I had a very interesting question recently about how vSAN handles a failure in an object that is running with an erasure coding configuration. In the case of vSAN this is either a RAID-5 or a RAID-6. On vSAN, a RAID-5 is implemented with 3 data segments and 1 parity segment (3+1), with parity striped across all four components. RAID-6 is implemented as 4 data segments and 2 parity segments (4+2), again with the parity striped across all of the six components. So what happens when we need to continue writing to one of these objects after a component/segment has failed.
After discussing this with one of our vSAN engineering leads, the answer is that it depends on which offset you are writing to. Let’s take RAID-5 as an example. The RAID-5 VMDK object address space is split into 1 MB stripes. If we take the 3 of the 4 RAID-5 components together, this makes up one contiguous 3 MB range. We refer to this a row which is distributed over the three components. The fourth component is used for parity. The component used for the parity gets rotated for each row.
First, we will look at a row that has lost a data component. Let’s take the first row. Future writes to the 0-2 MB range in the object address space will be unaffected. They will still go to their respective data component (either 1 or 2). Writes to the 2-3 MB range will read data from Comp1 and Comp2, calculate the new parity based on all 3 data components, and then write parity in Comp4. But of course there cannot be a write to Comp3 as it is now failed/missing. This same procedure applies to all other rows that are missing data due to a failure of Comp3.
Let’s now look at a row that has lost its parity component, for example, row 2. Writes to the 3-6 MB range will just write the data to Comp1, Comp2 and Comp4 as normal with no parity. Hence there are no parity reads associated with this write operation. In this case there is a reduction in the amount of IO amplification involved. For RAID-5 writes, we would typically have to read the existing data and parity, write back the new data, calculate the new parity and write it back. Now, with rows that have parity on the failed component, the reads and writes will not be amplified. In fact, as we have seen, reads and writes are decreased from 2 to 1 in cases where parity on the affected component.
So, to recap, we still maintain a 3+1 RAID-5 arrangement for data placement, but there is a “functional repair” whereby we include the data that cannot be written in the parity calculation. We can then use that parity (with the other two data components Comp1 and Comp2) to reconstruct the original data if we need to service a guest read, or of course to resync to Comp3 when it recovers.
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You may configure any Kubernetes distribution to access VMware vSphere VMDK Volumes. This includes using VMware vSphere VMDK Volumes as persistent volumes for application data with Datrium. The vSphere Cloud Provider allows using vSphere managed storage for Volumes, Persistent volumes, Storage classes, and provisioning volumes. Datrium presents a single-namespace (or multiple) datastore to vSphere that is then abstracted by Kubernetes.
Dynamic Volume Provisioning
Dynamic volume provisioning allows storage volumes to be created on-demand. Without dynamic provisioning, cluster administrators have to manually make calls to their cloud or storage provider to create new storage volumes, and then create PersistentVolume objects to represent them in Kubernetes. The dynamic provisioning feature eliminates the need for cluster administrators to pre-provision storage. Instead, it automatically provisions storage when it is requested by users.
To enable dynamic provisioning, a Kubernetes cluster administrator needs to pre-create one or more StorageClass objects for users. StorageClass objects define which provisioner should be used and what parameters should be passed to that provisioner when dynamic provisioning is invoked.
Backing Up Persistent Volumes
Kubernetes provisions new volumes as persistent independent disks to freely attach and detach the volume on any node in the cluster, and for Datrium DVX each persistent volume is an independent VMDK.
As a consequence, it is not possible to backup volumes that use VMware snapshots, and VMware recommends stopping the application utilizing the PV, cloning the PV, restarting the application.
Datrium can uniquely address Kubernetes persistent volumes backup and replication with native non-disruptive snapshots that have zero impact on volumes and applications usability or performance.
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CRN, a brand of The Channel Company, has recognized three VMware products as part of their 2018 Products of the Year Awards:
VMware Cloud on AWS – overall winner in the Hybrid Cloud category
VMware NSX updates named as a finalist in the Software-Defined Networking category
VMware vSAN 6.7 – overall winner in the Software-Defined Storage category
Products and services named on this list represent best-in-breed technological innovation, financial opportunity for partners, and customer demand. For the third year in a row, the winners were determined through a combination of editorial selection and a survey fielded to solution providers, who are currently selling both the technology and specific vendor product, to accurately capture real-world satisfaction among partners and their customers.
