latest PERC firmware == slow

John Vasileff john.lists at gmail.com
Wed Jul 27 15:28:57 CDT 2005


On 7/27/05, David_Papasan at dell.com <David_Papasan at dell.com> wrote:
>  
> 
> During your PR ON testing, was this in automatic or manual mode ? 
> Manual mode increases the priority of the PR process. Since the user is
> requesting the process vs. it being a background task. 
> 
> This will induce more performance impact, but of course in manual mode you
> can choose when it runs, vs every 4 hours. 

David, thanks for the tip.  Running the benchmark with PR in Auto mode
and "megapr -dispPR -a0" reporting "PR In Progress" resulted in only a
minor slowdown - results below.  My testing has been on a PERC4e/Di. 
I also have PERC4e/DC and PERC3/DC cards in production, but no spares
to test.  Would you expect similar results from them (very minor
slowdown when in Auto mode?)


John


                                    random  random
      KB  reclen   write rewrite      read   write
 1048576      64   77980   89961     14852   29612
 1048576     128   73448   89049     19728   40825
 1048576     256   74210   89697     23565   55687
 1048576     512   74986   85325     39594   63887
 1048576    1024   74716   85667     61100   70254
 1048576    2048   86782   82922     78112   71961
 1048576    4096   78793   84932    108690   82109
 1048576    8192   77972   90026    134780   76716
 1048576   16384   75842   89241    169295   77083



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