What are two reasons why a local flash device would be unavailable for use with Virtual SAN? (Choose two.)
A. It has a VMFS datastore present.
B. It is in use by the vFlash Read Cache feature.
C. It is smaller than the minimum capacity required for Virtual SAN usage.
D. It does not have any partitions created.
Correct Answer: AB
Explanation/Reference:
Explanation:
Local Flash Devices Are Unavailable for Use with Virtual SAN or Virtual Flash
A local flash device becomes unavailable for virtual flash resource or Virtual SAN configuration when it is formatted with VMFS or any other file system.
Problem
When you attempt to configure either Virtual SAN or virtual flash resource, a local flash disk does not appear on the list of disks to be used.
Cause
This problem might occur when a local flash intended for use with either feature has been already formatted with VMFS. Neither Virtual SAN nor virtual flash can share the flash disk with VMFS or any other file system.
Also, because virtual flash and Virtual SAN are mutually exclusive consumers of flash disks, both features cannot share the same flash disk. If the flash disk is already claimed by one feature, for example Virtual SAN, you are not be able to use it for another, such as virtual flash, unless you release the disk.
Solution
Use only unformatted flash disks for virtual flash resource and Virtual SAN configuration.
• Avoid formatting the flash disks with VMFS during ESXi installation or Auto Deploy.
• If the flash disk is already formatted with VMFS, remove the VMFS datastore. For information see the vSphere Storage documentation.
• To use the flash disk as a virtual flash resource, do not claim this disk for Virtual SAN. If the disk is claimed by Virtual SAN, remove the disk from Virtual SAN. The flash disk is released from Virtual SAN and becomes available on the list of disks to use with virtual flash. For information about removing disks from Virtual SAN, see the Administering VMware Virtual SAN documentation.
• If you intend to use the flash disk with Virtual SAN, do not use the disk for a virtual flash resource. If the flash disk is used as the virtual flash resource, remove the virtual flash configuration. The disk becomes available for Virtual SAN. See the vSphere Storage documentation.
Reference: https://pubs.vmware.com/vsphere-60/index.jsp?topic=%2Fcom.vmware.vsphere.troubleshooting.doc%2FGUID-A17F5D39-C1F3-47B1-96455C247412F370.html
Explanation/Reference:
Explanation:
Local Flash Devices Are Unavailable for Use with Virtual SAN or Virtual Flash
A local flash device becomes unavailable for virtual flash resource or Virtual SAN configuration when it is formatted with VMFS or any other file system.
Problem
When you attempt to configure either Virtual SAN or virtual flash resource, a local flash disk does not appear on the list of disks to be used.
Cause
This problem might occur when a local flash intended for use with either feature has been already formatted with VMFS. Neither Virtual SAN nor virtual flash can share the flash disk with VMFS or any other file system.
Also, because virtual flash and Virtual SAN are mutually exclusive consumers of flash disks, both features cannot share the same flash disk. If the flash disk is already claimed by one feature, for example Virtual SAN, you are not be able to use it for another, such as virtual flash, unless you release the disk.
Solution
Use only unformatted flash disks for virtual flash resource and Virtual SAN configuration.
• Avoid formatting the flash disks with VMFS during ESXi installation or Auto Deploy.
• If the flash disk is already formatted with VMFS, remove the VMFS datastore. For information see the vSphere Storage documentation.
• To use the flash disk as a virtual flash resource, do not claim this disk for Virtual SAN. If the disk is claimed by Virtual SAN, remove the disk from Virtual SAN. The flash disk is released from Virtual SAN and becomes available on the list of disks to use with virtual flash. For information about removing disks from Virtual SAN, see the Administering VMware Virtual SAN documentation.
• If you intend to use the flash disk with Virtual SAN, do not use the disk for a virtual flash resource. If the flash disk is used as the virtual flash resource, remove the virtual flash configuration. The disk becomes available for Virtual SAN. See the vSphere Storage documentation.
Reference: https://pubs.vmware.com/vsphere-60/index.jsp?topic=%2Fcom.vmware.vsphere.troubleshooting.doc%2FGUID-A17F5D39-C1F3-47B1-96455C247412F370.html
