They went on to list some of the use cases that one might want to use an RDM such as a clustering solution like MSCS or when you need to take array snapshots of a single VM. Some additional use cases might be around an application that needs to write SCSI commands directly to a LUN or if you may potentially need to move an application from a VM to a physical server where you can move the LUN. Performance should really never be a valid use case for using an RDM as they also have some disadvantages which include more difficult management and certain vSphere feature restrictions.
Well those older recommendations still apply today and to proof that VMware just published a new white paper that examine SQL Server performance on vSphere 6. The conclusions of this recent testing was:. If performance is not a factor, then what other differences exist between the two such that you may choose one versus the other? Both options offer many of the same features such as file locking, permissions, persistent naming and the ability to leverage vMotion.
The default recommendation for VMware 5. In fact, you should only use RDM for one of the following reasons:. Applications ITSM. By Thomas LaRock. March 26, Database. Which one do you need? VMware has published reports that suggest that, with vSphere 5. If performance is not a factor, then what other differences exist between the two such that you may choose one versus the other?
Essentially, it is a virtual hard drive. Monolithic flat's performance doesn't reduce over time. These disks are safe, don't need consistent monitoring and special maintenance. More often such disks are used when the file system can't cope with large files.
So, if information occupies 8GB it will be represented with four 2GB chunks, having file-s Description is a separate small file with usual. So, it is relatively safe but not fast disk format.
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