Attaching MD's to R900 / Perc6e performance with redundant SAS

Stephan van Hienen stephan.van.hienen at thevalley.nl
Tue Feb 2 12:52:49 CST 2010


On Tue, 19 Jan 2010, Jens_Heinz at Dell.com wrote:
>Of course there should be. Unfortunately I never had a chance to try how
>big the performance gain will be. 
>But maybe someone else here can answer that. 

We received a new R510 with a MD1000 last week, so I did some performance testing.
The R510 has a single E5520 and 16GB memory and running RHEL 5.4.
the MD1000 has 15 SAS 1TB disk.

===raid6===(15disk) 
==with "blockdev --setra 16384" / "mkfs.xfs -d su=64k,sw=13 /dev/sdc1 -f -i size=512"
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
opslag.theva 32088M 88679  99 499080  53 257350  29 79273  99 935860  45 924.7   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 +++++ +++ +++++ +++ 32737  91 24767  97 +++++ +++ 27652  97
opslag.thevalley.local,32088M,88679,99,499080,53,257350,29,79273,99,935860,45,924.7,0,16,+++++,+++,+++++,+++,32737,91,24767,97,+++++,+++,27652,97
=======================

===raid6===(15disk/redundant sas)
==with "blockdev --setra 16384" / "mkfs.xfs -d su=64k,sw=13 /dev/sdc1 -f -i size=512"
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
opslag.theva 32088M 84710  99 493585  58 261930  30 79131  99 1131421  59 923.4   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 +++++ +++ +++++ +++ +++++ +++ 27882  99 +++++ +++ 28744  98
opslag.thevalley.local,32088M,84710,99,493585,58,261930,30,79131,99,1131421,59,923.4,0,16,+++++,+++,+++++,+++,+++++,+++,27882,99,+++++,+++,28744,98
=======================

And also RAID50 and RAID0 benchmarks, but without any performance tweaks. (but all with aligned partition/lvm)
We did this to test if we would go for RAID50 or RAID6

===raid50===(14disk)
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
opslag.theva 32088M 88513  99 651777  65 125296  13 66391  94 432141  16 712.3   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 +++++ +++ +++++ +++ 29574  97 27544  99 +++++ +++ 29659  84
opslag.thevalley.local,32088M,88513,99,651777,65,125296,13,66391,94,432141,16,712.3,0,16,+++++,+++,+++++,+++,29574,97,27544,99,+++++,+++,29659,84
=======================

===raid0===(15disk)
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
opslag.theva 32088M 88257  99 764603  75 111148  10 56477  89 360101  10 704.9   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 31703 100 +++++ +++ 31370  85 24680  99 +++++ +++ 28337  98
opslag.thevalley.local,32088M,88257,99,764603,75,111148,10,56477,89,360101,10,704.9,0,16,31703,100,+++++,+++,31370,85,24680,99,+++++,+++,28337,98
=======================

===raid6===(15disk)
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
opslag.theva 32088M 87491  99 499965  53 94219   8 55982  89 363572  11 690.7   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 +++++ +++ +++++ +++ 31512  55 26047  99 +++++ +++ 28456  41
opslag.thevalley.local,32088M,87491,99,499965,53,94219,8,55982,89,363572,11,690.7,0,16,+++++,+++,+++++,+++,31512,55,26047,99,+++++,+++,28456,41
=======================

Stephan



More information about the Linux-PowerEdge mailing list