MCQs and Answers

1. 1. What Are The Major Components Of Symmetrix Vmax?

   System Bay: 

   • VMAX Engines 
   • Matrix Interface Board Enclosure (MIBE) 
   • Power subsystem components 
   • Standby power supplies (SPS) 
   • Service Processor (server, keyboard/video/mouse, UPS). 

   VMAX Engine:
    

   Symmetrix VMAX systems provide up to eight VMAX Engines within a system bay on standard configurations and up to four VMAX Engines on extended drive loop configurations. Each VMAX Engine includes: 

   Two directors that support front-end, back-end and SRDF connections. Each director has:

   • 16, 32, or 64 GB of physical memory 
   • One System Interface board (SIB) that connects the director and the Matrix Interface Board Enclosure (MIBE) 
   • Two Back End I/O Modules (2 ports, 4 Gb/s) that connect to storage bay drives. 
   • Two I/ O Module carriers that provide connectivity between each director and the front-end I/O ports. Front End 

   I/O Modules support:
    

   • Fibre Channel host connectivity (4 ports, 2, 4, or 8 Gb/s) 
   • Fibre Channel SRDF connectivity (2 ports, 2, 4, 8 Gb/s) 
   • FICON host connectivity (2 ports, 2, 4, or 8 Gb/s) 
   • iSCSI host connectivity (2 ports, 1 Gb/s) 
   • GigE SRDF connectivity. 
   • Two Management Modules that provide environmental monitoring 
   • Two VMAX engine power supplies 
   • Four cooling fans. 

   Storage Bay:
    

   • Disk array enclosures (DAEs) 
   • Power subsystem: PDPs, PDUs, AC connectors 
   • Standby power supply unit (SPS) 
   • Disk array enclosures (DAEs) 

   Each disk array enclosure contains:
    

   • Two redundant disk array enclosure power /cooling fans 
   • Two link control card (LCC) modules 
   • From 5 to 15 drives per direct-attach enclosure 
   • From 4 to 15 drives per daisy-chain enclosure.

2. 2. What Are The Features Of Vmax Se?

   Supported Disks:
   48 to 360 disks 

   Single V-Max Engine—two directors.

   FICON, Fibre Channel, iSCSI, Gigabit Ethernet connectivity.

   Up to 128 GB global memory.

Networking Interview Questions

3. 3. What Are Features Of V-max?

   • 96 to 2,400 disks, up to 2 PB—three times more usable capacity.
   • One to eight V-Max Engines (16 directors). 
   • Up to 1 TB (512 GB usable) global mirrored memory.
   • Twice the host ports—Fibre Channel, iSCSI, Gigabit Ethernet, FICON connectivity (up to 128 ports*). 
   • Twice the back-end connections for Flash, Fibre Channel, and SATA drives (up to 128 ports). 
   • Quad-core 2.3 GHz processors to provide more than twice the IOPS.
   • Virtual Matrix architecture connects and shares resources across director pairs, providing massive scalability.

4. 4. What Are The Management Tools For Symmetrix Vmax?

   Symmetrix Management Console:
    

   The primary interface for managing Symmetrix arrays. 

   EMC z/OS Storage Manager (EzSM):
    

   An Interactive System Productivity Facility (ISPF) interface that manages Symmetrix system arrays in mainframe environments. 

   EMC Control Center:
    

   An intuitive, browser-based family of products that provides management of the overall storage environment, including multi vendor storage reporting, monitoring, configuration, and control. 

   EMC Solutions Enabler SYMCLI:
    

   A library of commands that are entered from a command line or from a script. 

   EMC SMI-S Provider:
    

   An SMI-compliant interface for EMC Symmetrix and CLARiiON arrays.

Networking Tutorial

5. 5. What Are The Supported Disk Drive Types In Vmax?

   Symmetrix VMAX systems support Flash, Fibre Channel, and SATA II drives.

Data Center Management Interview Questions

6. 6. What Are The Features Of Enginuity 5874?

   Auto-provisioning Groups:
    

   Simplifies provisioning of configurations with a large number of hosts by allowing the creation of initiator, port and storage groups. Auto-provisioning Groups is especially helpful in large, virtualized server environments that require the availability of many volumes to many host initiators and many storage ports. 

