Rman io done waits and the rate parameter

we are having very high iodone waits.
and i was wonderign if somone on a list has had to go thru the same issues  

thisis a snap from the statspack reports.

                                                                   Avg
                                                     Total Wait   wait    Waits
Event                               Waits   Timeouts   Time (s)   (ms)     /txn


---------------------------- ------------ ---------- ---------- ------ --------

io done                         7,318,903  5,192,927    122,807     17    146.5
sbtwrite2                       4,240,771          0    126,120     30     84.9
io done                         7,318,903  5,192,927    122,807     17    146.5
 
 

currently we are on gen1 tape drive plannign to move to gen2's the backup of a 1 tbte database takes around 4 hours but the application timings go up by 20%  

i am also looking at ways people have had to use the rate or the readrate parameter to throttle down the amount of i/o and tune down rman.

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http://www.freelists.org/webpage/oracle-l Received on Mon Dec 20 2004 - 08:35:39 CST