EMC ClARiiON SAN array introduction video tutorial more indepth videos to come soon

More in depth videos about SAN arrays from both EMC & Network Appliance will be posted soon.

Keep reading this blog & email roger.smithson @ gmail.com for feedback

These videos are produced by a reader & I encourage others to contribute as well.

IT jobs or Software Jobs or Storage Jobs : You will find All of them here

This blog has information including Tutorials,Interview Procedure,Interview process, Interview questions, Videos, Job Openings. For those interested below are some of the previous tech posts. Email roger.smithson@gmail.com for feedback & FREE Storage Tutorial Guide

1.Storage Customers: Challenge : Solution

2.HA or High Availability

3.Storage area networking Sample Implementation Images

4.SAN Implementation Sample images for Reference

5.Storage Jobs Guide for Winning Interviews

6.Storage architecture

7.Fibre Channel Network Architecture

8.What is iSCSI

9.iSCSI Storage Solutions

10.iSCSI Storage implementation

11.Virtualization in Storage

12.Storage jobs Videos

13.Storage companies products Videos & Tutorials

14.IBM Server Grid Videos for your Reference

15.Storage Consolidation Explained with Example Images

16.StorEdge Sun microsystems

17.EMC Symmetrix

18.How To Setup Storage Lab : Simple & Cheap

19.Videos on building a Storage infrastructure

20.Data Centre Video Collections

21.Data Centre What are they made up of:Virtual Tour

22.Building Data Centers

23.How will be a Company's Network Infrastructure

24.See Inside a Data Center

25.Cisco Data Center Infrastructure

26.Cisco Switches

27.Storage Technology jobs : A high Paying Career

28.Certification in Storage

29.Information Lifecycle Management

Answer these questions and Get Job Interview

Answer below questions in an email to roger.smithson@gmail.com(I will publish your answers on this blog) and I will help You Get a Job Interview. I will do all the tricks & necessary things to get you a Job Interview from a company of your interest.You will also get lots of necessary materials for your Intervew.
So email your answers for below questions. I just want to publish people's experiences related to their Software Job or Storage technology job hunting on this blog hence I am giving this offer.

0. What is your Present Job Designation & Area of expertise ?

1. What are the responsibilities you are given in this present Job

2. Describe how will be your regular week day, what are the tasks you do

3. What are your Career plans

4. How did you get this Job

5. How was your Interview for this Job

6.Can you tell some of your Interview Questions

7. How many interviews you attended & if its ok can u mention the company names & Job roles

8. What is your present salary now

9. Can you describe any challenging tasks/troubleshooting you have done recently. If you can write with steps,commands that will be great

10. How would you plan to start your interview preparation for next job if you are interested?

11. What are the job roles you are aiming for

12. What is the salary you are expecting in your next job?

13. What you think you will be required in terms of guidance to reach a Better Career.


14. What are some of the good links you liked on this Storage Jobs Blog

15. What is your Suggestion for someone who is searching for a Job

How To Get Job Interview in Software or Storage Technology

If you have been searching for a Job in IT and struggling to get Interviews, You should read this article. There are many more tips through out this blog which will be a big boost to increase your chance of NOT just getting interviews but also Winning the JOB offer letter.

Few things which make you get Interviews FAST
1. If You Have Your Resume Hosted on some of the major Job Portals AND
2. If your skillsets are very much in demand by many IT/Software/Storage Companies AND
3. If you have properly written your RESUME or CV highlighting what the Companies are looking for AND
4. If you have good working experience on the skills required

All above conditions look very unreasonable for many. Many of my blog readers are not Software Professionals having years of experience in Software or Storage field. Many do not have great skillset or a Resume to showcase them.

So being such a common job hunter how can I get Job Interviews ?

Answer:
1. If I Help You Will You Work Hard To Prepare Dedicatedly for Interviews ?
2. If there is guidance in emails coming everyday will you be serious enough to follow them so you can reach your Career Goals.
3. Would you be willing to work extra hours to get Results fast.
4. Would you develop your mindset to put extra efforts,hard work,focussed learning to reap the benefits and to find your true potential.

If you can do all the above then I can help You or May be You DONT need any more help. Email me roger.smithson@gmail.com but I would definitely ask you to work hard. I dont believe in short cuts. If you are willing to work hard only then you email else I am really sorry. Keep reading the remaining posts on this blog to get many Interview questions and answers. Also you can find many interview experiences, Job openings. May be you will get some interview some day ? May God Bless You with all the things you Dream for

I want you to be Happy and I want to help

This is a very special blogpost
This is not a tech post - This is more of a personal post.
Through this post I want to THANK all the people

- Who share knowledge with me & this blog
- Who show that they care for others
- Who prove that its not always gain that man has on his mind
- Who support you & help you build a better life & Career.
- Who email me

