bsohn
Contributor
Contributor

Multiple virtual SCSI Controller Benefits?

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Is there any benefit to using multiple SCSI controllers on a guest?  Thanks.  

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BilBens
Enthusiast
Enthusiast

VMware highly recommends using multiple virtual SCSI controllers for the database virtual machines or
virtual machines with high I/O load. The use of multiple virtual SCSI controllers allows the execution of
several parallel I/O operations inside the guest operating system.

For more info (Page 18)

http://www.vmware.com/files/pdf/partners/oracle/Oracle_Databases_on_VMware_-_Best_Practices_Guide.pd...

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BilBens
Enthusiast
Enthusiast

VMware highly recommends using multiple virtual SCSI controllers for the database virtual machines or
virtual machines with high I/O load. The use of multiple virtual SCSI controllers allows the execution of
several parallel I/O operations inside the guest operating system.

For more info (Page 18)

http://www.vmware.com/files/pdf/partners/oracle/Oracle_Databases_on_VMware_-_Best_Practices_Guide.pd...

------------

Bil Bens

Please consider the use of the Helpful or correct buttons to award points to those Answers you found useful or correct.

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bsohn
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Contributor

Great, thanks!

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jrmunday
Commander
Commander

You are limited to 4, and I would certainly make use of multiple controllers - MS-SQL is a great case for this. Depending on guest OS, use the PV SCSI controller for performance if you can.

I have actually spent the last couple of weeks benchmarking different tiers of storage, and in most cases I saw the best performance when using multiple LUN's (especially as you scale the load out). So this, in combination with additional controllers will give you a good start to setup your own iometer access specifications for testing - just make sure your disks are aligned as this makes a huge difference to performance.

Cheers,

Jon

vExpert 2014 - 2018 | VCP6-DCV | http://www.jonmunday.net | @JonMunday77
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