[20170508]加快scp拷贝速度.txt
--//使用scp -c arcfour加快拷贝速度.仅仅做一个记录,经常忘记这个参数-c arcfour.
$ scp -c arcfour /mnt/ramdisk/book/system01.dbf oracle@192.168.100.40:/tmp
oracle@192.168.100.40's password:
system01.dbf 100% 760MB 44.7MB/s 00:17
$ scp -c arcfour /mnt/ramdisk/book/system01.dbf oracle@192.168.100.40:/tmp
oracle@192.168.100.40's password:
system01.dbf 100% 760MB 76.0MB/s 00:10
$ scp -c arcfour /mnt/ramdisk/book/system01.dbf oracle@192.168.100.40:/tmp
oracle@192.168.100.40's password:
system01.dbf 100% 760MB 76.0MB/s 00:10
$ scp /mnt/ramdisk/book/system01.dbf oracle@192.168.100.40:/tmp
oracle@192.168.100.40's password:
system01.dbf 100% 760MB 42.2MB/s 00:18
$ scp /mnt/ramdisk/book/system01.dbf oracle@192.168.100.40:/tmp
oracle@192.168.100.40's password:
system01.dbf 100% 760MB 42.2MB/s 00:18
--//第一次没有缓存有点慢,需要17秒,也比后面的不加参数-c arcfour 18秒快.
# cachestats /mnt/ramdisk/book/system01.dbf
/mnt/ramdisk/book/system01.dbf pages in cache: 194562/194562 (100.0%) [filesize=778248.0K, pagesize=4K]
--//补充测试,在192.168.100.40删除
# rm /tmp/system01.dbf
/bin/rm: remove regular file `/tmp/system01.dbf'? y
--//重复测试:
$ scp /mnt/ramdisk/book/system01.dbf oracle@192.168.100.40:/tmp
oracle@192.168.100.40's password:
system01.dbf 100% 760MB 40.0MB/s 00:19
--//需要19秒,也就是正常情况下快1,2秒.而在已经缓存的情况下,速度更快.