PE 1800 PERC4/SC write performance

David Hubbard dhubbard at dino.hostasaurus.com
Sat Apr 29 15:39:12 CDT 2006


On RHEL 4 I've found I will generally get a noticable 
performance gain by running:

/sbin/blockdev --setra 16384 /dev/sda

or whatever your PERC logical drive(s) show up as.

The optimal value can differ based on what you're doing,
here's a script someone wrote that will cycle through
multiple values while testing inbetween:

http://www.redhat.com/archives/linux-lvm/2005-April/msg00083.html

David

> -----Original Message-----
> From: Matthew DeJong [mailto:mdejong at dejonginc.com] 
> Sent: Saturday, April 29, 2006 4:34 PM
> To: David Hubbard; linux-poweredge at dell.com
> Subject: RE: PE 1800 PERC4/SC write performance
> 
> Sorry, The subject started with a discussion of RHEL 4.  I am 
> using the
> 2.6.9-22ELsmp Kernel.
> 
> -----Original Message-----
> From: David Hubbard [mailto:dhubbard at dino.hostasaurus.com] 
> Sent: Saturday, April 29, 2006 4:30 PM
> To: Matthew DeJong; linux-poweredge at dell.com
> Subject: RE: PE 1800 PERC4/SC write performance
> 
> Which version of linux is this?
> 
> David 
> 
> > -----Original Message-----
> > From: linux-poweredge-bounces at dell.com 
> > [mailto:linux-poweredge-bounces at dell.com] On Behalf Of 
> Matthew DeJong
> > Sent: Saturday, April 29, 2006 4:20 PM
> > To: linux-poweredge at dell.com
> > Subject: PE 1800 PERC4/SC write performance
> > 
> > Here is the apples to apples comparison.  Overall it is 
> fairly similar
> 
> > to your results.  It seems like the speed is dropping off severely 
> > when it reaches the 2GB test. Anyway, I first noticed the issue 
> > because I am running Vmware GSX 3.2 and logs for the 
> Virtual machine 
> > files show RW times in the 20-30 seconds for a command that will 
> > read/write less than 10 KB at random times.  Vmware support was 
> > pointing the finger at the RW tests that I was performing.  
> Anyway, I 
> > am going to check into the hard drive type when I get back into the 
> > office.
> > 
> > Iozone took a little over 40 minuets to complete.
> > 	Iozone: Performance Test of File I/O
> > 	        Version $Revision: 3.263 $
> > 		Compiled for 32 bit mode.
> > 		Build: linux
> > 
> > 	Contributors:William Norcott, Don Capps, Isom Crawford, Kirby
> Collins
> > 	             Al Slater, Scott Rhine, Mike Wisner, Ken Goss
> > 	             Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain
> CYR,
> > 	             Randy Dunlap, Mark Montague, Dan Million, 
> > 	             Jean-Marc Zucconi, Jeff Blomberg,
> > 	             Erik Habbinga, Kris Strecker, Walter Wong.
> > 
> > 	Run began: Sat Apr 29 14:56:59 2006
> > 
> > 	Using minimum file size of 524288 kilobytes.
> > 	Using maximum file size of 2097152 kilobytes.
> > 	Auto Mode
> > 	Cross over of record size disabled.
> > 	Command line used: ./iozone -n 512m -g 2g -f test.out -az -i0
> > -i1
> > 	Output is in Kbytes/sec
> > 	Time Resolution = 0.000001 seconds.
> > 	Processor cache size set to 1024 Kbytes.
> > 	Processor cache line size set to 32 bytes.
> > 	File stride size set to 17 * record size.
> >                                                             random
> > random    bkwd  record  stride                                   
> >               KB  reclen   write rewrite    read    reread    read
> > write    read rewrite    read   fwrite frewrite   fread  freread
> >           524288       4  264576  646898  1492711  1520397
> > 
> >           524288       8  289154  660507  1666374  1726942
> > 
> >           524288      16  300149  699894  1944507  1966867
> > 
> >           524288      32  293641  718210  1966749  2045977
> > 
> >           524288      64  301815  741746  2090454  2138832
> > 
> >           524288     128  311868  746704  2011726  2168424
> > 
> >           524288     256  312476  761608  2099351  2190201
> > 
> >           524288     512  312461  722570  1965237  2144274
> > 
> >           524288    1024  299916  692823  1381126  1399889
> > 
> >           524288    2048  285049  637515   994801  1001033
> > 
> >           524288    4096  289618  633259   966112   990276
> > 
> >           524288    8192  289300  607463   979552   987008
> > 
> >           524288   16384  280119  620299   973899   981694
> > 
> >          1048576       4  272353  590367  1530602  1556665
> > 
> >          1048576       8  283272  627307  1776928  1806307
> > 
> >          1048576      16  296379  692436  1953259  1984207
> > 
> >          1048576      32  296698  711043  1972242  2103703
> > 
> >          1048576      64  305873  737602  2131424  1981623
> > 
> >          1048576     128  307436  715663  2157777  2079245
> > 
> >          1048576     256  304777  718732  2179515  2101338
> > 
> >          1048576     512  306837  717351  2124950  2187532
> > 
> >          1048576    1024  298214  680887  1380384  1410346
> > 
> >          1048576    2048  284437  601957   994461   999087
> > 
> >          1048576    4096  283793  571339   989065   976472
> > 
> >          1048576    8192  284072  619312   972332   977893
> > 
> >          1048576   16384  285387  624100   982137   985205
> > 
> >          2097152       4  121151   56360  1493933  1526728
> > 
> >          2097152       8   60361   53859  1791923  1809696
> > 
> >          2097152      16   57554   54448  1967721  1984402
> > 
> >          2097152      32   55437   58195  2034229  2061926
> > 
> >          2097152      64   57202   54906  1956913  2154958
> > 
> >          2097152     128   56152   54857  2020309  2183998
> > 
> >          2097152     256   55288  129611  2178671  2199473
> > 
> >          2097152     512   56186   54165  2118198  2136020
> > 
> >          2097152    1024   57717   53757  1412365  1424924
> > 
> >          2097152    2048   58967   57279   974913   983324
> > 
> >          2097152    4096   59840   53600   927708   990505
> > 
> >          2097152    8192   58139   55658   909564   928544
> > 
> >          2097152   16384   57764   57490   984673   988934
> > 
> > 
> > iozone test complete.
> > 
> > ----A smaller random ~ 15 minutes
> > 	Iozone: Performance Test of File I/O
> > 	        Version $Revision: 3.263 $
> > 		Compiled for 32 bit mode.
> > 		Build: linux
> > 
> > 	Contributors:William Norcott, Don Capps, Isom Crawford, Kirby
> Collins
> > 	             Al Slater, Scott Rhine, Mike Wisner, Ken Goss
> > 	             Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain
> CYR,
> > 	             Randy Dunlap, Mark Montague, Dan Million, 
> > 	             Jean-Marc Zucconi, Jeff Blomberg,
> > 	             Erik Habbinga, Kris Strecker, Walter Wong.
