0.0.x)
    • Redundant switches as std configuration for ALL cluster sizes.
    • NIC teaming configuration (platform dependant)
  • Configure Public Network
    • VIP and name must be DNS-registered in addition to the standard static IP information
    • Will not be visible until VIPCA install is complete

Shared Storage Configuration

• Configure devices for the Voting Disk and OCR file.
  • Voting Disk >= 20MB, OCR >= 100MB.
  • Use storage mirroring to protect these devices
• Configure shared Storage (for ASM)
  • Use large number of similarly sized “disks”
  • Confirm shared access to storage “disks” from all nodes
  • Include space for flash recovery area
• Configure IO Multi-pathing
  • ASM must only see a single (virtual) path to the storage
  • Multi-pathing configuration is platform specific (e.g. Powerpath, SecurePath, …)
• Establish file system or location for ORACLE_HOME
  • (And CRS & ASM HOME)

Use devlabel

• Use devlabel to create a unique binding to the OCR and Voting device.
  • To use the command, as root devlabel add -s /dev/raw/raw1 -d /dev/sda1 devlabel add -s /dev/raw/raw2 -d /dev/sdb1 This will add an entry into /etc/sysconfig/devlabel something like this: /dev/raw/raw1 /dev/sda1 S83.3:6006016024d20c003a3cb11d3484d811DGCRAID5sector1005268 /dev/raw/raw2 /dev/sdb1 S83.3:6006016024d20c003a3cb11d3484d811DGCRAID5sector62
  • The third column is the scsi unique id ( actually it is uuid) which is stored in disk for the life of the LUN and never changes.
• http://www1.us.dell.com/content/topics/global.aspx/power/en/ps1q03_lerhaupt
• http://linux.dell.com/devlabel/devlabel.html

Backing up the OCR and Voting Disk

• After installing Oracle RAC 10g and after ensuring that the system is functioning properly, make a backup of the OCR device and Voting disk.
• In addition, make a backup of the OCR and Voting disk contents after you complete any node additions or node deletions and after running any de-installation procedures.
• Use dd or copy depending if your OCR or Voting files are on raw or OCFS.
  • Please see Note.279793.1 for additional information

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