performance issue

Chris Watkins watkins at hungry.com
Fri Aug 9 20:21:00 CDT 2002


I have seen alot of posts about this but never really found an answer.
I just got a PE1500SC with the perc3 and 5 18 gig drives.
I have 10 luns, 8 of which are 2meg a piece (I have to do this for a system called pick.)
But when I run bonnie++ accross a 20 gig partition I made I am getting what looks like 5mb a sec?
(I turned on read ahead instead of adaptive and turned on cache instead of direct in dellmgr and
it went up to the bonnie readings below..
running 7.2 with the ethernet driver update and 1.17a
512mb of ram, two 1.4ghz processors.
Any suggestions?
And here's one, since I have to have several luns that are 2gig, any gotchas there?
pick is reading those raw though.



hdparm
[root at pickadelly space]# hdparm -t /dev/sdb1

/dev/sdb1:
 Timing buffered disk reads:  64 MB in  4.42 seconds = 14.48 MB/sec
[root at pickadelly space]# hdparm -t /dev/sdb1

/dev/sdb1:
 Timing buffered disk reads:  64 MB in  4.33 seconds = 14.78 MB/sec

bonnie++
[root at pickadelly init.d]# cat /space/bonnietest
Version 1.02b       ------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
pickadelly       1G  8262  45  9292   8  4588   3  6187  33 12875   4 217.1   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  1251  67 +++++ +++ 22693  99  1721  90 +++++ +++  6554  74
pickadelly,1G,8262,45,9292,8,4588,3,6187,33,12875,4,217.1,0,16,1251,67,+++++,+++
,22693,99,1721,90,+++++,+++,6554,74


megaraid: v1.17a (Release Date: Fri Jul 13 18:44:01 EDT 2001)
megaraid: found 0x101e:0x1960:idx 0:bus 0:slot 6:func 0
scsi0 : Found a MegaRAID controller at 0xe0825000, IRQ: 20
megaraid: [1.63:3.17] detected 10 logical drives
megaraid: channel[1] is raid.
scsi0 : AMI MegaRAID 1.63 254 commands 16 targs 1 chans 40 luns
  Vendor: MegaRAID  Model: LD0 RAID5 10000R  Rev: 1.63
  Vendor: MegaRAID  Model: LD1 RAID5 20000R  Rev: 1.63
  Vendor: MegaRAID  Model: LD2 RAID5  2000R  Rev: 1.63
  Vendor: MegaRAID  Model: LD3 RAID5  2000R  Rev: 1.63
  Vendor: MegaRAID  Model: LD4 RAID5  2000R  Rev: 1.63
  Vendor: MegaRAID  Model: LD5 RAID5  2000R  Rev: 1.63
  Vendor: MegaRAID  Model: LD6 RAID5  2000R  Rev: 1.63
  Vendor: MegaRAID  Model: LD7 RAID5  2000R  Rev: 1.63
  Vendor: MegaRAID  Model: LD8 RAID5  2000R  Rev: 1.63
  Vendor: MegaRAID  Model: LD9 RAID5  2000R  Rev: 1.63

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