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Atto/iStoragePro Performance and Testing Overview

Last updated November 07, 2010 - Send Feedback

Performance is a function of the RAID card used and the drives used, since the iStoragePro and similar enclosures do not by themselves provide RAID; the intelligence for RAID resides in the RAID card used.

Because I had only the ATTO R380 to test with, I do not know whether higher performance can be achieved with the Atto R680 or another brand card.

In general, the Atto R380 RAID card does not scale beyond 6 drives or so, throttling performance to lower levels. See the test results on the following pages.

Testing approach

I used the Atto R380 with dual SAS cables to the iStoragePro, which provides slightly higher performance than using a single cable (news to me, but I verified this in testing).

For sequential performance testing, I used DiskTester, with the run-sequential command.

DiskTester is about rigorous testing for serious use, not pretty charts. Example output:

disktester run-sequential --test-size 16GB --iterations 20 --xfer 4M

Example DiskTester output

------------------ Averages for "s8" (16GB/4MB, 20 iterations) -----------------
 Iteration 	Write MB/sec	Read MB/sec
      1    	     751    	    634    
      2    	     752    	    635    
      3    	     752    	    637    
      4    	     750    	    637    
      5    	     749    	    639    
      6    	     750    	    639    
      7    	     753    	    660    
      8    	     750    	    637    
      9    	     754    	    637    
     10    	     752    	    636    
     11    	     757    	    688    
     12    	     754    	    637    
     13    	     751    	    637    
     14    	     754    	    638    
     15    	     750    	    642    
     16    	     748    	    639    
     17    	     752    	    639    
     18    	     746    	    636    
     19    	     749    	    635    
     20    	     750    	    638    
		
  Slowest  	     746    	    634    
  Fastest  	     757    	    688    
  Average  	     751    	    641    
   Median  	     751    	    637    
   Range   	    11.0    	    53.3   

Command "run-sequential" executed in 1075.85 seconds on Saturday, November 6, 2010 4:34:17 PM PT

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