Points to note when using Oracle 11g ASM

1. Configure a minimum of 2 data Group (datagroup), the Fra datagroup as the flash back Zone side archive, backup, etc.) mainly consider the IO performance problem

2. Oracle Official documentation recommends a minimum of 4 disks per DG and the same size and performance. No IO will be limited by the slowest disk

3. The hardware RAID strip size takes the power of 2, and <= asm au sizes

4. Support Storage:

Disk Partition

A Disk Partition can be the entire disk drives or a section of a disk drive. Note Using a disk partition cannot post-partition the table because the partition table is overwritten.

logical Unit number (LUN):

a LUN is a disk presented to a computer system by A storage array. Oracle recommends using hard RAID

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Logical Volume:

A logical   volume  is supported in less complicated configurations where a logical volume are mapped to a LUN, or a lo Gical volume uses disks or raw partitions. Oracle does not recommend the use of logical volumes because they and Oracle ASM have functionality ( mirroring "

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network File System (NFS):

an Oracle ASM Disk group can be created from NFS files, including Oracle Direct NFS (DNFS), as well as W Hole disks, partitions, and luns. 

direct NFS can be used to store data files, but was not supported for Oracle Clusterware FILES.&NBSP;

Points to note when using Oracle 11g ASM