Explanation
This illustration demonstrates Availability by showing the abundance of goods and military presence.
Fall of the Han Dynasty
The Western Han Dynasty faced financial deterioration due to extensive foreign campaigns and increased taxes, which caused public hardship. Controversial policies like price stabilization and state monopolies on salt and iron were criticized. Following Emperor Wu's death, power struggles among bureaucrats, eunuchs, and maternal relatives, along with the rise of local clans, weakened the dynasty, leading to its fall to Wang Mang in 8 AD.
Wang Mang established the Xin Dynasty (8-23 AD) and attempted reforms based on the Zhou system, but these policies were unsuitable for the time, leading to increased chaos. The dynasty also faced famine and peasant rebellions, culminating in its collapse in 23 AD. Emperor Guangwu Liu Xiu then founded the Later Han Dynasty (25-220), restoring stability initially and expanding influence through conquests and foreign exchanges.
However, by the end of the 1st century, power struggles among maternal relatives, eunuchs, and bureaucrats resurfaced, causing political instability. The Yellow Turban Rebellion in 184 and the subsequent rise of warlords led to further chaos, resulting in the fall of the Later Han Dynasty in 220.
What is Availability?
Availability refers to uninterrupted access to information and the availability of data and systems when needed. Examples of such measures include 24/7 availability, data redundancy and replication, backup and restore, and load balancing for cloud services, etc.
What is Redundancy?
Prepare spare systems for servers and network systems in case of equipment failure or load caused by sudden access concentration. A spare system is operated in parallel to maintain functionality in the event of a system failure.
When a failure occurs in the main system, losses can be minimized by instantly switching to a backup system. In addition, in a cyber attack, natural disaster, or other emergency, business can be continued by switching to a spare system while minimizing damage. Redundancy is required today as the need for business continuity planning (BCP) increases.
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