[Beowulf] bad bonnie++ in 14-drive RAID 10

stephen mulcahy smulcahy at atlanticlinux.ie
Wed Sep 16 07:18:27 EDT 2009


I'm not sure what else people read from bonnie++ results but I normally 
focus on the sequential output block (which I think of as "block write 
speed" and sequential input block (which I think of as "block read 
speed"). Smarter folk on this list may be able to provide a more 
scientific analysis of your results than that though.

In your case, I'm reading the results below as a block write speed of 
455 MB/sec and a block read speed of 528 MB/sec which seems pretty good 
to me (unless my math has failed me). What kind of performance are you 


Eugen Leitl wrote:
> Below bonnie++ stats are pretty bad for a RAID 10 of 14 SATA
> drives (WD RE4, 2 TByte), right?
> [oracle at localhost data]$ bonnie++ -d /data/blah
> Writing with putc()...done
> Writing intelligently...done
> Rewriting...done
> Reading with getc()...done
> Reading intelligently...done
> start 'em...done...done...done...
> Create files in sequential order...done.
> Stat files in sequential order...done.
> Delete files in sequential order...done.
> Create files in random order...done.
> Stat files in random order...done.
> Delete files in random order...done.
> Version  1.03       ------Sequential Output------ --Sequential Input- --Random-
>                     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
> Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
> localhost.lo 47320M 82406  99 466201  46 124266  17 73482  96 541644  33 415.4   0
>                     ------Sequential Create------ --------Random Create--------
>                     -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
>               files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
>                  16  5488   4 +++++ +++  4292   0  3883   3 +++++ +++  2580   1
> localhost.localdomain,47320M,82406,99,466201,46,124266,17,73482,96,541644,33,415.4,0,16,5488,4,+++++,+++,4292,0,3883,3,+++++,+++,2580,1

Stephen Mulcahy     Atlantic Linux         http://www.atlanticlinux.ie
Registered in Ireland, no. 376591 (144 Ros Caoin, Roscam, Galway)
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