Gentoo Archives: gentoo-user

From: Valmor de Almeida <val.gentoo@×××××.com>
To: gentoo-user@l.g.o
Subject: [gentoo-user] Re: is ddrescue this slow?
Date: Sat, 09 Jan 2010 07:20:54
Message-Id: 128ccc221001082320m339e68c0n65b464bb3b8e3373@mail.gmail.com
In Reply to: [gentoo-user] is ddrescue this slow? by Valmor de Almeida
1 On Sat, Jan 9, 2010 at 3:33 AM, Valmor de Almeida <val.gentoo@×××××.com>wrote:
2
3 >
4 > Hello,
5 >
6 > I am trying to recover data from a failed drive. An initial attempt with dd
7 > took over 12 hours and it was not even at half of the 80GB damaged drive; so
8 > I quit. Info on the web pointed me to ddrescue
9 >
10 > ddrescue -n /dev/sda /dev/sdc rescued.log
11 >
12 > which has taken over 6 hours so far
13 >
14 > Press Ctrl-C to interrupt
15 > Initial status (read from logfile)
16 > rescued: 0 B, errsize: 0 B, errors: 0
17 > Current status
18 > rescued: 58656 MB, errsize: 4408 kB, current rate: 4096 B/s
19 > ipos: 58660 MB, errors: 32, average rate: 2958 kB/s
20 > opos: 58660 MB, time from last successful read: 0 s
21 > Copying non-tried blocks...
22 >
23 > The "current rate" varies and sometimes is down to a few B/s!
24 > Is this normal? The drive copied to is a USB external drive.
25 >
26 > Thanks for inputs.
27 >
28 > --
29 > Valmor
30 >
31 >
32 It's about 10 hours now since it started and here it is
33
34 Press Ctrl-C to interrupt
35 Initial status (read from logfile)
36 rescued: 0 B, errsize: 0 B, errors: 0
37 Current status
38 rescued: 58763 MB, errsize: 22918 kB, current rate: 1376 kB/s
39 ipos: 58786 MB, errors: 66, average rate: 1751 kB/s
40 opos: 58786 MB, time from last successful read: 0 s
41 Copying non-tried blocks...
42
43 Sometimes the "current rate" reads 0 B/s for a long time... and "time from
44 last successful read" can be 8m.
45
46 Would any one know whether this is normal?
47
48 Thanks,
49
50 --
51 Valmor

Replies

Subject Author
Re: [gentoo-user] Re: is ddrescue this slow? Neil Bothwick <neil@××××××××××.uk>