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Message Posted: Thu, 27 Oct 2005 @ 09:12:22 GMT


     
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Subj:   Re: Anyone using Raid 5
 
From:   Hough, David A

We used to use Raid-5 on 5150s but the write I/O was much slower than Raid-1 so we never seriously considered it on the 5350/5400 systems. The problem is the extra reads needed for parity update:

Raid-1: Write Primary, Write Mirror

Raid-5: Write Primary, Read Secondary#1, Read Secondary#2, Compute

Parity, Write Parity

Multiply by two for fallback.


The storage gain is really tempting, I know, but I'd recommend against it.


/dave hough



     
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