Can You Restore Your Data From Your Backup?

Written by Per Strandberg

Continued from page 1

The problem you face is that in order to restore all your hard disk data you need to haverepparttar same or a similar configuration for everything to work out as before. Mayberepparttar 107766 operating system you used is not available anymore or hard to find.

In any case you probably wantrepparttar 107767 newest and latest version.

This is where you have problems!

You can installrepparttar 107768 old operating system if you haverepparttar 107769 installation CDs available.

When you installrepparttar 107770 backup program and installrepparttar 107771 data fromrepparttar 107772 backup you can run into problem. If it is a new operating system then you do run into problem.

This is because program modules and also settings stored inrepparttar 107773 registration file becomes mixed up andrepparttar 107774 computer stops working.

It is often not enough to userepparttar 107775 same Windows version in repparttar 107776 installation. Your backup you can still have a different version as a result of different bug fixes. This is what Microsoft calls Service Packs and your deep level data can get mixed up.

As a result you may be losing software you have installed fromrepparttar 107777 Internet or bought from a supplier and you have to purchaserepparttar 107778 products again.

There are two actions to take to solve this depending on how important this is to your business.

One: You find thatrepparttar 107779 products you have downloaded or repparttar 107780 application products you have bought are not of high enough value. Or you can afford to purchase repparttar 107781 software again.

Two: You keep record of all software you have downloaded and purchased onrepparttar 107782 Internet so that you can contactrepparttar 107783 vendor for a new version.

You store all installation product and documentation so that you can installrepparttar 107784 products fromrepparttar 107785 installation CD you have purchased over time.

To be onrepparttar 107786 safe side you should:

1. Make regular computer backup ofrepparttar 107787 data you are working with on a daily basis and haverepparttar 107788 computer backup stored on a safe place. Preferably on a remote location.

2. Do make an image backup of your hard disk when you have installed new software. This ensures that you can be back in business inrepparttar 107789 case of corrupted hard disk or hard disk failure.

3. Document all your purchases and passwords. Keep records and store all software installations. Keep all this at a remote location.

============================================================ Per Strandberg have been working with data management and runs an information site for backup products and data security! GoTo ==> and get information on backup products and learn how to protect your data ============================================================

Per Strandberg have been working with data management and software development. He currently runs an information site on backup products and data security!

Different RAID Levels

Written by Ronald Merts

Continued from page 1
RAID Level 3 This RAID level is really an adaptation of RAID Level 0 that sacrifices some capacity, forrepparttar same number of drives, but achieves a high level of data integrity or fault tolerance. It takes advantage of RAID Level 0's data striping methods, except that data is striped across all but one ofrepparttar 107765 drives inrepparttar 107766 array. This drive is used to store parity information that is used to maintain data integrity across all drives inrepparttar 107767 subsystem. The parity drive itself is divided up into stripes, and each parity drive stripe is used to store parity information forrepparttar 107768 corresponding data stripes dispersed throughoutrepparttar 107769 array. This method achieves very high data transfer performance by reading from or writing to all ofrepparttar 107770 drives in parallel or simultaneously but retainsrepparttar 107771 means to reconstruct data if a given drive fails, maintaining data integrity forrepparttar 107772 system. RAID Level 3 is an excellent configuration for moving very large sequential files in a timely manner. The stripes of parity information stored onrepparttar 107773 dedicated drive are calculated using an "Exclusive OR" function, which is a logical function betweenrepparttar 107774 two series that carries most ofrepparttar 107775 same attributes asrepparttar 107776 conventional OR function. The difference occurs whenrepparttar 107777 two bits inrepparttar 107778 function are both non-zero: in Exclusive OR,repparttar 107779 result ofrepparttar 107780 function is zero, wherein with conventional OR it would be one. RAID Level 4 RAID Level 4 is similar in concept to RAID Level 3, but emphasizes performance for different applications, e.g. Database TP versus large sequential files. Another difference betweenrepparttar 107781 two is that RAID Level 4 has a larger stripe depth, usually of two blocks, which allowsrepparttar 107782 RAID management software to operaterepparttar 107783 disks much more independently than RAID Level 3. This essentially replacesrepparttar 107784 high data throughput capability of RAID Level 3 with faster data access in read-intensive applications. A shortcoming of RAID level 4 is rooted in an inherent bottleneck onrepparttar 107785 parity drive. As data gets written torepparttar 107786 array,repparttar 107787 parity encoding scheme tends to be more tedious in write activities than with other RAID topologies. This more or less relegates RAID Level 4 to read-intensive applications with little need for similar write performance. As a consequence, like its Level 3, it doesn't see much common use in commercial applications. RAID Level 5 This isrepparttar 107788 last ofrepparttar 107789 most common RAID levels in use, and is probablyrepparttar 107790 most frequently implemented. RAID Level 5 minimizesrepparttar 107791 write bottlenecks of RAID Level 4 by distributing parity stripes over a series of hard drives. In doing so it provides relief torepparttar 107792 concentration of write activity on a single drive, which in turn enhances overall system performance. The way RAID Level 5 reduces parity write bottlenecks is relatively simple. Instead of allowing any one drive inrepparttar 107793 array to assumerepparttar 107794 risk of a bottleneck, all ofrepparttar 107795 drives inrepparttar 107796 array assume write activity responsibilities. The distribution frees uprepparttar 107797 concentration on a single drive, improving overall subsystem throughput. RAID Level 5's parity encoding scheme isrepparttar 107798 same as Levels 3 and 4; it maintainsrepparttar 107799 system's ability to recover any lost data should a single drive fail. This can happen as long as no parity stripe on an individual drive storesrepparttar 107800 information of a data stripe onrepparttar 107801 same drive. In other words,repparttar 107802 parity information for any data stripe must always be located on a drive other thanrepparttar 107803 one on whichrepparttar 107804 data resides.

CIO/Sr. Vice President for Tornado Computers in Oklahoma City, OK. Located at

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