dd_rescue(ddrescue)版
root@ubuntu:~# cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=12.10 DISTRIB_CODENAME=quantal DISTRIB_DESCRIPTION="Ubuntu 12.10" root@ubuntu:~# apt-get install gddrescue Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: gddrescue 0 upgraded, 1 newly installed, 0 to remove and 489 not upgraded. Need to get 93.8 kB of archives. After this operation, 211 kB of additional disk space will be used. Get:1 http://jp.archive.ubuntu.com/ubuntu/ quantal/universe gddrescue i386 1.16-1 [93.8 kB] Fetched 93.8 kB in 0s (344 kB/s) Selecting previously unselected package gddrescue. (Reading database ... 152263 files and directories currently installed.) Unpacking gddrescue (from .../gddrescue_1.16-1_i386.deb) ... Processing triggers for man-db ... Processing triggers for install-info ... Setting up gddrescue (1.16-1) ... root@ubuntu:~# time ddrescue /dev/sda /dev/sdc ddrescue: Output file exists and is not a regular file. ddrescue: Use '--force' if you really want to overwrite it, but be aware that all existing data in the output file will be lost. Try 'ddrescue --help' for more information. real 0m0.003s user 0m0.000s sys 0m0.000s root@ubuntu:~# ddrescue --help GNU ddrescue - Data recovery tool. Copies data from one file or block device to another, trying hard to rescue data in case of read errors. Usage: ddrescue [options] infile outfile [logfile] You should use a logfile unless you know what you are doing. Options: -h, --help display this help and exit -V, --version output version information and exit -a, --min-read-rate=<bytes> minimum read rate of good areas in bytes/s -A, --try-again mark non-split, non-trimmed blocks as non-tried -b, --block-size=<bytes> sector size of input device [default 512] -B, --binary-prefixes show binary multipliers in numbers [SI] -c, --cluster-size=<sectors> sectors to copy at a time [128] -C, --complete-only do not read new data beyond logfile limits -d, --direct use direct disc access for input file -D, --synchronous use synchronous writes for output file -e, --max-errors=[+]<n> maximum number of [new] error areas allowed -E, --max-error-rate=<bytes> maximum allowed rate of read errors per second -f, --force overwrite output device or partition -F, --fill=<types> fill given type blocks with infile data (?*/-+) -g, --generate-logfile generate approximate logfile from partial copy -i, --input-position=<bytes> starting position in input file [0] -I, --verify-input-size verify input file size with size in logfile -K, --skip-size=<bytes> initial size to skip on read error [64 KiB] -m, --domain-logfile=<file> restrict domain to finished blocks in file -M, --retrim mark all failed blocks as non-trimmed -n, --no-split do not try to split or retry failed blocks -o, --output-position=<bytes> starting position in output file [ipos] -p, --preallocate preallocate space on disc for output file -q, --quiet suppress all messages -r, --max-retries=<n> exit after given retries (-1=infinity) [0] -R, --reverse reverse direction of copy operations -s, --max-size=<bytes> maximum size of input data to be copied -S, --sparse use sparse writes for output file -t, --truncate truncate output file to zero size -T, --timeout=<interval> maximum time since last successful read -v, --verbose be verbose (a 2nd -v gives more) -x, --extend-outfile=<bytes> extend outfile size to be at least this long Numbers may be followed by a multiplier: b = blocks, k = kB = 10^3 = 1000, Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc... Time intervals have the format 1[.5][smhd] or 1/2[smhd]. Report bugs to bug-ddrescue@gnu.org Ddrescue home page: http://www.gnu.org/software/ddrescue/ddrescue.html General help using GNU software: http://www.gnu.org/gethelp root@ubuntu:~# time ddrescue /dev/sda /dev/sdc ddrescue: Output file exists and is not a regular file. ddrescue: Use '--force' if you really want to overwrite it, but be aware that all existing data in the output file will be lost. Try 'ddrescue --help' for more