> > 
> > 	Run began: Sat Apr 29 16:00:31 2006
> > 
> > 	Using minimum file size of 131072 kilobytes.
> > 	Using maximum file size of 533504 kilobytes.
> > 	Auto Mode
> > 	Cross over of record size disabled.
> > 	Command line used: ./iozone -n 128m -g 521m -f test.out -az -i0
> > -i2
> > 	Output is in Kbytes/sec
> > 	Time Resolution = 0.000001 seconds.
> > 	Processor cache size set to 1024 Kbytes.
> > 	Processor cache line size set to 32 bytes.
> > 	File stride size set to 17 * record size.
> >                                                             random
> > random    bkwd  record  stride                                   
> >               KB  reclen   write rewrite    read    reread    read
> > write    read rewrite    read   fwrite frewrite   fread  freread
> >           131072       4  279149  627087                   1055832
> > 577208                                                          
> >           131072       8  288892  695563                   1351857
> > 693513                                                          
> >           131072      16  300793  728493                   1540861
> > 716471                                                          
> >           131072      32  305741  707644                   1741082
> > 785336                                                          
> >           131072      64  308080  763982                   2002203
> > 824066                                                          
> >           131072     128  314768  730364                   1888673
> > 814587                                                          
> >           131072     256  308758  771492                   2073632
> > 840414                                                          
> >           131072     512  314056  765603                   1907860
> > 801193                                                          
> >           131072    1024  296494  670140                   1159693
> > 716960                                                          
> >           131072    2048  277440  646496                    994460
> > 690426                                                          
> >           131072    4096  272366  636704                    920591
> > 673774                                                          
> >           131072    8192  291080  637776                    896948
> > 660871                                                          
> >           131072   16384  286874  626739                    955432
> > 681155                                                          
> >           262144       4  276603  630402                   1106498
> > 608277                                                          
> >           262144       8  274610  708193                   1317684
> > 692160                                                          
> >           262144      16  299394  733024                   1643691
> > 769536                                                          
> >           262144      32  290253  713229                   1781739
> > 779167                                                          
> >           262144      64  313339  764446                   1872939
> > 788564                                                          
> >           262144     128  315516  768987                   2092230
> > 850660                                                          
> >           262144     256  294805  776161                   2106742
> > 855449                                                          
> >           262144     512  310725  769592                   1912470
> > 799531                                                          
> >           262144    1024  289723  670357                   1265192
> > 748884                                                          
> >           262144    2048  289237  640655                    998427
> > 694126                                                          
> >           262144    4096  288655  636611                    972589
> > 686111                                                          
> >           262144    8192  287359  643214                    922766
> > 686913                                                          
> >           262144   16384  291624  614833                    904602
> > 665210                                                          
> >           524288       4  271036  646172                   1051418
> > 602537                                                          
> >           524288       8  276982  666030                   1327311
> > 690155                                                          
> >           524288      16  289833  712515                   1681396
> > 768319                                                          
> >           524288      32  303513  734785                   1867255
> > 801716                                                          
> >           524288      64  308737  746312                   2008466
> > 838387                                                          
> >           524288     128  311911  742613                   2093008
> > 852194                                                          
> >           524288     256  312538  723363                   2119063
> > 858618                                                          
> >           524288     512  304606  716176                   2024254
> > 851557                                                          
> >           524288    1024  288327  680702                   1313853
> > 752823                                                          
> >           524288    2048  290180  608996                    984547
> > 687097                                                          
> >           524288    4096  289745  614119                    930884
> > 682693                                                          
> >           524288    8192  289700  618890                    928454
> > 678414                                                          
> >           524288   16384  284951  632242                    961114
> > 689191                                                          
> > 
> > iozone test complete.
> > 
> > Matt DeJong
> > 
> > _______________________________________________
> > Linux-PowerEdge mailing list
> > Linux-PowerEdge at dell.com
> > http://lists.us.dell.com/mailman/listinfo/linux-poweredge
> > Please read the FAQ at http://lists.us.dell.com/faq
> > 
> > 
> 
> 



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