Instruction Manual

SN0451405-00 Rev. B 07/13 6
WHITE PAPER
Summary and Conclusions
QLogic recommends using the QLogic 10000 Series Fibre Channel Adapter
in an Oracle RAC database with Oracle’s ASM feature and providing LUNs in
a multiple of the nodes in the RAC cluster.
Oracle recommends four LUNs for a disk group and, for best cache
optimization, making the LUN quantity a multiple of the node quantity. At a
minimum, use the following LUN counts:
• Two-node RAC = four LUNs per disk group
– Server1 has cache ownership on LUNs 1 and 3
– Server2 has cache ownership on LUNs 2 and 4
• Three-node RAC = six LUNs per disk group
– Server1 has cache ownership on LUNs 1 and 4
– Server2 has cache ownership on LUNs 2 and 5
– Server3 has cache ownership on LUNs 3 and 6
• Four-node RAC = four LUNs per disk group
– Server1 has cache ownership on LUN 1
– Server2 has cache ownership on LUN 2
– Server3 has cache ownership on LUN 3
– Server4 has cache ownership on LUN 4
Repeat the pattern to ensure that the LUN caching is distributed evenly
across the LUNs. Because the Oracle ASM balances the I/O load across the
LUNs, this configuration provides the best caching performance.