Hi,
Just wanted to share this interesting test result I found about
switching the ssh cipher. I am running the 3.0.0 beta3 in production on
a fairly small centos4 server (basic spec but with a 1.5TB raid5 setup)
and backing up a variety of windows, linux and solaris across a 100mbit
lan.
I wanted to see whether I could speed up the data transfer without
resorting to rsh or applying the no-encryption patch for ssh, so I did
some tests and found that arcfour was the fastest cipher for me (seems
to be a common conclusion), by a factor of about 2.
Interestingly when I start using this in the backuppc ssh config it has
made huge improvements to the backup completion time by a factor of up
to 10. Here are stats showing the difference, the cipher was switched
after backup 21:
Backup# Type Filled Level Start Date
Duration/mins
Age/days Server Backup Path
15 full yes 0 12/28 20:00 811.7 18.5
/home/backuppc/data/pc/oddball/15
18 incr no 1 1/1 01:00 124.9 15.3
/home/backuppc/data/pc/oddball/18
19 incr no 1 1/2 01:00 137.2 14.3
/home/backuppc/data/pc/oddball/19
20 incr no 1 1/3 01:00 124.2 13.3
/home/backuppc/data/pc/oddball/20
21 incr no 1 1/4 01:00 145.2 12.3
/home/backuppc/data/pc/oddball/21
22 full yes 0 1/13 12:43 212.4 2.8
/home/backuppc/data/pc/oddball/22
23 incr no 1 1/14 12:14 7.7 1.8
/home/backuppc/data/pc/oddball/23
24 incr no 1 1/15 12:14 7.5 0.8
/home/backuppc/data/pc/oddball/24
Totals Existing Files New Files
Backup# Type #Files Size/MB MB/sec #Files Size/MB
#Files Size/MB
15 full 269365 5971.7 0.12 99242 863.5 180563 5115.6
18 incr 2151 256.2 0.03 1335 21.2 855 235.1
19 incr 2161 258.2 0.03 1509 25.1 686 233.2
20 incr 2167 260.2 0.03 1518 26.2 681 234.0
21 incr 2173 262.1 0.03 1244 26.9 962 235.3
22 full 268940 5993.7 0.47 268640 5722.1 11914 279.1
23 incr 2136 257.2 0.56 1598 18.1 2965 239.3
24 incr 2142 259.1 0.57 1493 22.1 682 237.1
I'd be interested to know if others have seen similar results.
Phil
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