linux - rsync 同步文件时卡住不动

Question

具体表现是：我使用rsync往服务器同步文件，我设置了超时timeout=5（不设置这个值也会出现这样的问题），然后运行大约1小时后，不断出现timeout的错误提示，出现大约10多个后，程序卡在rsync上不往下运行。此时的CPU很高，如下：

PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                                             
 2243 luffyctz  25   0  3900 1184  944 R   99  0.0   8:08.98 rsync   

请问这是什么问题呢？

server端的log补充：
2015/03/24 20:05:59 [9603] Service registration expired, refreshing it
2015/03/24 20:05:59 [9603] rsyncd registering 1 service with slpd for 300 seconds:
2015/03/24 20:05:59 [9603] Could not resolve hostname: Name or service not known
2015/03/24 20:10:36 [23380] rsync error: timeout in data send/receive (code 30) at io.c(171) [receiver=2.6.8]

客户端的错误提示：
rsync error: timeout in data send/receive (code 30) at io.c(171) [receiver=2.6.8]
rsync: connection unexpectedly closed (4 bytes received so far) [sender]

Answer 1

-v can add log level, you can try adding it.
In addition, your rsync server can also configure the log level. What errors does the rsync server display?

Answer 2

Clear the number and file size of synchronized files. I once encountered a situation where the CPU was very high and there was no speed limit, and it was occupied crazy. Use --bwlimit=500 to limit it to 500kb/s.

In addition, you should really open the log and paste the complete log. Just saying a timeout cannot diagnose

Answer 3

Visually it is a network problem.