linux scp限速传输

在将生产库的备份拷贝到UAT环境时，为降低对生产环境的影响，需要对SCP工具进行限速。

1 [oracle@xxDB01 xxxdb]$ scp -r lv0_20150607 10.0.97.33:/data/ivldb
2 Address 10.0.97.33 maps to localhost, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!
3 [email protected]'s password:
4 20150607.log                                                                       100%   71KB  71.2KB/s   00:00
5 level_0_ivldb_datafile_700_1                                  10%  787MB  11.2MB/s   10:06 ETAKilled by signal 2.

上面是未做限速的情况，我看到每秒传送11.2MB，当时以为生产库和UAT数据库之间的网络是百兆网，这不把带宽给跑满了吗，当时吓的汗毛都立起来了，现在想想应该不是百兆网，SCP工具很难把网络跑满，一般会使用百分之四五十的带宽，至于每秒11.2MB应该是交换机做了限制。可是问了几个同事都不能确定到底是多少的带宽，只好对SCP工具进行限速了。

SCP工具可是使用-l参数进行速度限制，单位是字节。

1 NAME
2      scp - secure copy (remote file copy program)
3
4 SYNOPSIS
5      scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file] [-l limit] [-o ssh_option] [-P port] [-S program] [[user@]host1:]file1 [...]
6          [[user@]host2:]file2
7      -l limit
8              Limits the used bandwidth, specified in Kbit/s.

限制每秒传输20000字节，也就约等于每秒传输2M的数据。

1	[oracle@XXDB01 xxdb]$ scp -rl 20000 lv0_20150607 10.0.97.33:/data/xxxdb

2	Address 10.0.97.33 maps to localhost, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!

3	[email protected]'s password:

4	20150607.log                                                                    100%   71KB  71.2KB/s   00:00

5	level_0_ivldb_datafile_700_1                                                     50% 3823MB   2.1MB/s   29:50

6	ETASlevel_0_ivldb_datafile_700_1                                                100% 7593MB   2.1MB/s   59:49

7	level_0_ivldb_datafile_699_1                                                    100% 8709MB   2.1MB/s 1:08:3