Redundant networking¶ You should conduct a high availability risk analysis to determine whether to use redundant switches such as Top of Rack (ToR) switches. In most cases, it is much more economical to use single switches with a small pool of spare switches to replace failed units than it is to outfit an entire data center with redundant switches. Applications should tolerate rack level outages without affecting normal operations since network and compute resources are easily provisioned and plentiful. Research indicates the mean time between failures (MTBF) on switches is between 100,000 and 200,000 hours. This number is dependent on the ambient temperature of the switch in the data center. When properly cooled and maintained, this translates to between 11 and 22 years before failure. Even in the worst case of poor ventilation and high ambient temperatures in the data center, the MTBF is still 2-3 years.
时间: 2024-02-14 12:33:25 浏览: 464
冗余网络
您应该进行高可用性风险分析,以确定是否使用冗余交换机,例如顶级交换机(ToR交换机)。在大多数情况下,与使用冗余交换机来配置整个数据中心相比,使用单个交换机并配备一小批备用交换机以替换故障单元的成本要低得多。由于网络和计算资源易于配置且丰富,应用程序应该能够容忍机架级别的故障,而不会影响正常运营。
研究表明,交换机的平均故障间隔时间(MTBF)在10万至20万小时之间。这个数字取决于数据中心中交换机的环境温度。在正确冷却和维护的情况下,这意味着在故障之前可以使用11到22年。即使在数据中心通风不良和环境温度较高的最糟糕情况下,MTBF仍为2-3年。
相关问题
Intuitively, a canonical cover of a set of dependencies F is the “minimal” set of FDs equivalent to F. • No redundant dependencies or extraneous attributes in any one of the dependencies. • Formally, A canonical cover for F is a set of dependencies Fc such that • F logically implies all dependencies in Fc, and • Fc logically implies all dependencies in F, and • No functional dependency in Fc contains an extraneous attribute, and • Each left side of functional dependency in Fc is unique. 用中文详细讲解以上内容及相关知识点
"规范覆盖"是指一组等价于给定依赖关系集合 F 的最小函数依赖集合。规范覆盖需要满足以下条件:
1. 覆盖所有 F 中的函数依赖;
2. 没有冗余的函数依赖;
3. 没有任何一个函数依赖包含多余的属性;
4. Fc 中任何一个函数依赖的左侧都是唯一的。
在数据库中,函数依赖是指关系模式中一个属性或属性集合的取值决定了其他属性或属性集合的取值。规范覆盖的作用是简化关系模式,避免数据冗余和不一致性。通过找到规范覆盖,我们可以得到一个最小的关系模式,其中每个属性都是必需的。这有助于提高数据库的性能和可维护性。
Avoided redundant navigation to current location: "/test". NavigationDuplicated: Avoided redundant navigation to current location: "/test".
这个错误提示是因为在Vue Router中,当你尝试导航到当前活动的路由时,会抛出NavigationDuplicated错误。这通常是由于重复点击导航链接或在代码中多次调用$router.push('/test')等导航方法引起的。为了避免这个错误,你可以在导航之前检查当前路由是否与要导航的路由相同,如果相同则不进行导航。以下是一个例子:
```javascript
const currentRoute = this.$router.currentRoute;
if (currentRoute.path !== '/test') {
this.$router.push('/test');
}
```
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