We are thrilled to announce that Workspace ONE Boxer supports Google’s G Suite! Customers using G Suite for corporate email will now be able to deliver our secure, containerized email app, Workspace ONE Boxer to their employees. Equipped with time-saving workflows and features built for business users, Boxer’s all-in-one email, calendar, and contacts app is ideal for enterprises seeking a blend of consumer simplicity and enterprise security.
Today, Boxer seamlessly integrates with enterprise email services Exchange, Office 365, Outlook, IBM Notes and personal email services Yahoo, iCloud and Gmail. Boxer also works with third-party business apps like Office 365, Box, Google Drive, and our other Workspace ONE productivity applications to simplify file attachment workflows while maintaining enterprise security
With support for Google’s enterprise solution G Suite, we’re able to provide a secure, containerized email, calendar and contacts solution for more customers than ever before.
This is an exciting time for customers using G Suite! Thanks to our partnership with Google, we can enable enterprises to go further and faster into their digital workplace transformation journey and support a wider range of customers and use cases. It is a true recognition of Workspace ONE’s ability to work across systems while providing the best, secure experience for business users. G Suite and Boxer is a unique combination for organizations willing to leverage best of breed solutions, while modernizing their environment.
Gregory Lehrer/Sr Director, Head of Technology Alliances, VMware
Joint customers of G Suite and Boxer will also be able to take advantage of advanced integrations such as Workspace ONE mobile flows. Workspace ONE mobile flows provide the framework to enable developers to build context-based notifications and actions into Boxer for their users. Organizations have the option of using pre-built connectors we’ve provided to backends like Salesforce and ServiceNow or custom developed connectors based on workflow requirements.
A company wants to virtualize the SAP (Business Application) for the first time. The company has to ensure high availability for its virtualized workloads, so it has explored several vSphere features and would like to review the findings.
Which two features improve SAP’s availability and recoverability? (Choose two.)
vSphere High Availability
Single Root I/O Virtualization (SR-IOV)
VMFS file system
VMware vSphere vMotion
Sample Question 2
A latency-sensitive, legacy business-critical application must be migrated to a vSphere cluster.
The application does NOT support application-level failovers.
The application owner would like to leverage virtualization features like high availability and vMotion to increase availability during failures and maintenance operations.
Which two performance optimizations can be enabled in this scenario? (Choose two.)
Enable the host and virtual machine for SR-IOV.
Enable the host and virtual machine for appropriate network buffer sizes.
Enable the host and virtual machine for Uniform Memory Access (UMA).
Enable the host and virtual machine for SplitTx and SplitRx.
Sample Question 3
During a recent maintenance window, a customer experienced a hardware failure of an ESXi host. As a result of degraded capacity, vSphere HA was unable to restart a number of virtual machines (VMs).
Which sizing strategy will allow the cluster to maintain the ability for HA to restart VMs during maintenance windows while keeping hardware resources at a minimum?
N-1
N+1
N+2
N=3
Sample Question 4
A network administrator has specified that Link Layer Discovery Protocol (LLDP) must be supported in his company's vSphere network design.
Which type of virtual switch can be used?
vSphere Standard Switch
Open vSwitch
vSphere Distributed Switch
Cisco Nexus 1000v Switch
Sample Question 5
A solution architect has been tasked with designing a new environment that meets the needs of a growing company, and has obtained this information:
Blade servers are the current required standard and are configured with 2x12 core CPUs, 384GB of memory, no HDD, and a single dual port 10Gb Converged Network Adapter.
Based on the server's Mean Time Between Failure, the design must accommodate a single blade failure without affecting performance.
The current delivery time for the servers is 90 days.
The Dell storage is currently 100% configured, utilizing Raid5 volumes of which 40% of the array is currently free space.
