Term
| What 3 resource management capabilities are introduced with Storage DRS? |
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Definition
| Space Utilization Load Balancing, I/O Latency Load Balancing, Anti-Affinity Rules |
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Term
| Describe how SDRS brings Space Utilization Load Balancing |
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Definition
| A threshold can be set for space use. When usage exceeds the threshold, SDRS will generate recommendations or perform migrations to balance the space |
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Term
| Describe how SDRS brings I/O Latency Load Balancing |
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Definition
| A threshold for latency can be set to avoid a bottleneck. SDRS will migrate VMs in order to alleviate the high I/O |
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Term
| Describe how Anti-Affinity rules work |
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Definition
| Rules can be created to separate disks of a VM to different datastores |
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Term
| What level can SDRS be applied |
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Definition
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Term
| If SDRS is applied at a cluster level and then a change to SDRS is applied on a VM within that cluster, which takes priority? |
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Definition
| The change on the VM level over-rides the cluster level policy for SDRS |
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Term
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Definition
| At a configured frequency (default 8 hours) and when a datastore within the cluster exceeds it's space threshold |
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Term
| What reason would SDRS have to make a recommendation? (Name 2) |
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Definition
1. Balance datastore space used
2. Balance datastore I/O load |
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Term
| Under what circumstances might SDRS make mandatory recommendations? |
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Definition
| The datastore is out of space, Anti-affinity or affinity rules are being violated, or the datastore is entering maintenance mode and must be evacuated |
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Term
| Outline the process for configuring SDRS |
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Definition
1. In the datastores inventory, right click and select 'New Datastore Cluster'. Name your cluster and check 'enable SDRS'
2. Follow the wizard through: select automation level, runtime rules, advanced options
3. Select hosts or clusters you wish to add the datastore cluster to
4. Select the datastores you wish to include in the datastore cluster |
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Term
| If you enable I/O metrics for recommendations under SDRS runtime rules, what happens to Storage I/O control |
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Definition
| Storage I/O control would be enabled on all datastores in the cluster |
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Term
| What are the default utilized space and I/O latency thresholds for I/O control? |
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Definition
| 80% utilized and 15ms latency |
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Term
| If you right click a datastore cluster and click 'edit settings' after setting up SDRS, what additional options are available? |
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Definition
1. SDRS Scheduling - Used to change the thresholds and settings in order to balance your datastores at a scheduled time
2. Affinity and anti affinity rules - on a per VM basis
3. Virtual machine settings - can change automation level on a per VM basis, as well as to keep vmdk's together or not |
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Term
| What is Enhanced vMotion Compatibility (EVC)? |
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Definition
| EVC is a feature that will hide or mask certain CPU instructions from the CPUs in all hosts in a cluster to improve CPU compatibility between hosts, allowing for vMotion to occur. EVC leverages AMD-V Extended Migration technology (AMD) and Intel Flexmigration (Intel) in order to come up with a common baseline processor which inEVC terms is the EVC mode. |
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Term
| List the requirements for hosts and VMs in order to use EVC |
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Definition
* All VMs in the cluster using a feature set greater than the target EVC mode must be powered off or migrated out of the cluster before enabling EVC
* All hosts must have CPUs from a single vedndor
* All hosts must be on ESX/ESXi 3.5 U2 or higher
* All hosts must be connected to vCenter
* All hosts must have their advanced features enabled (AMD-V or Intel VT as well as No Execute NX or Intel eXecute Disable XD)
* All hosts should be configured for vMotion
* All hosts must have the supported CPUs for the mode you enable |
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Term
| Outline the steps to create a new EVC cluster |
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Definition
| Create an empty cluster, enable EVC and select the desired EVC mode. Select hosts you wish to move into the cluster. IF the host feature set is greater than the EVC mode then power off the VMs on the host or migrate the VMs to another host. Drag the host into the cluster. |
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Term
| Outline the steps to enable EVC on an existing cluster |
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Definition
Select the cluster - power off or migrate VMs that reside on hosts with feature sets greater than the desired EVC mode (and then migrate back after enabling.)
Ensure the cluster has a standard vendor for CPU on its hosts
Edit the cluster settings
Power VMs on and migrate back |
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