I want to thank all these nice people who showed that they Care,Thanks a lot
- Sean Ray ( For inspiring & motivating me to keep working on this blog )
- Jaiku P ( For sending more than 80 interview questions on Storage with answers to many questions - I really appreciate your efforts )
- Vijay AR (For sharing so many nice tech books & constantly emailing)
- Ashish Pathak (For sharing interview questions on the most wanted - Veritas Volume Manager )
- Sarfaraz M( For all the emails & nice ideas you shared)
- Yogesh Sobale ( For all the encouragement & enthusiasm you showed)
- A R Rahman ( For interview questions on Fibre Channel )
- Naveen Sangagl ( For all the chat sessions & Support )
- Unni Krishnan ( For your support & friendship )
- Toufeeq abdula ( For all the constant emails & support )

Thanks again to all the nice people who wrote in the comments sections
and most of all THANKS A LOT to the visitors of this blog who are taking time to read & appreciate this blog. DO CONTRIBUTE & SHARE YOUR KNOWLEDGE.

I wish this list of people keeps increasing .This blog's wealth of knowledge is due to contribution of all these people - I want you all to appreciate their support.

Storage area networking Interview Questions

PREVIOUS POSTS CAN BE FOUND BY CLICKING THIS LINK
EMAIL roger.smithson@gmail.com for FREE EASY to understand SAN Student Guide PDF tutorial

Some more interview questions contributed by Jai
51) What is one of the constrains of using storage switch?
Latency

52) What is the difference between NAS and SAN?

NAS
Cables used in the n/w
n/w protocols (TCP/IP, IPx) and file sharing protocols (IFS & NFS)
Lower TCO
Support heterogeneous clients
Slow

SAN
High-speed connectivity such as FC
Do not use n/w protocols because data request are not made over LAN
Higher TCO
Requires special s/w to provide access to heterogeneous clients
Fast

53) What is Jitter?
Jitter refers to any deviation in timing that a bit stream suffers as it traverses the physical medium and the circuitry on-board the end devices. A certain amount of deviation from the original signaling will occur naturally as serial bit stream propagates over fibre-optic or copper cabling.

Mainly caused by electro magnetic interference

54) What is BER/Bit error rate?
Probability that a transmitted bit will be erroneously received is the measure of number of bits (erroneous) at the output of the receiver and dividing by the total number of bits in transmission.

55) What is WWPN?
WWPN is the 16bit character that is assigned to the port, SAN volume controller uses it to uniquely identify the fibre channel HBA that is installed in the host system.

56) What is connection allegiance?
Given multiple connections are established, individual command/response pair must flow over the same connection. This connection allegiance ensures that specific read or writes commands are fulfilled without the additional overhead of monitoring multiple connections and to see whether a particular request is completed.

57) What is burst Length?
The burst length is the number of bytes that the SCSI initiator sends to the SCSI target in the FCP_DATA sequence.

58) Explain different types of RAID?
RAID 0: data striping blocks are written sequentially, no redundancy, high performance than single disk access.

RAID 1: Mirroring, data blocks written to both disk at once, 100% redundancy, 100% additional capacity required. Read can be distributed across both the disks to increase performance.

RAID 3: Striping with byte parity, adds parity information to rebuild data in the event of disk failure, high transfer rate and availability with lower capacity required than RAID 1. Transactions performance low because all disks operate in lock step.

RAID 4: striping with block parity, independently accessible disks, data blocks written sequentially to each disk failure. Dedicated parity disk is write bottleneck and leads to poor performance.

RAID 5: Striping with rotational parity, parity blocks written per row and distributed across all disks, parity distribution eliminates single write bottleneck overhead for parity calculation on write supplemented with parallel microprocessors or caching.

59) What is NAS in detail ?
NAS or Network Attached Storage
“NAS is used to refer to storage elements that connect to a network and provide file
access services to computer systems. Abbreviated NAS. A NAS Storage Element consists of an interface or engine, which implements the file services, and one or more devices, on which data is stored.
NAS elements may be attached to any type of network. When attached to SANs, NAS elements may be considered to be members of the SAS (SAN Attached Storage) class of storage elements.

A class of systems that provide file services to host computers. A host system that uses network attached storage uses a file system device driver to access data using file access protocols such as NFS or CIFS. NAS systems interpret these commands and perform the internal file and device I/O operations necessary to execute them.”

Though the NAS does speed up bulk transfers, it does not offload the LAN like a SAN does. Most storage devices cannot just plug into gigabit Ethernet and be shared - this requires a specialized file server the variety of supported devices is more limited.NAS has various protocols established for such needed features as discovery, access control, and name services.

60)Briefly list the advantages of SAN ?
SANs fully exploit high-performance, highconnectivity network technologies
SANs expand easily to keep pace with fast growing storage needs
SANs allow any server to access any data
SANs help centralize management of storage resources
SANs reduce total cost of ownership (TCO)

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