RedoLog/writer clarification

Hi all,
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   What is the need to mirror a log file if it is multiplexed? If mirroring is to protect against hardware failure and multiplexing is to protect against software corruption (or accidental deletion of log files), when you multiplex it you create different copy in a different disk (hopefully). Wouldnt that make mirroring unnecesary? If you can mirror log files, well and good, not a must; but just make sure it is multplexed. How is this assumption?

    While on it, I am curious about Log writer slaves. Does each slave write to a different log member in the log group? (I was thinking it wouldnt make any sense for multiple processes trying to write to the same file, that too when writing is sequential - I might be wrong) .=20 Are LGWR slaves still being used in 9i/10g?   =20
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Thanks,
Ram.

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