The current Data Domain backup solution has been determined to have enough space to accommodate the additional virtual machines that were sized according to the application team's requirements and the backup team's retention policies.
Based on this information, which two statements are risks for the new design? (Choose two.)
The server delivery date may be more than 90 days.
Blade servers will not perform as optimally as rackmount servers.
The retention policy for backups meets company requirements.
The failure if a second disk during a diskgroup rebuild will result in data loss.
Sample Question 6
A customer has four VLANs: Management, vMotion, iSCSI, and Application.
The network team requires each type of traffic to be on its own VLAN.
The security team requires Layer 3 connectivity to each network for monitoring.
Which two settings must be configured? (Choose two.)
Multiple NICs
Custom TCP/IP Stack
vMotion TCP/IP Stack
One VMkernel port per network
Sample Question 7
A customer requires Windows Server Failover Clustering between physical and virtual servers.
The environment design of the storage must meet this requirement.
The customer wants to use storage as efficiently as possible, including granularity, QoS, VAAI, etc.
Which type of storage for a physical RDM proxy file can be used?
NFS
VMFS
vSAN
DVVol
Sample Question 8
A company is deploying a modern video news-streaming application.
The application is capable of scaling (expanding and collapsing) its streaming nodes on demand.
To host the application, the company decided to implement a new VMware cluster with vSphere 6.5.
vMotion is not supported by the application.
Using VMware-recommended best practices, where should the company place the swap file?
On replicated datastores
On local solid state drives
On thin-provisioned LUNs
On hardware-encrypted drives
Sample Question 9
A solutions architect is building a new data center at a remote site for a company.
All of the necessary virtual machine templates are already stored in a Content Library at the main office.
The company also needs the ability to rapidly deploy virtual machines throughout the next year in this site.
Which vCenter Server deployment strategy will meet these requirements?
The new vCenter Server should manually subscribe to the Content Library at the main site and download contents only when needed.
The new vCenter Server should join the existing SSO domain, automatically subscribe to the published Content Library, and download all of the contents.
The new vCenter Server should manually subscribe to the Content Library at the main site and download all the contents of the published library immediately.
The new vCenter Server should join the existing SSO domain, automatically subscribe to the published Content Library, and download the contents only when needed.
Sample Question 10
A company is consolidating its IT operations efforts by moving the Finance, IT, and QA departments towards a selfservice environment, following SDDC best practices.
All departments have different priorities and expectations for uptime of the required infrastructure and applications.
Project stakeholders are still discussing final approvals for the budget with the CFO.
To drive down the operating cost of the environment, only blade servers will implement this project.
To ensure business continuity, a colocation provider was chosen to fail over virtual machines.
The implementation of the project will follow a public reference architecture provided by VMware.
Which is the risk in this scenario?
The chosen architecture is sufficient.
All departments demand different SLAs.
Final budget approvals are being discussed.
The environment will be shared by several departments.
VMware 3V0-624 Exam Answer Key:
1-A and D; 2-B and D; 3-C; 4-C; 5-A and D; 6-B and D; 7-B; 8-B; 9-C; 10-C.
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VMware Certified Advanced Professional 6.5-Data Center Virtualization Design | VMware 3V0-624 Practice Test Questions
This exam tests a candidate's awareness of the VMware Certified Advanced Professional 6.5 in Data Center Virtualization Design is capable of developing a conceptual design given a set of customer requirements, determining the functional requirements needed to create a logical design, and architecting a physical design using these elements. Candidates possess an advanced knowledge of end-user computing environments and components, enabling them to recommend and design VMware solutions to meet specific goals and requirements. The successful candidate will likely hold one or more industry-recognized general IT certifications or accreditation. The MQC must have a VMware Certified Professional certification and should have all the knowledge contained in the VCAP6.5-DCV Design exam blueprint listed below.
VMware 3V0-624 Certification Exam Syllabus and Study Guide
Section 1. Create a vSphere 6.5 Conceptual Design.
Objective 1.1 – Gather and analyze business requirements.
Objective 1.2 – Gather and analyze application requirements.
Objective 1.3 – Determine risks, requirements, constraints, and assumptions.