   Dynamic configuration changes
   : 

   Allows the dynamic configuration of BCV and SRDF device attributes. Decreases impact to hosts during BCV and SRDF set and clear operations. 

   Concurrent configuration changes:

   Provides the ability run scripts concurrently instead of serially. 

   New Management Integration:

   New Management Integration features free up host resources and simplify Symmetrix system management by allowing you to:

   • Load Symmetrix Management Console on the Service Processor.
   • Attach the Service Processor to your network. 
   • Open a browser window from any server in the network. 
   • Manage the Symmetrix system from anywhere in your enterprise. 

   SRDF Features:

   SRDF Extended Distance Protection (SRDF/EDP), Add and remove dynamic devices to SRDF/A (consistency exempt), Two-mirror SRDF Enginuity Consistency Assist (ECA), SRDF/Star with R22 device protection, 250 SRDF group support ,etc.. 

   Tiered storage optimization:

   Fully Automated Storage Tiering (FAST) — Reduces cost for performance, saves energy, and simplifies storage tier management by allowing the dynamic allocation of data across storage tiers, based on user defined policies and on the changing performance requirements of the applications. 

   Enhanced Virtual LUN technology:
    

   Provides the ability to non disruptively change disk and protection type of a logical volume, and allows the migration of open systems, mainframe, and IBM i volumes to unallocated storage, or to existing volume.

   Virtual Provisioning:
    

   Simplifies storage management:
    

   Improves capacity utilization by allowing the allocation of more storage to than is physically consumed by a host at onset, and is allocated, as needed, from a shared pool. 

   Automates pool re balancing:
    

   Allows users to nondisruptively balance workloads and extend thin pool capacity, in small increments if required, while maximizing performance and reducing total cost of ownership.

7. 7. Can We Run The Concurrent Configuration Change Sessions On Vmx?

   Yes, each session holds the different configuration change locks.

IBM Mainframe Tutorial
IBM Mainframe Interview Questions

8. 8. How Many Configuration Change Sessions We Can Run Concurrently On Vmax?

   Up to four concurrent configuration change sessions are allowed to run at the same time, when they are non-conflicting. This means that multiple parallel configuration change sessions can run at the same time as long as the changes do not include any conflicts on Device back-end port, Device front-end port and on Device.

9. 9. How Do You List The Reserved Devices?

   Symconfigure -sid “SymID” list -reserved.

Netapps Interview Questions

10. 10. What Are The Advantages Of Auto-provisioning Groups?

    • Eliminates of searching for required storage on arrays.
    • Eliminates the mapping and masking devices which requires separate tasks for each initiator/port combinations. 
    • Eliminates the host interruptions. 
    • Eliminates the storage reclamation.
    • Initiators can be dynamically added or removed from initiator groups. 
    • Ports can be dynamically added or removed from port groups.
    • Storage can be dynamically added or removed from storage groups.

11. 11. What Are The Different Types Of Ports Can Be A Member Of Initiator Group?

    Only Fibre and Gig-E ports on front end directors allowed.

EMC Interview Questions

12. 12. What Are The Restrictions Of Initiator Group?

    • Initiator can belongs to only one Initiator Group.
    • Maximum of 32 Initiators contains one initiator group. 
    • Initiator groups can be cascaded.

Networking Interview Questions

13. 13. What Are The Steps To Replace A Faulty Hba?

    • Find out and Note down the old HBA WWN
    • Symaccess list logins
    • Swap out the old HBA card with new HBA 
    • Discover the new HBA and note down the WWN 
    • Symaccess discover hba or symaccess list hba 
    • Replace the WWN 
    • Symaccess -sid “SymID” replace -wwnn “old WWN” -new_wwn “news WWN” 
    • Establish the new alias for the HBA 
    • Symaccess discover hba -rename

14. 14. What Are The Advantages Of Thin Provisioning?

