Karanbir Singh wrote:

Adriano Viscarde wrote:

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I have a IBM XSeries 366 with 04 processors Intel Xeon 3.16 Ghz, 16 Gb of memory and a storage IBM with 2 terabytes. I work with virtualization and my OS in this machine is a VMware ESX 2.5.3 version. When I install CentOS 4.X as guest operating system under ESX, the performance is very very bad. When I intsall RHES4 as guest operating system under ESX, the performance is very good. It will be that it has some problem CentOS to work with virtualization?

Can you provide some details on what tests you ran to determine the performance ? even if its just a few simple things, I'd like to know so we can see where the problem might be.

I'm running CentOS on vmware-server, not ESX, and have had no real issues except the time loosing-sync, which is a vmware issue more than a CentOS issue ( and there are a lot of fix's for it hanging around ).

• KB

Hi,

I've had some experience with RHEL4 & ESX 2.5.x

ESX 2.5.x does not really support kernel 2.6 very nicely ....but ESX 3.0 that just came out does it perfectly (or so does VMWare tell me:))

So ....either stay with CentOS3 or upgrade your ESX to 3.0 :O

Laters, Finnur

Karanbir Singh wrote:

Hi Finnur,

thanks for your feedback on ESX 2.5.x and 3.x - While its interesting to note about the linux-2.4.x and linux-2.6.x issue, the main concern I had was something else... ( read below )

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ESX, the performance is very very bad. When I intsall RHES4 as guest operating system under ESX, the performance is very good. It will be that it has some problem CentOS to work with virtualization?

this is the point I am most interested in, what / why is it that RHES4 will work fine and not CentOS4.

• KB

Did you use the driver disks for RHEL4 supplied by VMWare ? (for SCSI drivers)? I think the newest from them is for the stock update 2 kernel ....That is the only reason i can think of ...:(

Later, Finnur

I have CentOS 4.3 running on ESX with no problems. I did run into the issue of the SCSI controller and CentOS would not recognize the hard drives, but I change the drivers (in the CentOS VS) to act as a LSI Logic and not an LSI Bus.