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RAID and multiplexing

EXPERT RESPONSE FROM: Brian Peasland

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QUESTION POSED ON: 23 December 2002
Which raid level of harddisk should we use when multiplexing in Oracle9i?

RAID does not support multiplexing. RAID 1, however, does support mirroring. Mirroring and multiplexing are two different animals. In mirroring, you have two copies of the same datafile, stored on two different disks. In multiplexing, you have more than one copy of the same information, but they are stored in different datafiles. Control files and online redo logs should be multiplexed. They can be mirrored, but they should always be multiplexed.

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