    • Reduce the amount of allocated but unused physical storage. 
    • Avoid over allocation of physical storage to applications.
    • Reduces energy consumption and footprint. 
    • Provision independently of physical storage infrastructure. 
    • Minimize the challenges of growth and expansion. 
    • Simplifies data layout. 
    • Saves costs by simplifying procedures to add new storage. 
    • Reduces disk contention and enhances performance. 
    • Maximize return on investment.
    • Avoided the application interruptions/host downtime.

15. 15. Can You Explain Step By Step Procedure To Implement Virtual/thin Provisioning?

    Creating Data Devices:
     

    Symconfigure -sid “SymID” -cmd “create dev count=16, config=2-Way-Mir, attribute=datadev, emulation=FBA, size=4602;” commit -v -nop 

    Creating Thin Pool: 

    symconfigure -sid “SymID” -cmd “create pool PoolName type=thin;” commit -nop 

    Adding Data Devices to thin pool:
     

    Symconfigure -sid “SymID” -cmd “add dev 10E4:10E5 to pool PoolName type=thin, member_state=ENABLE;” commit -nop 

    Creating Thin Devices:
     

    symconfigure -sid “SymID” -cmd “create dev count=16, size=4602, emulation=fba, config=TDEV;” commit -nop 

    Binding Thin devices to Thin Pool:
     

    symconfigure -sid “SymID” -cmd “bind tdev 10F4:10F7 to pool PoolName;” commit -nop

Storage Area Network Interview Questions

16. 16. How Many Thin Pools Can We Create In An Array?

    The number of pools that can be configured in a Symmetrix array is 512. 

    This is the total number of pools, including Virtual Provisioning thin v pools, SRDF/A Delta Set Extension (DSE) pools, or Time Finder/Snap pools.

17. 17. Maximum No. Of Data Devices In A Thin Pool?

    As many as data devices can be member of a thin pool, however the limit to the number of thin and data devices that can be configured within a Symmetrix system is 64,000.

Mainframe DB2 Interview Questions

18. 18. What Are The Thin Pools Recommendations When You Are Adding Data Devices?

    • Only data devices may be placed in a thin pool. 
    • The data devices must all have the same emulation. 
    • The data devices must all have the same protection type. 
    • It is recommended that data devices in a pool all reside on drives that have the same rotational speed. 
    • The data devices in the pool should generally be spread across as many DAs and drives of a given speed as possible. 
    • The devices should be evenly spread across the DAs and drives. 
    • The wide striping provided by Virtual Provisioning will spread thin devices evenly across the data devices. The storage administrator must ensure that the data devices are evenly spread across the back end. 
    • It is recommended that all data devices in a pool are of the same size. Using different size devices could result in uneven data distribution. 
    • The data device sizes should be as large as possible to minimize the number of devices required to encompass the desired overall pool capacity.

Data Center Management Interview Questions

19. 19. What Are The Vmax Storage Optimization Features?

    Dynamic Cache Partitioning:
     

    Allows the allocation of portions of cache to specific device groups.

    Symmetrix Priority Controls:
     

    Allows the prioritization of read I/O and SRDF/S transfers by host applications. 

    Symmetrix Optimizer:
     

    Optimizes performance by monitoring access patterns on storage arrays and transparently moving data between storage tiers. 

    Virtual LUN:
     

    Allows the movement of data between storage tiers. 

    Fully Automated Storage Tiering (FAST):
     

    provides sophisticated background algorithms that can automate the allocation and relocation of data across storage tiers based on the changing performance of applications. 

    Storage provisioning with symaccess allows you to create a group of devices, a group of director ports, a group of host initiators, and with one command, associate them in what is called a masking view. Once a masking view exists, devices, ports, and initiators can be easily added or removed from their respective groups.

20. 20. Can You Explain The Step By Step Procedure For Creating Auto Provisioning Groups?

    The steps for creating a masking view are: 

    1. Search the environment for Symmetrix devices on each HBA 
    2. Symaccess discover hba
    3. Create a storage group (one or more devices) 
    4. Symaccess -sid XXXX create -name StorageGroupName -type storage devs 3250:3350 
    5. Create a port group (one or more director/port combinations) 
    6. Symaccess -sid XXXX create -name PortGroupName -type port -dirport 7E:0,7G:1,8F:0 
    7. Create an initiator group (one or more host WWNs or iSCSIs) 
    8. symaccess -sid XXXX create -name InitiatorGroupName -type initiator -wwn wwn 
    9. Create a masking view containing the storage group, port group, and initiator group. 
    10. When a masking view is created, the devices are automatically masked and mapped. 
    11. symaccess -sid XXXX create view -name MaskingViewName -sg StorageGroupName -pg PortGroupName -ig InitiatorGroupName.

