Munin 图表含义
我已经使用 Munin 有几天了，我认为这是非常有趣的信息，但我不明白其中的一些图表，以及如何使用/阅读它们来获取信息来改进系统。
我不明白的是：
Disk Disk throughput per device Inode usage in percent IOstat Firewall Throughput Processes Fork rate Number of threads VMstat System Available entropy File table usage Individual interrupts Inode table usage Interrupts and context switches
Ty！
I've been using Munin for some days and I think it's very interesting information, but I don't understand some of the graphs, and how they can be used/read to get information to improve system.
The ones I don't understand are:
Disk Disk throughput per device Inode usage in percent IOstat Firewall Throughput Processes Fork rate Number of threads VMstat System Available entropy File table usage Individual interrupts Inode table usage Interrupts and context switches
Ty!
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Munin 创建的图表使您能够看到趋势。这对于查看您所做的更改是否不会对系统性能产生负面影响非常有用。
磁盘
每个设备的磁盘吞吐量IOstat
从磁盘设备写入或读取的数据量。与内存相比，磁盘总是慢。例如，大量磁盘读取可能表明您的数据库服务器没有足够的 RAM。
索引节点使用百分比
每个文件系统都有一个索引，用于存储有关文件的信息，例如名称、权限和磁盘上的位置。对于许多小文件，该索引的可用空间可能会耗尽。如果发生这种情况，即使设备上有足够的空间，也无法将新文件保存到该文件系统中。
防火墙吞吐量
就像它说的那样，通过 iptables 防火墙的数据包数量。通常，此防火墙在系统上的所有接口上都处于活动状态。仅当您在路由器/防火墙/网关系统上运行 munin 时，这才真正有趣。
流程
分叉率
进程是通过将现有进程分叉为两个进程来创建的。这是创建新进程的速率。
线程数
系统中运行的进程总数。
VMstat
CPU 时间的使用情况。
系统
可用熵：熵是对 /dev/urandom 中可用随机数的度量。创建 SSL 连接需要这些随机数。如果您创建大量 SSL 连接，则此随机池可能会用完真正的随机数。
文件表使用
系统中打开的文件总数。如果这个数字突然上升，则可能是某个程序没有正确释放其文件句柄。
Munin creates graphs that enable you to see trends. This is very useful to see if a change you made doesn't negatively impact the performance of the system.
Disk
Disk throughput per device & IOstat
The amount of data written or read from a disk device. Disks are always slow compared to memory. A lot of disk reads could for example indicate that your database server doesn't have enough RAM.
Inode usage in percent
Every filesystem has a index where information about the files is stored, like name, permissions and location on the disk. With many small files the space available to this index could run out. If that happens no new files can be saved to that filesystem, even if there is enough space on the device.
Firewall Throughput
Just like it says, the amount of packets going though the iptables firewall. Often this firewall is active on all interfaces on the system. This is only really interesting if you run munin on a router/firewall/gateway system.
Processes
Fork rate
Processes are created by forking a existing process into two processes. This is the rate at wich new processes are created.
Number of threads
The total number of processes running in the system.
VMstat
Usage of cpu time.
System
Available entropy: The entropy is the measure of the random numbers available from /dev/urandom. These random numbers are needed to create SSL connections. If you create a large number of SSL connections this randomness pool could possibly run out of real random numbers.
File table usage
The total number of files open in the system. If this number suddenly goes up there might be a program that is not releasing its file handles properly.