RE: Oracle on windows 2003 on vmware

We looked into Oracle on VMware and came to the conclusion that it wasn't a good idea for performance reasons. VMware adds an additional and slow IO layer between oracle and the platters: VMware -> OS -> LVM
-> Disk. As a result, IO performance is not good. We do use this setup
for development and test databases where performance is not important.  

HIH,   Todd

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Allen, Brandon Sent: Wednesday, January 03, 2007 2:43 PM To: RROGERS_at_galottery.org; oracle-l_at_freelists.org Subject: RE: Oracle on windows 2003 on vmware  

Not sure about that - never ran Oracle on vmware before, but I wouldn't think it should require anything special. It sounds like the I/O to your SAN is just slower than the I/O to the internal disks, but you should run a 10046 trace (with waits) on both environments to confirm if that's really where the bottleneck is. Verify that both queries are using exactly the same explain plan first and then check the wait times for the db file scattered reads and also your average read times in v$filestat and/or statspack/AWR.  

You could also just bypass the database and check the I/O speed at the OS levels, e.g. by seeing how long it takes to copy a 500MB file or something like that.  

Regards,

Brandon

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