Home Page for the TeradataForum

Archives of the TeradataForum

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

  <Prev Next>   <<First <Prev

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

  <Prev Next>   <<First <Prev
  Top Home Privacy Feedback  
Copyright for the TeradataForum (TDATA-L), Manta BlueSky    
Copyright 2016 - All Rights Reserved    
Last Modified: 27 Dec 2016