Notes for using oracle11gASM

Notes for using oracle11gASM

1. Configure at least two data groups (replica groups are used to store data files; fra replica roup is used as the archiving and backup of the flash back area). I/O performance problems are mainly considered.

2. In the oracle official documentation, we recommend that each dg have at least 4 disks and the same size and performance. No, I/O will be limited by the disk with the slowest speed

3. The hardware raid strip size is a power of 2 and must be <= asm au size

4. Supported storage:

Disk Partition

A disk partition can be the entire disk drive or a section of a disk drive. Note that A partition cannot be used as a partition table because the partition table will be overwritten.

Logical Unit Number (LUN ):

A lun is a disk presented to a computer system by a storage array. Hard raid is recommended for oracle.

Logical Volume:

A logical volume is supported in less complicated deployments where a logical volume is mapped to a LUN, or a logical volume uses disks or raw partitions. Oracle does not recommend using logical volumes because they have duplicate features on oracle asm.

Network File System (NFS ):

An Oracle ASM disk group can be created from NFS files, including Oracle Direct NFS (dNFS), as well as whole disks, partitions, and LUNs.

Direct NFS can be used to store data files, but is not supported for Oracle Clusterware files.