After a host failure, a virtual machine has not restarted. Which two reasons could be the cause?
– Virtual machine was not protected by HA at the time of the failure

-Insufficient spare capacity on available hosts

– vSphere HA attempted to restart the virtual machine but encountered a fatal error each time it tried.
– Your cluster’s shared storage is Virtual SAN and one of the virtual machine’s files has become inaccessible due to the occurrence of more than the specified number of host failures.
– Restart actually succeeded.

An Administrator needs to review device statistics to troubleshoot an issue. The data currently being collected does not contain device level information. The administrator wants to avoid collecting any more data than is necessary to resolve the issue. What should be done to collect the requested data?
Level #3
Which two considerations are true for Storage Multipathing? (Choose two.)
1. The default SATP for iSCSI or FC devices is VMW_SATP_DEFAULT_AA and the default PSP is VMW_PSP_FIXED.

2. The default PSP for all devices claimed by VMW_SATP_ALUA is VMW_PSP_MRU.

Which two statements are incorrect regarding iSCSI adapters? (Choose two.)
1. Dependent Hardware iSCSI adapters do not require vmkernel networking.
2. Independent Hardware iSCSI adapters require vmkernel networking.
After configuring Storage I/O controls and setting congestion thresholds, an administrator notices that Storage I/O is not functioning correctly. What could be the cause of this?
Will not function correctly if you share the same spindles on two different datastores.
An administrator attempts to enable jumbo frames on a virtual switch. What is the max MTU size (in bytes) that the administrator can set?
What network is used for HA Network Heartbeat configuration on a Virtual SAN cluster?
SAN Network
A network administrator wants to take advantage of vSphere Network I/O Control 3 (NIOC3). What version must the vSphere Distributed Switch be at to support NIOC3?
When attempting to migrate a virtual machine with a USB device attached the compatibility check fails with the error message: “Currently connected device ‘USB 1’ uses backing ‘path:1/7/1’, which is not accessible”. Which two solutions will resolve the error? (Choose two.)
– Make sure that the devices are not in the process of transferring data

– Re-add and enable vMotion for each affected USB device

Which two virtual machine states would indicate a fault in the Virtual SAN cluster? (Choose two)
1 The virtual machine is non-compliant and the compliance status of some of its object is noncompliant

2. The virtual machine object is inaccessible or orphaned

In a Fully Automated Distributed Resource Scheduler (DRS) cluster with vMotion enabled, virtual machines are never migrated. Which three scenarios can cause this situation? (Choose three.)
– DRS is disabled on the virtual machine.
– Moving the virtual machine will violate an affinity rule.
– Virtual machine has a local device mounted.
When performing an ESXi scripted installation, what three access types are supported for script retrieval by the host? (Choose three)
An administrator wants to power off a virtual machine while connected to an ESXi host using SSH. The VM has the following Name and ID:
• VM Name = APP005

• ID = 00512 Which command

would successfully power off the virtual machine?

vim-cmd vmsvc/ 00512
Which two options are available for changing the virtual machine swap file location? (Choose two).
1. Store in the host’s swapfile datastore
2. Always store with the VM
Which two statements are incorrect regarding vSphere 6.x certificates? (Choose two.)
ESXi host upgrades do not preserve the SSL certificate and reissue one from the VMware Certificate Authority (VMCA).

ESXi hosts have self-signed SSL certificates by default.

In vimtop, which key displays the top four physical CPUs?
An administrator has enabled Storage DRS for a datastore cluster but storage DRS is disabled on one of the virtual machine disks in the datastore cluster Which two scenarios can cause Storage DRS to be disabled on a virtual disk? (Choose two)
1. The VM is a template.

2. The disk is a CD-ROM/ISO file

An administrator is setting up a clustered environment with two virtual machine nodes. The administrator wants to make sure that in the event of hardware failure of a host, neither of the VMs are ever on the same host at the same time. What could the administrator do to satisfy this requirement?
An administrator is noticing that SCSI reservations are causing an ESXi host to have very slow performance. Which two solutions could eliminate potential sources of SCSI reservation conflicts? (Choose two).
An administrator observes a warning on the vSphere High Availability (HA) cluster: “This host currently has no management network redundancy” Which two actions would address the warning? (Choose two.)
This message is displayed if the network redundancy configuration within the VMKernel Port Management Network is incorrect. An administrator can choose to ignore the warning or add an additional vmnic to comply with proper network redundancy.
Data Collection Level #1
■ Cluster Services (VMware Distributed Resource Scheduler) – all metrics
■ CPU – cpuentitlement, totalmhz, usage (average), usagemhz
■ Disk – capacity, maxTotalLatency, provisioned, unshared, usage (average), used
■ Memory – consumed, mementitlement, overhead, swapinRate, swapoutRate, swapused, totalmb, usage (average), vmmemctl (balloon)
■ Network – usage (average), IPv6
■ System – heartbeat, uptime
■ Virtual Machine Operations – numChangeDS, numChangeHost, numChangeHostDS

Best Practices
– Use for long-term performance monitoring when device statistics are not required.
– Level 1 is the default Collection Level for all Collection Intervals.

Data Collection Level #2
■ Level 1 metrics
■ CPU – idle, reservedCapacity
■ Disk – All metrics, excluding numberRead and numberWrite.
■ Memory – All metrics, excluding memUsed and maximum and minimum rollup values.
■ Virtual Machine Operations – All metrics

Best Practices
– Use for long-term performance monitoring when device statistics are not required but you want to monitor more than the basic statistics.

Data Collection #3
■ Level 1 and Level 2 metrics
■ Metrics for all counters, excluding minimum and maximum rollup values.
■ Device metrics

Best Practices
– Use for short-term performance monitoring after encountering problems or when device statistics are required.
– Because of the large quantity of troubleshooting data retrieved and recorded, use level 3 for the shortest time period (Day or Week collection interval).

Data Collection #4
– All metrics supported by the vCenter Server, including minimum and maximum rollup values.
Multipathing Considerations
■If no SATP is assigned to the device by the claim rules, the default SATP for iSCSI or FC devices is VMW_SATP_DEFAULT_AA. The default PSP is VMW_PSP_FIXED.
■When the system searches the SATP rules to locate a SATP for a given device, it searches the driver rules first. If there is no match, the vendor/model rules are searched, and finally the transport rules are searched. If no match occurs, NMP selects a default SATP for the device.
■If VMW_SATP_ALUA is assigned to a specific storage device, but the device is not ALUA-aware, no claim rule match occurs for this device. The device is claimed by the default SATP based on the device’s transport type.
■The default PSP for all devices claimed by VMW_SATP_ALUA is VMW_PSP_MRU. The VMW_PSP_MRU selects an active/optimized path as reported by the VMW_SATP_ALUA, or an active/unoptimized path if there is no active/optimized path. This path is used until a better path is available (MRU). For example, if the VMW_PSP_MRU is currently using an active/unoptimized path and an active/optimized path becomes available, the VMW_PSP_MRU will switch the current path to the active/optimized one.
■While VMW_PSP_MRU is typically selected for ALUA arrays by default, certain ALUA storage arrays need to use VMW_PSP_FIXED. To check whether your storage array requires VMW_PSP_FIXED, see the VMware Compatibility Guide or contact your storage vendor. When using VMW_PSP_FIXED with ALUA arrays, unless you explicitly specify a preferred path, the ESXi host selects the most optimal working path and designates it as the default preferred path. If the host selected path becomes unavailable, the host selects an alternative available path. However, if you explicitly designate the preferred path, it will remain preferred no matter what its status is.
■By default, the PSA claim rule 101 masks Dell array pseudo devices. Do not delete this rule, unless you want to unmask these devices.
Storage Array Type Plug-in (STAP)
VMware Pluggable Storage Architecture multipathing solution for the specific characteristics of the storage array. This is very important, since each storage array design differs substantially in detail and support, especially when it comes to load-balancing and failover between controllers, ports, and paths. So it is critical for VMware to have developed a standard interface to communicate with arrays.

SATPs allow load balancing across multiple paths, intelligent path selection, and over troubled conditions such as “chatter”, when passed rapidly fail back and forth between controllers.

SATP Critical Tasks
1. Decide which method of communication to use with the storage (PSA or native)
2. Monitor the health of the physical I/O channels or paths
3. Report any changes in the state of the paths up the stack
4. Perform actions required to fail over storage between controllers on the array
SATP Generic Plugins Storage
VMW_SATP_LOCAL – Local SATP for direct-attached devices

VMW_SATP_DEFAULT_AA — Generic for active/active arrays

VMW_SATP_DEFAULT_AP — Generic for active/passive arrays

VMW_SATP_ALUA — Asymmetric Logical Unit Access-compliant arrays

Additional SATP Plugins
VMW_SATP_LSI — LSI/NetApp arrays from Dell, HDS, IBM, Oracle, SGI

VMW_SATP_SVC — IBM SVC-based systems (SVC, V7000, Actifio)

VMW_SATP_CX — EMC/Dell CLARiiON and Celerra (also VMW_SATP_ALUA_CX)

VMW_SATP_SYMM — EMC Symmetrix DMX-3/DMX-4/VMAX, Invista


VMW_SATP_EQL — Dell EqualLogic systems

What are the two types of DRS Affinity Rules?
1. VM-VM Affinity – Group of VMs and a group of hosts.
2. VM-Host Affinity – Individual virtual machines

– Affinity Rule: Specifies that the members of a selected virtual machine DRS group can or must run on the members of a specific host DRS group.

– Anti-affinity rule: Specifies that the members of a selected virtual machine DRS group cannot run on the members of a specific host DRS group.

An administrator is noticing that SCSI reservations are causing an ESXi host to have very slow performance. Which two solutions could eliminate potential sources of SCSI reservation conflicts? (Choose two).
1. Reduce the # of snapshots
2. Upgrade the host to the latest BIOS.
Master & Slave Hosts
The hosts that mounts the most datastores has an advantage. Only 1 master per cluster and the other hosts are slave hosts. If the master host fails, is shut down or put in standby mode, or is removed from the cluster a new election is held.
Master Host Responsibilities
– Monitoring the state of slave hosts. If a slave host fails or becomes unreachable, the master host
identifies which virtual machines need to be restarted.
– Monitoring the power state of all protected virtual machines. If one virtual machine fails, the master
host ensures that it is restarted. Using a local placement engine, the master host also determines where
the restart should be done.
– Managing the lists of cluster hosts and protected virtual machines.
– Acting as vCenter Server management interface to the cluster and reporting the cluster health state

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