how long should it take to backup 100gb?

back-.space · 05-27-2009, 08:49 PM

Hi all

Using dd it takes about 25 hours to copy from a 100gb drive to a 100 usb drive. Is that right? I tried Clonezilla and that takes around 6 hours. Is there any other live cds that backup/clone faster? I have been using acronis and that takes around 2 hours 100gb hhd to 100gb usb. I am looking for something Live and around 2 hours if possible.
Bckspc

billymayday · 05-27-2009, 09:00 PM

What parameters are you using for dd? Setting bs is a key speed parameter, and playing with different values should give you a good idea of the optimum.

back-.space · 05-27-2009, 10:25 PM

hi billymayday
bs=9728
is there a app to see the output/speed/time of dd?

billymayday · 05-27-2009, 10:28 PM

Where did 9728 come from?

I've simple run tests before using

time dd if=foo of=bar bs=whatever

for different values of bs with a testfile of reasonable size.

back-.space · 05-27-2009, 10:32 PM

I am only new to linux so got the command line off a fourm is it wrong? what do you use?

billymayday · 05-27-2009, 10:35 PM

Really depends on your machine. Read the first post or two of this http://www.linuxquestions.org/questi...ommand-362506/ to get some ideas.

billymayday · 05-27-2009, 10:55 PM

Here are a couple of examples for you:

Code:

$ time dd if=F10-i686-Live-XFCE.iso of=f.iso bs=1M
619+1 records in
619+1 records out
649213952 bytes (649 MB) copied, 27.1502 seconds, 23.9 MB/s

real    0m27.167s
user    0m0.004s
sys     0m2.857s
$ time dd if=F10-i686-Live-XFCE.iso of=f2.iso bs=1K
633998+0 records in
633998+0 records out
649213952 bytes (649 MB) copied, 40.1385 seconds, 16.2 MB/s

real    0m40.158s
user    0m0.491s
sys     0m6.056s
$ time dd if=F10-i686-Live-XFCE.iso of=f2.iso bs=9728
66736+1 records in
66736+1 records out
649213952 bytes (649 MB) copied, 26.0892 seconds, 24.9 MB/s

real    0m26.601s
user    0m0.072s
sys     0m3.353s
$ time dd if=F10-i686-Live-XFCE.iso of=f2.iso bs=512
1267996+0 records in
1267996+0 records out
649213952 bytes (649 MB) copied, 31.6837 seconds, 20.5 MB/s

real    0m32.025s
user    0m0.904s
sys     0m9.273s
$ time dd if=F10-i686-Live-XFCE.iso of=f2.iso bs=8192
79249+1 records in
79249+1 records out
649213952 bytes (649 MB) copied, 21.6496 seconds, 30.0 MB/s

real    0m22.117s
user    0m0.068s
sys     0m3.120s
$ time dd if=F10-i686-Live-XFCE.iso of=f2.iso bs=16384
39624+1 records in
39624+1 records out
649213952 bytes (649 MB) copied, 26.4255 seconds, 24.6 MB/s

real    0m26.776s
user    0m0.042s
sys     0m2.863s
$ time dd if=F10-i686-Live-XFCE.iso of=f2.iso bs=4096
158499+1 records in
158499+1 records out
649213952 bytes (649 MB) copied, 29.7177 seconds, 21.8 MB/s

real    0m30.066s
user    0m0.151s
sys     0m3.323s