The following are guidelines for preparing
storage for use with Oracle ASM:
- A minimum of four LUNs (Oracle
ASM disks) of equal size and performance is recommended for each disk
group.
- Ensure that all Oracle ASM
disks in a disk group have similar storage performance and availability
characteristics. In storage configurations with mixed speed drives, such
as 10K and 15K RPM, I/O performance is constrained by the slowest speed
drive.
- Oracle ASM data distribution
policy is capacity-based. Ensure that Oracle ASM disks in a disk group
have the same capacity to maintain balance.
- Create external redundancy disk
groups when using high-end storage arrays. High-end storage arrays
generally provide hardware RAID protection. Use Oracle ASM mirroring
redundancy when not using hardware RAID, or when you need host-based
volume management functionality, such as mirroring across storage systems.
You can use Oracle ASM mirroring in configurations when mirroring between
geographically-separated sites (extended clusters).
- Minimize I/O contention between
Oracle ASM disks and other applications by dedicating disks in Oracle ASM
disk groups.
- Choose a hardware RAID stripe
size that is a power of 2 and less than or equal to the size of the Oracle
ASM allocation unit.
- For Linux, use the Oracle
ASMLib feature to provide consistent device naming and permission
persistency.
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