RE: vmware & Oracle

There is now bug fixes for time issues with vmware, clocks running away with themselves.

I have heard from people running VMWare that it performs better where Linux is the host OS. I am still loathe to recommend it for production environments as it hasn't scaled all that well in the past,number of users accessing, have seen slow IO before and the big one is if you have an application that can get either CPU or IO intensive on its own system how is it to cope with other VM's sharing those resources on the same physical hardware. An unruly application somewhere is in the cluster of VM's on that physical host can severly impact your VM.

I guess whilst it seems to make sense the consolidation idea, it also reduces redundancy, Assume email, fileserving and accouting database are on a single physical host, then if that physical host fails I now have three key systems for my business offline, explain that one to the CEO for a few thousnad dollars saved in hardware

My 0.02c

Peter

-----Original Message-----
From: QuijadaReina, Julio C [mailto:QuijadJC_at_alfredstate.edu] Sent: Friday, 20 July 2007 10:50 AM
To: Sean.oneill_at_organon.ie; List, Oracle-l Freelists Subject: RE: vmware & Oracle

Sean,  

I used to have a Linux VM as a node on development RAC enviroment. On a regular basis - about twice a week - the node was evicted, fenced which would panic the kernel and cause a reboot. I did not dig to deep on the cause - I took the VM out of the cluster. But as far as I remember the reason was that the guest OS (RedHat 4) would continually miss the VM host's clock ticks. That really messed up the time on the guest - making it lag behind up to 3 hours every week. I did not have this problem with the other 2 physical nodes in the cluster.  

Julio

From: oracle-l-bounce_at_freelists.org on behalf of O'Neill, S. (Sean) Sent: Thu 7/19/2007 9:18 AM
To: List, Oracle-l Freelists
Subject: vmware & Oracle

Hi Folks,

Has anyone had much experience (good or bad) with running their Oracle DB's on the "vmware" product from VMware Inc. Speaking to local re-sellers there appears to be a division of opinon as to whether or not there are performance hits when doing so. We've a mixed bag of Oracle versions (8.1.7 to 10.1.0.4), underpinning various applications on our site all running on Windows Server 2000 or 2003. Any feedback, pointers, or links to useful papers would be appreciated, though I'm really interested in "real life" experiences with the product.

Regards,
Seán O'Neill,

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