RE: To use SAME or NOT for High End Storage Setup ? .... StripeUnit Size 32 MB Vs. 64 KB ?

  • From: "Kevin Closson" <kevinc@xxxxxxxxxxxxx>
  • To: <oracle-l@xxxxxxxxxxxxx>
  • Date: Mon, 15 May 2006 07:49:29 -0700

 >>>array. In both cases performance was fine and there were no "hot"
>>>disks. The logic for choosing 4 MB was to ensure that any 
>>>full table scans (in our case 128 KB) would avoid having the 
>>>multi-block reads split into two reads due to the required 
>>>blocks existing in more than 1 "stripe".

a 4MB stripe width will reduce the odds there will be cross-stripe
reads, but in no way eliminates it. The planets do not align that

>>>IMHO I'm not sure why IBM are recommending why you should go 
>>>as large as 32 MB.

I'm still surprised to hear there is such a thing as a 32MB stripe
width on a DSXXXX array... maybe they meant 32KB (which would be a
trainwreck) ?


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