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Sequential I/O with RAID-5 and RAID-10

  • 1.  Sequential I/O with RAID-5 and RAID-10

    Posted 02/06/11 12:10 PM

    Originally posted by: db2girl_bella


    On p.18 of the following presentation ( http://www.wmduszyk.com/wp-content/u...n_Nasypany.pdf ), it's mentioned:
    "N disk RAID 5 arrays can handle no more than N-1 sequential IO
    streams before the IO becomes randomized

    N disk RAID 10 arrays can do N sequential read IO streams and N/2
    sequential write IO streams before the IO becomes randomized"
    Is (N-1) for RAID-5 because of parity disk and (N/2) for RAID-10 because of disk mirroring? Could you please provide some additional details?
    Thanks.
    #AIX-Forum


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