ASM 4 Disks Per Diskgroup

ASM Disks Per Diskgroup To avoid kernel contention, a minimum of four LUNs (Oracle ASM disks) of equal size and performance is recommended for each disk group. Do you plan to have more than 4 disk groups? 1 TB HDD are usually faster than older 500 GB. 4 Disks Per Diskgroup Oracle Doc 4 Disks […]

RAC Networking Considerations

Networking Considerations For the private network 10 Gigabit Ethernet is highly recommended, the minimum requirement is 1 Gigabit Ethernet. Underscores are not be used in a host or domain name according to RFC952 – DoD Internet host table specification. The same applies for Net, Host, Gateway, or Domain name. The VIPs and SCAN VIPs must […]

Top 5 Issues That Cause Node Reboots or Evictions or Unexpected Recycle of CRS

(Doc ID 1367153.1) Issue #1: The Node rebooted, but the log files do not show any error or cause. Issue #2: The node rebooted because it was evicted due to missing network heartbeats. Issue #3: The node rebooted after a problem with storage. The ocssd.log file shows that the node rebooted because it cannot access […]

VMWare Disk

VMWare Disk for RAC

RAC VIPs

These are good references for VIPs involved in RAC VIP Concepts

RAC Attack 12c

RAC Attack

12c RAC Master Note

12c Alert File Location RAC 12c Articles

RAC Log File Locations

RAC Log File Locations If you are using Oracle RAC (doesn’t matter how many nodes you have) You need to know where log files are located. The Cluster Ready Services Daemon (crsd) Log Files Log files for the CRSD process (crsd) can be found in the following directories:               […]

UDEV again

Directories for RAC

Filesystems /oracle – binaries for the database software 50GB – 100GB (enough for the current binaries as well as upgrade or download if necessary) /oracle_crs – binaries for the grid infrastructure 50GB – 100GB (enough for the current binaries as well as upgrade or download if necessary) /ora01 – at least 100GB for each server […]