Computer security has an important role in one's life of computers. This subject should not be taken lightly. Everytime you go online your system is tested. Below I have given you some good tips for your computer life. 1. New Computer When buying a new computer, it is important for you to turn the firewall on. The firewall will not protect you all the way but somewhat. Its better than nothing. 2. Email Attachments in unknown emails are usually a threat. Never open any attachment from an unknown email. Sometimes, the email subject said something about you getting a greeting card and ask you to click the link inside that email. These emails can contain anything from viruses or spyware. If the link inside that email is something like an ip address (http://aaa.bbb.x.y/) instead of a domain name, never click it. 3. Update Your Virus Definition Installing an antivirus will not be enough. Constant update is needed so you can receive new virus definition. New threats are being created everyday and updating your virus definition on regular basis is crucial to detect newer threats. 4. Don't Surf Suspicious Sites Opening a porn site will also increase your risk of getting a virus. Application such as cracks and patches from sites will also increase your risk. Using these tips will decrease the risk of getting your private information stolen by an outsider. However, these tips are not enough to protect your computer as this is only a basic computer security tips. Learn more. http://computertips-rick.blogspot.com/
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Sunday, November 4, 2007
Computer security and other
Network storage devices
The need for storage devices is growing by leaps and bounds. In addition there are a number of options available depending on specific storage requirements. There are numerous options available with SAN. The two most popular variants are Fibre channel (FC) and Internet Protocol (IP). In a FC SAN the disc arrays are connected using fibre channel connections. An FC switch acts as the central point of control for data flowing through the SAN. Hence, FC or IP depends upon the application. If the data is critical, Fibre Channel is a better option. A low cost SAN is an integrated package that includes an FC switch, high-performance software and disc storage that can be hooked up to two servers.
An IP SAN uses the internet small Computer System Interface iSCSI protocol and Gigabit Ethernet over Cat 6 cabling to hook up disc arrays over a Transmission control protocol / Internet protocol (TCP/IP) network. These SANs provide native-level block access and data transfer and are similar in this respect to traditional FC SANs. Essentially a customer data centre requires various transport technologies that enable long distance connectivity in a cost effective manner. Fiber Channel is better for high speed connectivity and applications such as ERP and databases. For a small organization IP SAN would suffice. A judicious mix of both IP and Fiber Channel is required to balance cost and efficiency of storage systems and devices.
NAS and SAN
NAS is a data storage mechanism where the storage devices are connected directly to the network. These devices are assigned an IP address and then can be accessed by clients via a server that acts as a gateway to the data or in some cases allows the device to be accessed directly by the clients without any intermediary. Easy manageability is a important feature of NAS. It is focused on simple file serving needs. NAS and SAN are complimentary to each other. The trend is towards hybrid solutions. SAN can be used as a back end and NAS as the front end ie having a NAS header in a SAN environment.
Large organizations with enterprise networks and a wide geographical spread are opting for SAN whereas small and medium businesses find NAS a better option. In SAN there is a movement towards IP because one can use the same protocol as the network leading to a lesser cost of implementation.
Growth in chassis –based SAN switches is faster than in the fabric switch segment because of SAN and storage consolidation and linking of first generation SAN islands. Also ,the need to implement SAN extension solutions for data replication and business continuity is driving the need for intelligent multilayer SAN switches and related products.
Ultimately the choice between San or NAS depends on a number of factors. The cost of implementation, ease of maintenance, fault tolerance and security are some of the aspects which have to be considered while adapting a particular storage system. It is also possible to have a hybrid system with both SAN and NAS being used simultaneously. . One fit all is no longer feasible and the trend is towards a mixed bag of options.
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Saturday, November 3, 2007
Computer registry
Trying to fix a computer registry problem can be a real pain to deal with. Im going to show you a few simple steps you can try to fix your problem, if all else fails I have a surefire way I can tell you about later. Lets get started; here are a few things you need to consider when fixing your registry problem.
-First, take a look back and try to remember when the problem started. Was it a site you visited or did you just turn on your pc one day and the problem was there?
-Second, you need to realize that there are some people out there who like to wreck people's computers for fun. I know it sounds pretty messed up but we are mainly talking about teenagers here who are trying to impress there friends. You need to also realize kids are smart today when it comes to computer technology; they have made it where they have all corners covered. This is a problem for you, because even methods that should work do not.
How can I fix this registry problem on my computer?
Your best bet would be to simply reinstall your windows operating system and see if that clears the problem. In all reality this will probably not work, but it works in a very small percentage of cases. You also need to be prepared to lose all your data on your computer unless you back it up. You could find some great software that will take care of your problem also; you can actually check my blog in the link below for a surefire fix if nothing else works for you. I hope you found this article helpful, and I hope you fix your computer registry.
Corey is a self proclaimed Computer expert. You can do a registry repair scan at http://registryrepaircenter.blogspot.com and Fix Your Computers Registry now!
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Recover Your Data
Recent technology in the field of online computer backups has made data center disaster recovery plans a breeze.
In the old days (think before 2005), data center disaster recovery plans were only marginally effective. Data had to be stored on CD's, in folders, on zip disks (remember those?), and on backup computers. Many businesses didn't bother to backup data to a separate location at all.
The major flaw with backing up to "the backup computer" has always been an issue of security. Most backup computers are connected to a network in the office, which allows for easy data transfer. Certain threats, like system bugs or viruses, to any of the computers on the network then become threats to all the computers on the network. Clearly, this plan does not represent a secure data backup system.
