Term
| What type of storage is VMFS deployed on? |
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Definition
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Term
| What version of VMFS is compatible with vSphere 5? |
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Definition
| Only VMFS 5 is read/writable by only ESXi 5 hosts, however ESXi 5 hosts can read and write to datastores with VMFS 3 as well. |
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Term
| Which file system was built to be optimized for storing virtual machines? |
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Definition
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Term
| T/F: VMFS has the ability to increase the size of a VMFS datastore whilst VMs are running on it |
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Definition
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Term
| T/F: VMFS can store other files besides virtual machine files |
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Definition
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Term
| How does locking work in VMFS? |
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Definition
| VMFS provides specific locking mechanisms (on disk locking) that allow multiple hosts to access the VMs on a shared storage environment. The locking mechanism prevents multiple hosts from concurrently writing or updating metadata. |
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Term
| Explain the concept of metadata as it relates to VMFS |
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Definition
| VMFS Contains metadata which includes all mapping information for files on the datastore. This mapping information or metadata is updated each time you perform either a datastore or virtual machine management option such as creating or growing a virtual disk, powering a VM on or off, creating a template, etc. |
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Term
| What are the two types of locking mechanisms present in VMFS? |
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Definition
1. SCSI reservations (which locks the entire LUN from other hosts), used with storate devices that do not support hardware acceleration
2. Atomic Test and SET (ATS) - (locks per disk sector) for those devices that do support hardware acceleration |
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Term
| What dictates the file system for NFS? |
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Definition
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Term
| How does NFS datastore work with vSphere? |
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Definition
| Uses an NFS volume on a NAS device and allows you to mount it as a datastore |
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Term
| What is the limit imposed by ESXi on NFS datastore size? |
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Definition
| No limit imposed by ESXi. The maximim size of an NFS datastore depends on the maximum size supported by the NFS server. |
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Term
| T/F: NFS can be used to store files other than virtual machines |
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Definition
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Term
| T/F: advanced features such as vMotion, HA, ISO images and Snapshots are not supported with NFS |
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Definition
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Term
| HOw many VMFS 5 datastores can be attached to a host? |
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Definition
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Term
| What is the maximum size of each VMFS 5 datastore? |
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Definition
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Term
| T/F: VMFS 5 extents can be greater than 2TB in size |
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Definition
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Term
| T/F: VMFS 5 supports greater than 2 TB when using physical mode RDMs |
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Definition
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Term
| What is the default locking mechanism for VMFS 5? |
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Definition
| Atomic test and set (ATS) locking on storage devices that support hardware acceleration is now the default locking mechanism |
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Term
| T/F: VMFS 5 can reclaim physical storage space on thin provisioned storage devices |
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Definition
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Term
| T/F: Online upgrades of datastores result in service disruption with VMFS 5 |
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Definition
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