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Poor Disk I/O Performance in CentOS 5 64-bit Guest...

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Good morning all.

 

I've got an odd disk performance issue in one of my VMware Server VMs that I'm hoping someone can give me some direction on.

 

The host is a Dual Dual-Core Xeon system with 4Gb of RAM, a RAID-5 Array on a 3Ware 9650 Controller, running CentOS 5 64-bit as the host OS with VMware Server 1.03 running two Guest VMs;  One is a Windows 2003 Server and the other is a CentOS 5 64-bit.  The CentOS VM has the virtual drive preallocated and broken up into 2Gb segments, and no snapshots are running.  I've done all the normal tweaks to the .vmx file (sched.mem.pshare.enable = "FALSE", mainMem.useNamedFile = "FALSE", MemTrimRate = "0", etc.).

 

The Windows VM and the Host OS run beautifully...Fast and stable.  The CentOS VM however, functions just fine, but has significant i/o bottlenecks when reading and writing to the virtual drive.  As an example, while the backup is running at night (just the backup agent is running, no other user activity), vmstat shows iowait of 85 to 99, but the bi values are only in the 400 to 900 range.

 

I've set up a number of similar configurations in the past, but this is the first with CentOS 5 in the VM, so I'm wondering if there's some configuration "tweaks" that need to be made for this version?

 

Any and all thoughts on this are welcomed and appreciated.

 

-Phil


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