We tried to use 3ware-ata raid. I did some benchmark with bonnie++.
I found under redhat AS2.1, hardware raid's performance is really bad.
Here is my data:
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
pluto 4G 15846 57 6755 2 4720 1 20656 77 35165 9 286.3
0
------Sequential Create------ --------Random
Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delet
e--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec
%CP
16 4497 99 +++++ +++ +++++ +++ 4549 99 +++++ +++ 10979
100
You can see we only got 6755K/sec for sequential write here.
But use the same machine, same raid setup and run redhat8.0, I got much
better performance.
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
pluto 4G 22472 79 30003 9 9250 9 26189 88 126343 29 287.5
1
------Sequential Create------ --------Random
Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delet
e--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec
%CP
16 4135 99 +++++ +++ +++++ +++ 4324 100 +++++ +++ 10873
99
You can see we got 30003/sec for sequential write, alomost 5 times faster.
That's why I think the default kernel for redhat advanced server is really
old.
Donghui
----- Original Message -----
From: "Roger" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, March 28, 2003 4:40 PM
Subject: Re: redhat advanced server with kernel 2.4.18?
> As you are running Oracle you should run the kernel that comes with Red
> Hat Advanced Server, as this has added functionality specifically for
> Oracle systems. I wouldn't be suprised if Oracle won't provide support
> for anyone who compiles a different kernel as this would not has gone
> through the extensive testing and certification that default kernel has.
>
> Red Hat has also ported some features from newer kernels into the AS2.1
> kernel, so the version number itself is not a true indication of how 'old'
> it is.
>
>
> On Fri, 28 Mar 2003, Donghui Wen wrote:
>
> > We bought a redhat advanced server 2.1 with a default kernel
2.4.9-e3.
> > It is pretty old. So I want to upgrade to a new kernel. But I can only
> > download
> > the binary RPM of kernel-2.4.9.e16 from redhat networks. It seems
2.4.9.e16
> > is the highest kernel version redhat advanced server supports.
> > However, I saw there is a kernel-2.4.18 source rpm for advanced
server
> > on
> > redhat's ftp server. I tried to compile it. It reported error when
patching
> > the
> > default kernel source. So my question is: What is the highest kernel
version
> > redhat advanced server supports? 2.4.9 or 2.4.18? I can just change the
> > rpm's source
> > spec to make kernel-2.4.18 got compiled. But we are using AS2.1 in
> > production enviroment which runs oracle. We want to use a highest
version
> > redhat and oracle certified.
> >
>
>
>
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