Re: Disk tests for a new database server

Rory,

While I don't have my specific stats with my from my tests with XFS and
bonnie for our company's db server, I do recall vividly that seq. output
did not increase dramatically until I had 8+ discs in a RAID10
configuration on an LSI card. I was not using LVM. If I had less than 8
discs, seq. output was about equal regardless of file system being uses
(EXT3,JFS,or XFS).

Steve

On Thu, 2005-12-08 at 12:12 +0000, Rory Campbell-Lange wrote:
> We are testing disk I/O on our new server (referred to in my recent
> questions about LVM and XFS on this list) and have run bonnie++ on the
> xfs partition destined for postgres; results noted below.
>
> I haven't been able to find many benchmarks showing desirable IO stats.
> As far as I can tell the sequential input (around 110000K/sec) looks
> good while the sequential output (around 50000K/sec) looks fairly
> average.
>
> Advice and comments gratefully received.
> Suggested Parameters for running pg_bench would be great!
>
> Thanks,
> Rory
>
> The server has a dual core AMD Opteron 270 chip (2000MHz), 6GB of RAM
> and an LSI 320-1 card running 4x147GB disks running in a RAID10
> configuration. The server has a freshly compiled 2.6.14.3 linux kernel.
>
> partial df output:
> Filesystem Size Used Avail Use% Mounted on
> ...
> /dev/mapper/masvg-masdata
> 99G 33M 94G 1% /masdata
> /dev/mapper/masvg-postgres
> 40G 92M 40G 1% /postgres
>
> partial fstab config:
> ...
> /dev/mapper/masvg-masdata /masdata ext3 defaults 0 2
> /dev/mapper/masvg-postgres /postgres xfs defaults 0 2
>
>
> 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
> mas 13000M 52655 99 52951 10 32246 7 41441 72 113438 12 590.0 0
> mas 13000M 49306 83 51967 9 32269 7 42442 70 115427 12 590.5 1
> mas 13000M 53449 89 51982 10 32625 7 42819 71 111829 11 638.3 0
> mas 13000M 51818 88 51639 9 33127 7 42377 70 108585 11 556.5 0
> mas 13000M 48930 90 51750 9 32854 7 41220 71 109813 11 566.2 0
> mas 13000M 52148 88 47393 9 35343 7 42871 70 109775 12 582.0 0
> mas 13000M 52427 88 53040 10 32315 7 42813 71 112045 12 596.7 0
> mas 13000M 51967 87 54004 10 30429 7 46180 76 110973 11 625.1 0
> mas 13000M 48690 89 46416 9 35678 7 41429 72 111612 11 627.2 0
> mas 13000M 52641 88 52807 10 31115 7 43476 72 110694 11 568.2 0
> mas 13000M 52186 88 47385 9 35341 7 42959 72 110963 11 558.7 0
> mas 13000M 52092 87 53111 10 32135 7 42636 69 110560 11 562.0 1
> mas 13000M 49445 90 47378 9 34410 7 41191 72 110736 11 610.3 0
> mas 13000M 51704 88 47699 9 35436 7 42413 69 110446 11 612.0 0
> mas 13000M 52434 88 53331 10 32479 7 43229 71 109385 11 620.6 0
> mas 13000M 52074 89 53291 10 32095 7 43593 72 109541 11 628.0 0
> mas 13000M 48084 88 52624 10 32301 7 40975 72 110548 11 594.0 0
> mas 13000M 53019 90 52441 10 32411 7 42574 68 111321 11 578.0 0
> ------Sequential Create------ --------Random Create--------
> -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
> files:max:min /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
> mas 16 7970 36 +++++ +++ 7534 34 7918 36 +++++ +++ 4482 22
> mas 16 7945 33 +++++ +++ 7483 30 7918 42 +++++ +++ 4438 20
> mas 16 8481 48 +++++ +++ 7468 31 7870 39 +++++ +++ 4385 23
> mas 16 7915 36 +++++ +++ 7498 33 7930 41 +++++ +++ 4619 23
> mas 16 8553 35 +++++ +++ 8312 38 8613 37 +++++ +++ 4513 24
> mas 16 8498 40 +++++ +++ 8215 33 8570 43 +++++ +++ 4858 26
> mas 16 7892 39 +++++ +++ 7624 30 5341 28 +++++ +++ 4762 22
> mas 16 5408 27 +++++ +++ 9378 37 8573 41 +++++ +++ 4385 21
> mas 16 5063 27 +++++ +++ 8656 38 5159 27 +++++ +++ 4705 24
> mas 16 4917 25 +++++ +++ 8682 39 5282 28 +++++ +++ 4723 22
> mas 16 5027 28 +++++ +++ 8538 36 5173 29 +++++ +++ 4719 23
> mas 16 5449 27 +++++ +++ 8630 36 5266 28 +++++ +++ 5463 27
> mas 16 5373 27 +++++ +++ 8658 37 5264 26 +++++ +++ 4731 22
> mas 16 4959 24 +++++ +++ 9126 46 5160 26 +++++ +++ 4717 24
> mas 16 5379 27 +++++ +++ 8620 40 5014 27 +++++ +++ 4701 21
> mas 16 5312 29 +++++ +++ 8642 36 7862 42 +++++ +++ 4869 24
> mas 16 5057 26 +++++ +++ 8566 36 5120 28 +++++ +++ 4681 21
> mas 16 5225 27 +++++ +++ 8740 37 5205 28 +++++ +++ 4744 21
>
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