The difference between crash consistent and application consistent cloning methods is that the application consistent method ensures that the cloned virtual machine is in a consistent state with respect to the application and database, while the crash consistent method does not guarantee that1. The application consistent method uses the VMware snapshot or the Microsoft Volume Shadow Copy Service (VSS) to quiesce the application and flush the pending I/O operations to the disk before creating the clone, which prevents data corruption or loss2. The crash consistent method does not quiesce the application or flush the pending I/O operations, and creates the clone as if the virtual machine had crashed, which may result in data inconsistency or recovery issues3. The application consistent method is recommended for virtual machines that run database applications, such as SQL Server or Oracle, while the crash consistent method is suitable for virtual machines that run non-database applications, such as web servers or file servers4. The application consistent method is not available only for Linux operating systems (option D), as it also supports Windows Server operating systems that have VMware Tools or VSS installed5. The crash consistent method should not be used only for the virtual machines with Fault Tolerance enabled (option C), as it can be used for any virtual machine that does not require application consistency. Both methods are not the same,and the speed of cloning is not the only difference (option B), as they have different implications for the data integrity and availability of the cloned virtual machine. References:
1: Using HPE SimpliVity Official Certification Study Guide (HPE2-K45), HPE Press, 2019, p. 28.
2: Clone a virtual machine - techhub.hpe.com, HPE, 2021, 3.
3: HPE SimpliVity OmniStack Interoperability Guide 4.2.0, HPE, 2021, p. 8.
4: Using HPE SimpliVity Official Certification Study Guide (HPE2-K45), HPE Press, 2019, p. 29.
5: HPE SimpliVity OmniStack Interoperability Guide 4.2.0, HPE, 2021, p. 9.
[6]: Using HPE SimpliVity Official Certification Study Guide (HPE2-K45), HPE Press, 2019, p. 28.
[7]: Clone a virtual machine - techhub.hpe.com, HPE, 2021, 3.