After talk about special character on linux command last week, now let understand on disk quota here. In Linux, a system of disk quotas enables the system administrator to restrict disk usage by individuals and groups.

Quotas can specify

• the maximum amount of total disk space allotted to a user or group
• The maximum number of files a user or group can create

You assign quotas by partition, so an individual or group who creates files on two partitions may have a different quota for each partition, or a quota for only one of the two partitions.

User and group quotas
User quotas and group quotas are independent of each other – so the value of the group quota is not the sum of the values of the users’ quotas in a group. When a user attempts to create a file, Linux first checks if there is a group quota for the user’s group. If a group quota for the group to which the user belongs has already been filled, the user can’t create the file, regardless of the status of the user’s quota. To create the file, the user must change groups. Every file that an individual user creates counts towards the quota of the user’s group. If the user isn’t part of a quota-restricted group, or if group quotas aren’t switched on for a partition, the user can create files on the partition as long as the user’s quota isn’t filled. (more…)

Posted by calvyn | 1 Comment »

It has been long time I not really sit down and blog about my life… I just prepare some nice article and post at my blog time to time, such as networking (basic networking term) and some linux related article too.

Two week ago Wawasan University organize their carnival, and CIMB bank organize cashflow board game at there. It is the 1st time I experience my self from real cashflow board game. The game was nice, different feeling compare with the cash flow egame.

But I still prefer e-game . It won’t goes mistaken when do the calculation on the statement. For this cash flow financial game, it have 2 version, one is  cashflow 101, and cashflow 202. In my opinion, Cashflow 101 are very easy to play, while Cashflow 202 are a bit hard because the share market keep on going up and down all the time. While bad luck you get an opportunities in the wrong time, you will loss if you sell the share.

Let see some screen shoot on Cashflow 202 Egame (more…)

Posted by calvyn | 14 Comments »

Many computer users focus on the technologies that operate within a single Local Area Network (LAN). Of course, there must be a way for data to be transferred between LANs, so as to create the network of computer networks that is the Internet. A router is the key piece of hardware in the Internet, as it acts – strictly – as an interface between two computer networks.

A router

Routers allow data to be transferred or routed between networks. They can do this in the most efficient way possible, to networks far removed from the LAN in which the data originated. When using the Transmission Control Protocol/Internet Protocol (TCP/IP), routers use IP addresses to determine the path to a destination. Devices such as switches and bridges, on the other hand, use media access control (MAC) addresses to determine the correct path to a destination. A router is known as a stateless device because it handles the destination address of the data that it routes rather than the data itself. (more…)

Posted by calvyn | 2 Comments »

Windows Registry is configuration data for Microsoft Windows operating system. This registry record is created to hold important information for our computer. If you are not familiar with how an operating system works, you probably won’t realize about these data. But, you will definitely experience or feel the impact of it before, especially when it goes wrong.

After a period of time, when you start feeling your pc getting slower, always getting errors like DLL issue, Windows explorer error, Windows installer issues, Internet Explorer errors, System32 errors, Runtime errors, Svchost errors or even more serious is, your monitor screen turn into blue color. This is the moment where the system is telling you, you need to clean your computer registry.

Make Computer Faster
Cleaning computer registry will help to speed up your computer. When you clean the computer registry, you will remove configuration data from Windows Registry that is no longer in use or unnecessary to the system. Besides, you will also clean all junk files and free up you computer hard disk. (more…)

Posted by calvyn | 5 Comments »

Do you install security application at your computer? no budget to purchase can get a free application.

Security is once of the main concern when you use your computer to access important website, such as checking your banking account, login your paypal account, checking email, government related website and so on.

All this security take higher concern when you using public wireless to access. But in my opinion, it is not recommended to

access this kind of website when using public wifi service. If you really want, remember to install more security software. Here is the list of FREE security application that you might need to secure your computer.

Spybot

More and more malware such as keystroke logger which use by hacker to steal your password while you login into your bank account or during you check your email. Trojan horse also one of the spyware that take over your control on your computer surreptitiously. To prevent all this malware to be install into your PC, Spybot will take over the role to prevent it happen and provide real time registry monitoring feature too.

www.safer-networking.org

Avira

This antivirus always let me recall the movie call “resident evil”, may be because the logo for avira antivirus is a umbrella. The Avira antivirus running at the operation system background with not strain much computer resources. You might not feel any slowness when you use this free antivirus software even your PC are not a high end system. I have a lot of friend using Avira Antivirus at their computer, so far never heard any complain from them.

www.avira.com (more…)

Posted by calvyn | 7 Comments »