Section 2. Create a vSphere 6.x Logical Design from an Existing Conceptual Design.
Objective 2.1 – Map business requirements to a vSphere 6.x logical design.
Objective 2.2 – Map service dependencies.
Objective 2.3 – Build availability requirements into a vSphere 6.x logical design.
Objective 2.4 – Build manageability requirements into a vSphere 6.x logical design.
Objective 2.5 – Build performance requirements into a vSphere 6.x logical design.
Objective 2.6 – Build recoverability requirements into a vSphere 6.x logical design.
Objective 2.7 – Build security requirements into a vSphere 6.x logical design.
Section 3. Create a vSphere 6.x Physical Design from an Existing Logical Design.
Objective 3.1 – Transition from a logical design to a vSphere 6.x physical design.
Objective 3.2 – Create a vSphere 6.x physical network design from an existing logical design.
Objective 3.3 – Create a vSphere 6.x physical storage design from an existing logical design.
Objective 3.4 – Determine appropriate computer resources for a vSphere 6.x physical design.
Objective 3.5 – Determine virtual machine configuration for a vSphere 6.x physical design.
Objective 3.6 – Determine data center management options for a vSphere 6.x physical design.
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What New Features and Improvements are Coming in Announced VMware vSAN 6.7 Update?
vSAN Empowers You to Accelerate Your Business Through Hyper-Converged Infrastructure
vSAN is a critical component of the VMware Digital Foundation, a ubiquitous control plane from edge to core to cloud, which provides organizations leading agility and availability with a turn-key hybrid cloud architecture. VMware Hyper-Converged Infrastructure (HCI) supports more hybrid cloud use cases than any other solution today.
vSAN 6.7 Update 1 makes it easy to adopt hyper-converged infrastructure through simplified operations that accelerate time-to-value for day one and two tasks. This release also uses infrastructure more efficiently through automated space reclamation, which lowers storage total cost of ownership. ReadyCare expedites resolution by diagnosing issues faster and enhances self-help with centralized health monitoring.
PRODUCT ENHANCEMENTS
The most significant new capabilities and updates of vSAN 6.7 Update 1 include:
Guided HCI Cluster Creation and Extension
A new guided cluster creation and extension workflow provides an exhaustive wizard to assist the admin with day one and two operations. This workflow gives the admin confidence that all steps have been done in the proper sequence to stand up a cluster. It also includes stretched clusters.
VUM Based Firmware and Driver Update
VUM gives admins confidence that they are performing consistent lifecycle management across the cluster. This update automates the patching of host IO controller firmware and drivers for Dell, Fujitsu, SuperMicro and Lenovo ReadyNodes. Health checks now alert customers to new patch availability. VUM provides automated patch management for an HCI cluster and manages both compute and storage firmware from vCenter.
Intelligent Maintenance Mode
Intelligent maintenance mode ensures consistent application performance and resiliency during maintenance operations. vSAN provides guardrails by advising users when entering a host into maintenance mode may affect performance, and proactively fails maintenance mode if it is not predicted to succeed.
PowerCLI and SPBM Enhancements
vSAN gains new advanced cluster settings in the UI and new cmdlets in Power CLI. In addition, vSAN automates backup and recovery of SPBM policies in scenarios where vCenter is replaced or recovered after a failure.
UNMAP Integration for Storage Efficiency
UNMAP automates space reclamation, reducing capacity used by applications. vSAN integrates with guest OS initiated SCSI UMAP requests, freeing space when guest OS files are deleted or truncated. In addition, this feature avoids de-staging of unused data in the capacity tier.
Mixed MTU with Witness Traffic Separation
Enables flexible network topographies in stretched cluster scenarios. This allows the witness to have a lower MTU than vSAN data traffic, allowing businesses to protect their investments in network infrastructure.
Health Service Enhancements
Health service enhancements expedite self-help so customers can quickly resolve issues. Updates in this release include a proactive network performance test, ability to silence health checks from the UI, reduction in false positives for some health checks, and a health check summary with shows the status of all health checks in a single location with a brief description and proposed action item for each.
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