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SandyB
Enthusiast
Enthusiast

File Server VMs running on ESX 3.5 using RDMs for the Data volumes, strange CPU behavior

Last weekend we moved our 2 Main File servers from Physical to VMs, we set up a 2 host cluster using Dell PowerEdge 2950s with Dual - Dual-Core Xeons, 16Gb Ram and Qlogic QLE2462 HBAs. The Host are ESX 3.5 Update 2 (Build 110268) will Vmotion, DRS and HA enabled.

The VMs are set with 2vCPU 2048mb RAM the OS is Windows 2003 R2 SP2 32bit, I created a seperate 40Gb VMFS SAN lun for each VM and formatted it as VMFS this holds a 15Gb vmdk for the C: drive. 1 file server holds the user home drives and the other is the departmental file server. The user file server has a 350Gb SAN Lun connected to the VM as an RDM and the departmental file server has a 600Gb and a 300Gb SAN luns again connected as RDMs.

the 2 40Gb VMFS volumes are available to both hosts as are the data volumes. We have tested Vmotion and it works fine.

These are the only 2 VMs currently on the cluster, 1 VM on each host.

The file servers are both performing fine however on the physical servers the CPU usage was a maximum of 5-10% in the VM it fluctuates wildly between 10 and 75% through out the day. does anyone have any ideas why this is? The Disk/Network/Memory stats are all similar to the Physical servers.

thanks

Sandy

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4 Replies
Texiwill
Leadership
Leadership

Hello,

How are you measuring the CPU usage? I use a 270GB RDM for my fileserver with no major issues in performance. Remember you need to use VMware's tools to really measure performance, whether that is esxtop, VIC to Host, or VIC to VC.


Best regards,

Edward L. Haletky

VMware Communities User Moderator

====

Author of the book 'VMWare ESX Server in the Enterprise: Planning and Securing Virtualization Servers', Copyright 2008 Pearson Education.

SearchVMware Blog: http://itknowledgeexchange.techtarget.com/virtualization-pro/

Blue Gears Blogs - http://www.itworld.com/ and http://www.networkworld.com/community/haletky

As well as the Virtualization Wiki at http://www.astroarch.com/wiki/index.php/Virtualization

--
Edward L. Haletky
vExpert XIV: 2009-2023,
VMTN Community Moderator
vSphere Upgrade Saga: https://www.astroarch.com/blogs
GitHub Repo: https://github.com/Texiwill
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SandyB
Enthusiast
Enthusiast

I'm using the performance monitoring from within Virtual Center (2.5 update 2) I have also used Solarwinds VM Monitor.

what values should i be looking for when using ESXtop?

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Texiwill
Leadership
Leadership

Hello,

I would look at %WAIT, %BUSY for the VM in question. The main question is are you seeing any major performance issues? Or just fluctuating CPU?


Best regards,

Edward L. Haletky

VMware Communities User Moderator

====

Author of the book 'VMWare ESX Server in the Enterprise: Planning and Securing Virtualization Servers', Copyright 2008 Pearson Education.

SearchVMware Blog: http://itknowledgeexchange.techtarget.com/virtualization-pro/

Blue Gears Blogs - http://www.itworld.com/ and http://www.networkworld.com/community/haletky

As well as the Virtualization Wiki at http://www.astroarch.com/wiki/index.php/Virtualization

--
Edward L. Haletky
vExpert XIV: 2009-2023,
VMTN Community Moderator
vSphere Upgrade Saga: https://www.astroarch.com/blogs
GitHub Repo: https://github.com/Texiwill
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SandyB
Enthusiast
Enthusiast

Not seeing any performance issues, just the CPU is randomly busy, its just screwing our stats of the before and after virtualising...

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