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Re: bored and setting up a 3/4tb array at the office.



On Wed, 9 Apr 2003, Lennart Sorensen wrote:

> On Tue, Apr 08, 2003 at 07:31:16PM -0400, Mike Dresser wrote:
> >
> > 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
> > mike             1G 25926  89 113641  36 29163   7 30287  96 49783   4 507.5   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  2830  91 +++++ +++ +++++ +++  3093  99 +++++ +++ 9060 100
> > mike,1G,25926,89,113641,36,29163,7,30287,96,49783,4,507.5,0,16,2830,91,+++++,+++,+++++,+++,3093,99,+++++,+++,9060,100
> >
> > /dev/sda:
> >  Timing buffer-cache reads:   128 MB in  0.34 seconds =376.47 MB/sec
>
> Yep a P4 has good memory IO.
>
> >  Timing buffered disk reads:  64 MB in  1.43 seconds = 44.76 MB/sec
>
> I have seen better speeds on single disks than that.  That card should
> be able to pull off much better numbers than that, although perhaps with
> those slow poke drives it can't.

Much better values under raid5, somewhere in the 70's on hdparm.

Here's the Raid5 values:

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
mike             1G 18574  64 20326   6  9319   2 28163  89 94607   8 381.1   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  2643  84 +++++ +++ +++++ +++  3178  98 +++++ +++ 9712  90
mike,1G,18574,64,20326,6,9319,2,28163,89,94607,8,381.1,0,16,2643,84,+++++,+++,+++++,+++,3178,98,+++++,+++,9712,90


Basically goes from a super fast writer, to a super fast reader.  Kind of
expected that, actually.

Mike



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