Storage

Question 1

What types of storage can you boot from?

Answer 1

iSCSi, Fibre-Channel and FCOE (Local Storage)

Question 2

How many extents can a VMFS5 datastore be made up of?

Answer 2

32 Extents up to 64TB in size

Question 3

How can you change the block size of a VMFS3 datastore when upgrading to VMFS5

Answer 3

You must recreate the datastore

Question 4

Is Storage IO control enabled by default?

Answer 4

No

Question 5

Can datastore types be mixed within a datastore cluster?

Answer 5

No

Question 6

Can storage DRS apply recommendations on Templates?

Answer 6

No

Question 7

What are the ESXi device identifiers?

Answer 7

■ SCSI INQUIRY

eui. 5577bd49251ddb52
naa. 6006016094602800e07ff528b73ae011:2

■ Path-based

mpx. vmhba2:C0:T0:L0
- Legacy

vml. 02000600006006016094602800364ce22e38
25e011524149442030: 1

■ Runtime Name

vmhba1:C0:T1:L0

Question 8

What kind of changes would require rescanning storage devices?

Answer 8

A new disk array is zoned on a SAN.
■ A new device (LUN) is created on a SAN.
■ The path masking on a host is changed.
■ A cable is reconnected.
■ CHAP settings in iSCSI environments are modified.
■ Static or dynamic addresses in iSCSI environments are modified.

Question 9

What are the four VMFS filters?

Answer 9

• *VMFS filter** - config.vpxd.filter.vmfsFilter
• *RDM filter** - config.vpxd.filter.rdmFilter
• *Same Host and Transports filter** - config.vpxd.filter.SameHostAndTransportsFilter
• *Host Rescan filter** - config.vpxd.filter.hostRescanFilter

Question 10

What is a Dependent Hardware iSCSI Adapter

Answer 10

This is an adapter that performs the iSCSI processing
but relies on the VMkernel for networking access.

Question 11

What is a Independent Hardware iSCSI Adapter

Answer 11

This is an adapter that performs both the iSCSI
processing and networking. This adapter is also known as an iSCSI HBA.

Question 12

What is unidirectional CHAP?

Answer 12

The target (storage system) authenticates the iSCSI adapter (initiator);
however the initiator does not authenticate the target.

Question 13

What is bidirectional CHAP?

Answer 13

The target (storage system) authenticates the iSCSI adapter (initiator),
and the initiator also authenticates the target. Mutual CHAP is supported for dependent hardware iSCSI adapters and software iSCSI adapters only.

Question 14

Study the CHAP security levels

Answer 14

Question 15

What must a Network Adapter or HBA have to support boot from SAN?

Answer 15

iBFT (iSCSI Boot Firmware Table).

Question 16

What must an array support to be able to use array thin provisioning? (vSphere 5 and up)

Answer 16

T10-based Storage APIs: Array Integration

Question 17

What are the requirements for unmounting a datastore?

Answer 17

■ Virtual machines and templates may not reside on the datastore.
■ ISOs located on the datastore must be removed from virtual machines.
■ Mapping files for RDMs on the datastore must be removed.
■ The datastore cannot be part of a datastore cluster.
■ The datastore must not be managed by Storage DRS.
■ Storage I/O Control must be disabled for the datastore.
■ The datastore must not be used for vSphere HA heartbeat.
■ No operations, including those from scripts or third-party utilities, that would result in
I/O to the datastore can be used while the unmount operation is in progress.

Question 18

What is the PSA? MPP? NMP?

Answer 18

Pluggable Storage Architecture, Multipathing Plug-in, Native Multipathing Plugin

Question 19

What are the two additional NMP’s?

Answer 19

Storage Array Type Plug-in (SATP)

Path Selection Plug-in (PSP)

Question 20

What are the three vmware path selection policies?

Answer 20

Active (active-active)

Most recently used (active-passive)

Round-robin (both)