O&S Module 7: Flash Cards

Which of the following are path selection policies used in SAN configuration?

Optional third-party path selection policy Most recently used Fixed Round robin

Path Selection Plug-in: Handles path selection for a SCSI storage device

PSP

Path Selection Scheme: Handles multipathing for NVMe storage devices

PSS

What is PSA, in the context of vSphere storage?

Pluggable Storage Architecture is an open and modular framework that coordinates various software modules responsible for multipathing operations.

What does iSER stand for?

iSCSI Extension for RDMA

Where does data exchange occur when using NVMe over RDMA (RoCE v2)?

In the main memory.

Identify the disk latency metrics. Tracks the latencies due to the ESXi VMkernel commands.

KAVG

What do you enter to display disk throughput by storage adapter?

'd'

What is the maximum number of paths you can configure for NVMe-oF?

128

Which of the following is the performance metric that measures the number of active commands: I/O operations currently active?

ACTV

Identify following iSER configuration steps to their descriptions. With the dynamic discovery, each time the initiator contacts a specified iSER storage system, it sends the SendTargets request to the system. With static discovery, manually enter information for the targets.

Configure dynamic or static discovery for iSCSI and iSER.

Which of the following are best practices that should be followed to get the best performance from storage?

Configure each LUN with the storage characteristics for applications and VMs that use the LUN. Eliminate all possible swapping to reduce the burden on the storage subsystem. Postpone major storage maintenance until off-peak hours. Isolate iSCSI and NFS traffic.

Identify following iSER configuration steps to their descriptions. You must create network connections to bind the iSER engine and the RDMA-capable network adapter.

Configure port binding for iSCSI or iSER.

Identify the disk latency metrics. The latency seen at the device driver level. It includes the round-trip time between the HBA and the storage.

DAVG

Which of the following are key storage performance indicators that should be monitored?

Disk throughput Number of aborted disk commands Latency Number of disk commands queued

Identify following iSER configuration steps to their descriptions. If your environment supports jumbo frames, enable them for the adapter.

Enable jumbo frames for networking.

Identify following iSER configuration steps to their descriptions. Use the esxcli command to enable the VMware iSER adapter.

Enable the VMware iSER adapter.

Pluggable Storage Architecture (PSA) stack using a High-Performance Plug-In (HPP) with multipathing was made available to NVMe in vSphere 6.5. True or False?

False

Identify the disk latency metrics. The round-trip latency that the guest OS sees for all I/O requests sent to the virtual storage device.

GAVG

High-Performance Plug-in provided by VMware: Used with ultra-fast local and networked flash devices

HPP

Multipathing Plug-in: A multipathing module developed and provided by a third party

MPP

Identify following iSER configuration steps to their descriptions. If needed, change the default name and alias assigned to your adapter.

Modify general properties for iSCSI or iSER adapters.

Which path policy do active-passive storage arrays use by default?

Most recently used

Where can problems arise at the ESXi host level of a storage solution network?

NIC HBA

Native Multipathing Plug-in: Generic VMware multipathing module that is used with SCSI storage devices

NMP

What components are required when using NVMe over RDMA (RoCE v2)?

NVMe controller on your storage array. Ethernet switches supporting a lossless network Software NVMe over RDMA adapter enabled on your ESXi hosts Network adapter on your ESXi host that supports RoCE v2

Do you need to configure the Fibre Channel adapter to access FC-NVMe storage?

No, after you install the required hardware NVMe adapter, it automatically connects to all targets and controllers that it can reach.

Identify the disk latency metrics. The average queue latency.

QAVG

Which of the following is the performance metric that measures the number of commands queued: I/O operations that require processing?

QUED

Determine the storage queue type they describe, either "Queuing at the host" or "Queuing at the storage array". The VMkernel queue is an overflow queue for the device driver queue.

Queuing at the host

Determine the storage queue type they describe, either "Queuing at the host" or "Queuing at the storage array". The device driver queue controls the number of active commands on the LUN at any time.

Queuing at the host

Determine the storage queue type they describe, either "Queuing at the host" or "Queuing at the storage array". Queuing occurs when the number of active commands to a LUN is too high for the storage array to handle.

Queuing at the storage array

Determine the storage queue type they describe, either "Queuing at the host" or "Queuing at the storage array". The queue is on the LUN for VMFS datastores and at the protocol endpoint for vSphere Virtual Volumes datastores.

Queuing at the storage array

Storage Array Type Plug-in: Handles path failover for a given SCSI storage array

SATP

Identify following iSER configuration steps to their descriptions. This step is necessary only if your environment uses the Challenge Handshake Authentication Protocol (CHAP).

Set up CHAP for iSCSI or iSER.

What high-performance hardware features do ESXi hosts support?

Software and hardware iSCSI and NFS support for jumbo frames using 10 Gb, 20 Gb, 25 Gb and 40 Gb iSCSI hardware initiators. 32 Gb Fibre Channel Software and hardware iSCSI and NFS support for jumbo frames using 1 Gb, 10 Gb, 25 Gb, 40 Gb, 50 Gb and 100 Gb Ethernet NICs

Which of the following factors does the performance of shared storage in vSphere hinge on?

Storage queues Load balancing across available storage Proper configuration of your storage devices

When enabling the VMware iSER adapter you use the esxcli command to check and ensure that you meet which of the following requirements?

That you have installed the RDMA-capable adapter on your ESXi host. That your iSCSI storage supports the iSER protocol. That you have configured RDMA switch ports to create lossless connections between the iSER initiator and target. That you use the RDMA-capable switch.

You are monitoring disk throughput by VM in esxtop, and you would like to display a particular VMs VMDK statistics. You press 'e', and enter what information to do that?

The VMs GID

Which of the following is a good way to avoid oversubscribing links to storage?

Use Network I/O Control to help balance traffic.