Data center infrastructure management (DCIM) Interview Questions

21. 21. What Is Purpose Fast (fully Automated Storage Tiering)?

    FAST is Symmetrix software that runs background algorithms continuously analyze the utilization (busy rate) of the Symmetrix array devices. 

    FAST can move the most-used data to the fastest storage, such as Enterprise Flash Drives, the least-used data to the slowest storage, such as SATA drives, while maintaining the remaining data on Fibre Channel drives, based on user-defined Symmetrix tiers and FAST policies. 

    The objective of tiered storage is to minimize the cost of storage by putting the right data, on the right Symmetrix tier, at the right time.

22. 22. How Do You Configure The Symmetrix Array For Fast?

    • By defining symmetrix tiers 
    • By defining FAST Policies 
    • By defining storage groups

1. How Can You Define A New Ember Class?

You can use call the extend () method on Ember. Object to define a new ember class.

2. Explain Application Template?

Application Template is a default template that is used when your application starts.

3. Explain How You Can Create An Ember. Handlebars Template?

Call Ember.Handlebars.Compile() to create an ember. Handlebars template. It will return a function which can be used by ember. view for rendering.

4. What Are Services In Ember.js?

It is a long-lived Ember object that can be made available in different parts of your application. It is created using the following syntax- “ember. Service”

Example uses of Ember.js services include:

• Logging
• User/session authentication
• Geolocation
• Third-party API’s
• Web Sockets
• Server sent events or notifications
• Server-backed API calls that may not fit ember-data.

Services are generated with the help of ember CLI service generator. If you want to access a service, inject it either in an initializers or use the following syntax- “ember. Inject”. Using this you can even access the properties and methods using services. Use the following syntax to define a service:

Syntax
– ember generate service service _name;

5. What Do You Mean By Serializer In Ember.js And What Role Does It Play While Writing A Code?

It is useful when it comes to using a JavaScript Object Notion. Actually, it returns payload from the server into a machine from where it is easy for the users to read it. A very large number of attributes can be represented in a very simple manner and the good thing is there is a well-defined relation between them. With this relation, it is possible for the users to have many different ways to understand and eliminate the bugs from the code.

6. What Do You Know About The Application Template?

When any application starts, this is the default template from where it is operated. Users need to put a Header, footer and any other decorative item that is required to be displayed on the page.

7. How The Data Can Be Added Using Fixture Into An Application?

For doing anything, it is always good to check the procedure with a sample data. This is because the task is sensitive and needs a lot of care for the accomplishment. This can be done with the help of long-term persistence fixtures. However, it is necessary that applications must be connected with each other. The application adapter is to be made the extension of Ds.Fixture. For communication purpose, the adapters can be deployed easily. At the last, the file is to be updated to the model todo.js

8. What Are The Template Components In Ember.js You Are Familiar With? Is There Any Similarity Among Them?

There are certain template components that are extremely powerful in Ember.js and are used for various purposes related to running the code in an error-free manner.

These include: 

• View
• Outlet
• Render
• Partial
• Yield

They are similar in one aspect and i.e.  They can be called in all the programs with similar functions.

9. What Is Ember.mixin Class?

Ember.mixin class can create objects, whose functions and properties can be shared among other instances and classes.

10. Are Router And Route In Ember.js Different Terms? If So, How?

Yes, these are different terms. Router is basically a medium that connects the application with browser’s address. It is possible to translate the address into route simply. Because it only acts as a channel, it always makes sure of accuracy. On the other side, Route is a location where the request of a user reaches first after it is made or translated by a Router. It’s nothing but the Route who is responsible for defining the data that is to be sent to the Template.