Advances in technology have addressed these issues. Many computer backup systems now feature online computer backups, and businesses are now able to store their data online, keeping their data centers secure and safe from viruses and system bugs.
Online computer backup systems can add additional security to important data with the use of password systems that restrict access to the data. This type of security extends data protection to address hackers and unauthorized personnel.
Online computer backups also save space at the office. Typically, more data can be stored online than in any folder, CD or even backup computer. This translates to increases in work efficiency and production.
Businesses small and large are now better equipped to deal with any disaster, because all the important data is stored remotely, in a central location, which makes for much more efficient data center disaster recovery plans.
No matter what catastrophe hits, online computer backups have these businesses covered. Business owners can be assured that whether a file got corrupted or a full system crash occurred, their data has remained safe.
Realize, however, that when choosing a computer backup system with an online backup system, it is advisable to make sure that it can deliver the goods. If it can, then you have probably found a data center disaster recovery plan that will maximize your disaster coverage.
A good computer backup system with online computer backup can prevent the untimely death of your business. Click here to find out more about data center disaster recovery plans. Go to: http://hk-data-center-disaster-recovery-plan.blogspot.com/
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A PHP cache
If you look at a PHP source file you will notice one thing. It's a source file. Not particularly surprising, but think about when you deploy a PHP application, what do you deploy? PHP source files. Now for many other languages; Java, C, etc when you deploy an application you deploy the compiled file. So, the question that you want to ask yourself is this, how much time does a PHP application spend compiling source files vs running the code? I'll answer that for you, a lot.
There are advantages to being able to deploy source files though. It makes it easy to do on the fly modifications or bug fixes to a program, much like we used to do in the early BASIC languages. Just change the file and the next time it's accessed your change is reflected. So, how do we keep the dynamic nature of PHP, but not recompile our files every time they are accessed?
A PHP cache. It's surprising to me that this concept isn't built into the base PHP engine, but perhaps that's because some company's can sell this add on to speed up PHP. Luckily for us, some companies/open source projects provide this plug in to PHP at no charge. These plug ins are generally known as PHP accelerators, some of them do some optimization and then caching and some only do caching. I'm not going to pass judgement on which one is the best, any of them are better than nothing, but I decided to use APC, the Alternative PHP Cache. I chose this one because it is still in active development and is open source and free.
Alternative php cache can be found at php.net, just look down the left column for APC. It comes in source form, so you will need to compile it before installing it, don't worry about that part. If you're using Red Hat 4 or CentOS4 I'll tell you exactly how to do it. If you're using something else, you'll need the same tools, but getting the tools might be a bit different.
1. The Tools
Do you know how many web sites, forums and blogs I went to with my error messages before I found the answers as to what I was missing when I was trying to install APC - Alternative PHP Cache? Two days worth, but I finally found the correct combination and it's really quite obvious as is everything once you know the answer. There are three sets of dev tools that you will need.
1a. You'll need a package called "Development Tools" this will include all the important dev tools like the GCC compiler, etc.
1b. You'll need a package called php-devel which as you might guess are development tools for PHP
1c. You'll need a package called httpd-devel which of course are dev tools for Apache web server.
On Red Hat or CentOS getting these should be as easy as the following 3 commands:
yum groupinstall "Development Tools"
yum install php-devel
yum install httpd-devel
You'll do these three one at a time and follow any instructions (usually just saying yes).
Now it's time to follow the instructions contained in the APC package. Since these may change over time I'm not going to go through them. They are very complete. If you follow the instructions and get an apc.so file out of it, then you're all set, just modify your php.ini file and you're good to go.
There are two problems that I encountered that you may encounter too. The first is an error when running phpize. I ignored this error and everything succeeded okay, but not before I spent hours looking for the solution to this error. Here is the error.
configure.in:9: warning: underquoted definition of PHP_WITH_PHP_CONFIG
run info '(automake)Extending aclocal'
or see http://sources.redhat.com/automake/automake.html#Extending-aclocal
configure.in:32: warning: underquoted definition of PHP_EXT_BUILDDIR
configure.in:33: warning: underquoted definition of PHP_EXT_DIR
configure.in:34: warning: underquoted definition of PHP_EXT_SRCDIR
configure.in:35: warning: underquoted definition of PHP_ALWAYS_SHARED
acinclude.m4:19: warning: underquoted definition of PHP_PROG_RE2C
People would have had me updating my PHP version from 4.3.9 and everything else under the sun to get rid of this error, but in the end it didn't matter. My APC compiled and installed nicely and I am good to go.
The other slight problem that I ran into was the location of php-config. The install instructions wanted me to do the following:
./configure --enable-apc-mmap --with-apxs
--with-php-config=/usr/local/php/bin/php-config
However my php-config is in /usr/bin/php-config. Making that change allowed this part to work.
So, have at it, once it's done you can expect to see huge improvements in your web site response times and reductions on your CPU load. One more quick note, My server hosts about 20 web sites, but only 3 or 4 are really busy. To reduce the memory footprint of caching everything for all 20 sites I used the apc.filters property. Although this property is slightly flawed for non qualified includes, it worked nicely for my Serendipity blogs. Your mileage with this property will vary according to the software you are using and how it does it's includes.
Jon runs UFC fan site UFC Results come to UFC Results at http://www.ufcresultslive.com for UFC Results, Predictions, News and of course Fighter Rankings.
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