PERC 5 and PERC 6 performance notes

[John LLOYD]

> On Wed, Dec 03, 2008 at 09:28:40AM -0800, John LLOYD wrote:
> > A few months ago I posted a message about RAID-0 
> performance not meeting
> > expectations with PERC5 and PERC6 controllers (we have PERC5/e on
> > PE6850s and PERC6/e on R900s).
> > 
> > Well, of course, after updating the firmware last month, 
> the performance
> > is substantially improved, at least on the PERC6.  (I used 
> bonnie++ to
> > perform these tests).
> 
> Would you be willing to post the exact bonnie++ command you used for
> your testing?
> 
> Ray


bonnie++ -r 32768 -d /MDraid0 -f -u nobody
Using uid:65534, gid:65533.
Writing intelligently...done
Rewriting...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 1.01d       ------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
dvps2           64G           306229  36 233220  33           607756  43
564.9
 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 29907  95 +++++ +++ 29926  95 29998  93 +++++ +++
27011  92
dvps2,64G,,,306229,36,233220,33,,,607756,43,564.9,0,16,29907,95,+++++,++
+,29926,
95,29998,93,+++++,+++,27011,92

which, in english, means "there is 32 GB of memory, use the directory
/MDraid0, do only fast operations, run as the generic user "nobody".

As a result of "-r 32768" bonnie++ chooses to write 64GB of data, which
you can see in the output.  I just changed the directory name to
describe the configuration, more or less, that was being tested.

HTH

--John