11. What Are Observers In Ember.js?

Ember supports observing any property which also includes computed properties. Observers are something which contains the behavior that reacts to the changes made in other properties. Observers are used when we need to perform some behavior after a binding has finished synchronizing. New ember developers often use observers. Observers are mostly used within the ember framework and for that; computed properties are the appropriate solution. An observer can be set on an object using the following syntax- “ember. Observer” Observers in ember are synchronous. They will fire as soon as they observe a change in of the properties. And, because of this, it is easy to introduce bugs where properties are not yet synchronized.

12. What Are The Features Of Emberjs?

• • • Creating reusable modules.
    • Handlebars Templates.
    • Automatic determines the route and controller during declaration of the route resources.
    • Used routes.
    • Extensive view type support.
    • Easy to configure.

13. What Are The Prime Tasks That Are Performed By Controllers In Ember.js?

Decorating the model which is returned by the route is a very essential task that needs to be performed in the Ember.js. The same is handled by Controllers. It is not always necessary that only a single controller perform s this task but depending on the task itself, there can be need of multiple controllers. In addition to this, there are a lot of actions which users perform; Listening to them is also the responsibility of the controllers.

14. What Is Ember Route? How Can You Generate A Route In Ember.js?

An ember route is built with three parts:

• An entry in the Ember router which maps between our route name and a specific URI.
• A route handler file, which sets up what should happen when that route is loaded.
• A route template, which is where we display the actual content for the page.

In ember when we want to make a new page that can be visited using a URL, we need to generate a “route” using Ember CLI. Hence the generator will print out:

• Installing route
• Create app/routes/about.hbs
• Create app/templates/about.hbs
• Updating router
• Add route about
• Installing route test

To define a route, run ember generates route route-name. This command will generate a file name route-name.js in app/routes/ folder.

15. Explain The Core Concept Of Emberjs?

Store:
It is central repository and cache of all records available in an application. It can be accessed by controller and admin.

Models:
A model is a class which defines the data of properties and behavior.

Records:
A record is an instance of a model which contains information that is loaded from a server.

Adapter:
It is responsible for translating requested records into the appropriate calls t.

Serializer:
Translating JSON data into a record object.

Automatic Caching: Used for caching.

16. What Are Basic Models Of Emberjs?

Routes:
State of application is represented by URL and each URL has a corresponding route object that.

Models:
Use to load data from Server.

Templates:
This is html of layout.

Components:
It is custom tag.

Services:
Services are just singleton objects to hold long-lived data such as user sessions.

17. What Are The Main Components Of V You Are Familiar With?

There are several components of Ember.js that play a significant role in making it best in every aspect.

These are:

• • • Routers
    • Templates
    • Views
    • Models
    • Components
    • Controllers
    • Helpers
    • Suffix

18. Explain Directory Structure In Ember.js?

The new command generates a project structure also called directory structure with the following files and directories:

I-app:
– This is where folders and files for models, components, routes, templates, and styles are stored.

I-bower components/ bower.json:
– Bower is a dependency management tool which is used in Ember CLI to manage front-end plugins and component dependencies.

I-config:
– The config directory contains the environment.js where we can configure settings for your app.

I-dist:
-When we build our app for deployment, the output files will be created here.

I-node_modules/package.json:
– Directory and files are from npm. Npm is the package manager for node.js.

Public:
– This directory contains assets such as image and fonts.

Vendor:
– This directory is where front-end dependencies that are not managed by Bower go.

Tests/testem.js:
– Automated tests for our app go in the test folder, and testem is configured in testem.js.

Tmp:
– Ember CLI temporary files live here.

Ember-cli-build.js:
– This file describes how Ember CLI should build our app.

19. What Is Npm Install?

NPM is a NodeJS package manager. It is used to install the node programs.

20. What Is Emberjs?

It is javascript framework based on Model-view-controller (MVC) and written in javascript. It allows developers to create scalable single-page web applications by incorporating common idioms.

In this, Route is used as model; template as view and controller manipulates the data in the model.

21. What Exactly Do You Know About Ember.js?

Ember.js is a JavaScript web framework that is open-source in nature and is one of the best options available when it comes to building single page web applications. Standard application architecture can simply be assured from Ember.js. The good thing is it develops applications that are best in running in the browser.