RE: vmware & Oracle
- From: "Matthew Zito" <mzito@xxxxxxxxxxx>
- To: <Brandon.Allen@xxxxxxxxxxx>, <Sean.oneill@xxxxxxxxxx>, "List, Oracle-l Freelists" <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 19 Jul 2007 14:01:04 -0400
It is a fair point that it adds an extra layer, but they've invested a
huge amount of effort in mitigating that. Also, it matters *what*
VMWare you're running. Both workstation and server run their virtual
machines as processes - so there is a huge userspace jump, and IO is
definitely impacted.
In VMWare ESX server, the OS of the physical machine is a customized
version of Linux with a custom kernel, and the virtual machines have a
much more direct IO path, as well as typically the VMWare filesystem on
the physical machine, as opposed to a standard ext3 filesystem for
vmware workstation, etc.
So, if you look at IO impact statistics from someone, make sure they're
comparing the version of VMWare you'd want to run.
Matt
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Allen, Brandon
Sent: Thursday, July 19, 2007 12:52 PM
To: Sean.oneill@xxxxxxxxxx; List, Oracle-l Freelists
Subject: RE: vmware & Oracle
I have no experience with it, but this comment from the list
archives indicates that vmware slows down I/O by adding an extra layer
between Oracle and the disks:
//www.freelists.org/archives/oracle-l/01-2007/msg00094.html
I'd be curious to see specific numbers from someone running a
fixed set of Oracle I/Os (e.g. a large table scan & a large index range
scan) against the same hardware with and without VMWare. Anyone on the
list done anything like that to get precise timings?
Other related posts:
