VCP Chap6

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Author:
daveg
ID:
254276
Filename:
VCP Chap6
Updated:
2014-01-05 19:03:13
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79 VCP VMware
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Description:
VMWare performing basic troubleshooting
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  1. What mode do you have to enter to retrieve diagnostic logs?
    Tech Support Mode (TSM)
  2. How do you access TSM?
    Logging onto the Direct Console User Interface (DSUI) or through Secure Shell (SSH)
  3. How do you enable TSM from the DCUI
    • Login to appliancde through the DCUI -> Troubleshooting options -> Enable ESXI
    • Shell
  4. How can you ensure the SSH session will end when not in use?
    From the troubleshooting options in the DCUI screen, select Modify ESXi Shell Timeout
  5. How would you configure TSM from the vSphere Client?
    Hosts Cluster - > [Select Host] -> Configuration Tab -> Security Profiles ->Properties
  6. Which of the following logs are not available from the DCUI?
    1. Syslog
    2. VMkernal
    3. Config
    4. Management Agent (hostd)
    5. Memory
    6. Virtualcenter Agent (vpxa)
    7. Vmware ESXi Observation Log (vobd)
    5 Memory
  7. If you wanted to see messages from the system components / VMKernal to otehr local files or to the remote host, what log would you use?
    1. Syslog
    2. VMkernal
    3. Config
    4. Management Agent (hostd)
    5. Virtualcenter Agent (vpxa)
    6. Vmware ESXi Observation Log (vobd)
    Syslog
  8. If you wanted to determine uptime and availability statistics, what log would you use?
    1. Syslog
    2. VMkernal
    3. Config
    4. Management Agent (hostd)
    5. Virtualcenter Agent (vpxa)
    6. Vmware ESXi Observation Log (vobd)
    VMkernel
  9. If you wanted to determine uptime and availability statistics, what log would you use?
    1. Syslog
    2. VMkernal
    3. Config
    4. Management Agent (hostd)
    5. Virtualcenter Agent (vpxa)
    6. Vmware ESXi Observation Log (vobd)
    VMkernel
  10. If a host hung , crashed or had an authentication issue, what log would you use?
    1. Syslog
    2. VMkernal
    3. Config
    4. Management Agent (hostd)
    5. Virtualcenter Agent (vpxa)
    6. Vmware ESXi Observation Log (vobd)
    Config
  11. If a host service connecting the vSphere Client to the ESXi host had a problem, what log would you use?
    1. Syslog
    2. VMkernal
    3. Config
    4. Management Agent (hostd)
    5. Virtualcenter Agent (vpxa)
    6. Vmware ESXi Observation Log (vobd)
    Management Agent (hostd)
  12. None of the logs help you and you're trying to troubleshoot a problem when your ESXIhost is connected to a vCenter, what log would you use?
    1. Syslog
    2. VMkernal
    3. Config
    4. Management Agent (hostd)
    5. Virtualcenter Agent (vpxa)
    6. Vmware ESXi Observation Log (vobd)
    Virtualcenter Agent (vpxa)
  13. Your host is having problems and you wanted to see what were the last configuration changes made to it, what log would you use?
    1. Syslog
    2. VMkernal
    3. Config
    4. Management Agent (hostd)
    5. Virtualcenter Agent (vpxa)
    6. Vmware ESXi Observation Log (vobd)
    Vmware ESXi Observation Log (vobd)
  14. How would you access a hosts logs from the vSphere client?
    Log into the host -> home ->administration -> system logs.
  15. Which of the following logs can you view by logging in to a host with a vSphere client?
    1. Syslog
    2. VMkernal
    3. Config
    4. Management Agent (hostd)
    5. Virtualcenter Agent (vpxa)
    6. Vmware ESXi Observation Log (vobd)
    • Management Agent (hostd)
    • VMkernal
    • Virtualcenter Agent (vpxa)
  16. You are installing ESXi and are having a problem booting from the proper device, what can you do?
    Reconfigure the boot order in theBIOS or select a boot device for the selection menu. If changed in the BIOS will impact subsequent boots, where as the boot selection menu is only the current boot.
  17. Which Ports are not used by vCenter Server? (select all that apply)
    1. 8080
    2. 389
    3. 80
    4. 516
    6. 903
    • vCenter Server uses: 80,443,8080,
    • 8443  Web Services
    • 389 LDAP
    • 636  vCenter Linked mode:
    • 902,903 - Used for management data and remote console sessions
  18. What determines the whther your server boots into the ESXI boot device or another boot device in ESXi embbedded?
    1. VPXA Agent
    2. BIOS Boot Configuration
    3. Extended BIOS boot Configuration
    4. Management Agent
    BIOS Boot Configuration
  19. What other BIOS setting should you consider when adjusting boot order? (Select all that apply)
    1. NX/XD
    2. VT
    3. SpeedStep
    4. MemoryLock
    5. Lockdown Mode
    • 1. NX/XD
    • 2. VT
    • 3. SpeedStep
  20. If you had a vSphere key with enough vRam for 13 processors and tried to install that that key on a host with 20 processors, would the key install?
    1. Yes, but only for 13 processors
    2. Yes, but only for 7 processors
    3. No.
    You would not able to install the key on the host nor the license keys that do not cover all the feature that you have enabled for a host.
  21. You had vSphere key with enough vRam for 13 processors and tried to install that that key on a host with 20 processors. The installation failed. What should you do?
    • Obtain and assign the appropriate key with a larger capacity
    • Upgrade the license edition to cover the features that you are using on your host
    • Disable the features that are not covered by the key that you are attempting to assign.
  22. What steps should you take if a vCenter plugin does not work?
    • Plug-ins that run on web server have extension.xml files in the extensions directory of your vSphere client.
    • The vCenter Server and the vSphere Client must be in the same domain or have access the URL of the plug-in server. If they are on different domains or the plug-in server URL is changed then the clients will not access the URL. Replace the hostname in the extension file with the ipaddress of the plug-in server
  23. What industry standard is used to gather host information?
    1. SNMP
    2. SMASH
    3. SNMP II
    4. DHCP
    • SMASH 
    • (System Management Architecture for Server Hardware)
  24. What are two ways to view host configuration information?
    • Log into the Host from vSphere:
    • Configuration -> Health Status

    • Log into the Host from vCenter
    • Host->Hardware Status Tab
  25. What does a yellow alarm indicate in the Hardware Status tab?
    Generally, degraded performance
  26. What does a red alarm indicate in the Hardware Status tab?
    That a component has either stopped has tripped the worst threshold possible.
  27. How would you export Host logs from a host log-in?
    Home -> System Logs ->Export System Logs from toolbar and select the logs.
  28. How would you export Host logs from a vCenter log-in?
    • Select root object
    • Go to "Administration Menu"
    • Select "Export System Logs"
    • Drill down to the logs of the object you want to export.
  29. A vSS has two port groups, production and testing. A VM on testing can access the network just fine, but the VM on production cannot connect to network resources. The vSS configuration has been checked and shows no problem. What might be the issue?
    Check the port group's settings. Any configuration options on a vSS will be overridden by conflicting options on a port group of the same switch.
  30. How would you check that a physical NIC is properly configured?
    You could look at the hardware status tab or the vSS/vDS panel under the networking tab.
  31. How many VMkernel management ports do you require?
    • At least
    • vSS - one per host
    • vDS - one per vDS

    Ideally more than one management port on a vDS or one VMkernel port for more than one vmnic
  32. Your VM is having a performance problem and you've determined it's not the host/storage. What should you check in the network?
    • 1. Each VM has VMWare Tools
    • 2. vmxne3 NIC driver are used
    • 3. VMs that communicate frequently should ideally be on the same host, switch and subnet
    • 4. Verify speed/duplex setting of NIC
    • 5. Seperate physical NICs for each type of traffic
    • 6. Consider upgrading 1 Gbps to 10 Gbps NICs
    • 7. vNIC drivers should be TSO compliant
  33. What two factors determinea VM's network perfromance?
    Application workload and network configuration
  34. You're seeing a lot of dropped packets what might be your problem?
    A bottlneck in the network
  35. Network performance is very slow. What might be the problem?
    Load balancing issues or a lack of load balancing altogether
  36. What tools can you use to determine if there are dropped packets?
    • esxtop
    • resxtop
    • Advanced performance charts
  37. What tools can you use in vCenter to verify your storage configuration?
    Storage Link and the Storage Views tab
  38. You would like to quickly identify the datasotre that accessible to a host, what tool would you use?
    The storage link on the host's configuration tab
  39. For extensive information about a host's storage configuration, where should you go in vCenter?
    The storage views tab.
  40. Your host is experiencing storage contention issues, where would you modify the path settings?
    Storage Link in the configuration tab. Storage Views only lets you view the settings.
  41. What are some symptoms of storage contention?
    VM slowness • VM freezing • Slow file transfers
  42. Name three factors that may impact storage peformance:
    • Excessive SCSI reservation
    • Path thrashing
    • Inadequate LUN queue depth
  43. What might cause "excessive reservations"?
    • Operations that require a file lock or a metdata lock in VMFS. These might include:
    • - creating or deleting a file
    • - creating a template
    • - deploying a VM from a template
    • - creating a new VM
    • These create a short lived SCSI reservation, which temporarily locks the entire LUN (prior to ESXi 5.0) or metadata database. Excessive SCSI reservations by one host can impact others accessing the same VMFS.
  44. Identify 5 steps to address "excessive reservations" in older hosts
    • 1. latest BIOS updates
    • 2. latest HBA firmware
    • 3. use more small LUNs
    • 4. reduce number of VM snapshots
    • 5. reduce number of VMs per LUN
  45. What is the maximum number of VMs per VMFS-5?
    2048
  46. What is Path Thrashing and when is it most likely to occur?
    Active-passive arrays. Two hosts attempt to access the same LUN through different storage processors. Result: LUN is often seen as unavailable to both hosts.
  47. How do you prevent Path Thrashing?
    Use the default setting for the Path Selection Policy (PSP) of Most Recently Used.

    Ensure hosts sharing same LUN on active-passive array use same storage processor.
  48. How do you prevent Path Thrashing on Active/Active Arrays?
    Properly configured Active/Active Arrays do not cause path thrashing.
  49. VMs are slow accessing an iSCSI device. You've checked the host, network, VM, and physical storage and nothing's wrong. What might be the problem?
    The ESXi host might generate too many commands to a LUN, causing some to be queued by the VMkernal, increasing latency. Usually a misconfigured setting of LUN queue dpeth is the cause. Determine the proper LUN queue depth from your storage vendor documentation and then adjust Disk.SchedNumReqOutstanding accorrdingly.
  50. Which of the following requirements do not apply to HA? (select all that apply)
    1. Compatible CPUS in all hosts
    2. Hosts have a minimum of 1 Gbps NICs
    3. VMs on host are not attached to lcoal CD-ROM or ISOs that are loaded
    4. VMs are not connected to an interal switch with no uplinks
    • 1. Compatible CPUS in all hosts
    • 2. Hosts have a minimum of 1 Gbps NICs
    • 3. VMs on host are not attached to lcoal CD-ROM or ISOs that are loaded
    • 4. VMs are not connected to an interal switch with no uplinks
  51. What requirements are common to HA, DRS and vMotion?
    • 1 Gbps NICs
    • Common datastore
    • Common network

    ***other requirement s for HA and DRS
  52. What are the requirements for storage vMotion?
    • Host access to source/destination datastores
    • 1 Gbps NIC
    • VM's disks are in persistent mode or be RDMs
  53. Identify four steps  to verify a vMotion configuration
    • 1. Defined a VMkernal port on both switches for vMotion.
    • 2. IP Addresses should be on the same subnet, point-to-point is best.
    • 3. Identical port group names
    • 4. Shared datastore between hosts
  54. Identify 3 steps to checking HA configuration beyond the basic requirements. 
    • 1. Confirm HA is enabled for cluster (right click on cluster->edit settings 
    • 2. Verify HA monitoring is enabled
    • 3. Confirm the Policies (admission control and affinity rules)
  55. A VM cannot start in a HA cluster or the Cluster cannot run as many VMs as expected, what's one thing you should check?
    Admission control policy. Recheck HA settings. 
  56. An HA cluster has the default isolation response configured for shut down. What can an administrator do to make the diagnostics underlying that decision more accurate
    Devote a separate network to heartbeats and management.
  57. If you would like to see a graphical representation of each VM's resource usage where should you look 
    Resource Distribution Chart accessed from the summary panel. 
  58. The load on a cluster is imbalanced. What should you check?
    • 1. The cluster or VMs are not set to fully automated. 
    • 2. Migration Threshold or VM-VM-Host affinity rules might have intentionally allowed the imbalance.
    • 3. Check that there are no VMs using a large amount of resources that cannot be vMotioned. 
    • 4. One huge VM restricted to a specific host
  59. What tool would you use to graphically illustrate your vMotion configuration?
    Use the vMotion Resource Map by selecting the VM on console and opening the Maps tab

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