information. real 0m0.003s user 0m0.000s sys 0m0.000s root@ubuntu:~# ddrescue --help GNU ddrescue - Data recovery tool. Copies data from one file or block device to another, trying hard to rescue data in case of read errors. Usage: ddrescue [options] infile outfile [logfile] You should use a logfile unless you know what you are doing. Options: -h, --help display this help and exit -V, --version output version information and exit -a, --min-read-rate=<bytes> minimum read rate of good areas in bytes/s -A, --try-again mark non-split, non-trimmed blocks as non-tried -b, --block-size=<bytes> sector size of input device [default 512] -B, --binary-prefixes show binary multipliers in numbers [SI] -c, --cluster-size=<sectors> sectors to copy at a time [128] -C, --complete-only do not read new data beyond logfile limits -d, --direct use direct disc access for input file -D, --synchronous use synchronous writes for output file -e, --max-errors=[+]<n> maximum number of [new] error areas allowed -E, --max-error-rate=<bytes> maximum allowed rate of read errors per second -f, --force overwrite output device or partition -F, --fill=<types> fill given type blocks with infile data (?*/-+) -g, --generate-logfile generate approximate logfile from partial copy -i, --input-position=<bytes> starting position in input file [0] -I, --verify-input-size verify input file size with size in logfile -K, --skip-size=<bytes> initial size to skip on read error [64 KiB] -m, --domain-logfile=<file> restrict domain to finished blocks in file -M, --retrim mark all failed blocks as non-trimmed -n, --no-split do not try to split or retry failed blocks -o, --output-position=<bytes> starting position in output file [ipos] -p, --preallocate preallocate space on disc for output file -q, --quiet suppress all messages -r, --max-retries=<n> exit after given retries (-1=infinity) [0] -R, --reverse reverse direction of copy operations -s, --max-size=<bytes> maximum size of input data to be copied -S, --sparse use sparse writes for output file -t, --truncate truncate output file to zero size -T, --timeout=<interval> maximum time since last successful read -v, --verbose be verbose (a 2nd -v gives more) -x, --extend-outfile=<bytes> extend outfile size to be at least this long Numbers may be followed by a multiplier: b = blocks, k = kB = 10^3 = 1000, Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc... Time intervals have the format 1[.5][smhd] or 1/2[smhd]. Report bugs to bug-ddrescue@gnu.org Ddrescue home page: http://www.gnu.org/software/ddrescue/ddrescue.html General help using GNU software: http://www.gnu.org/gethelp
root@ubuntu:~# fdisk -l Disk /dev/sda: 512.1 GB, 512110190592 bytes 240 heads, 63 sectors/track, 66151 cylinders, total 1000215216 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x9bdbf079 Device Boot Start End Blocks Id System /dev/sda1 * 63 976768064 488384001 7 HPFS/NTFS/exFAT Disk /dev/sdb: 2021 MB, 2021654528 bytes 63 heads, 62 sectors/track, 1010 cylinders, total 3948544 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0009e87d This doesn't look like a partition table Probably you selected the wrong device. Device Boot Start End Blocks Id System /dev/sdb1 ? 3223366752 3470046675 123339962 f4 SpeedStor /dev/sdb2 ? 378192737 710426324 166116794 10 OPUS /dev/sdb3 ? 225603442 225603451 5 74 Unknown Partition table entries are not in disk order Disk /dev/sdc: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x9bdbf079 Device Boot Start End Blocks Id System /dev/sdc1 * 2048 2459647 1228800 7 HPFS/NTFS/exFAT /dev/sdc2 2459648 976767588 487153970+ 7 HPFS/NTFS/exFAT root@ubuntu:~# time dd if=/dev/sda of=/dev/sdc bs=4096 dd: reading `/dev/sda': Input/output error 275136+0 records in 275136+0 records out 1126957056 bytes (1.1 GB) copied, 14.755 s, 76.4 MB/s real 0m14.758s user 0m0.148s sys 0m2.596s root@ubuntu:~# time ddrescue -f /dev/sda /dev/sdc GNU ddrescue 1.16 Press Ctrl-C to interrupt rescued: 500106 MB, errsize: 967 kB, current rate: 1048 kB/s ipos: 500107 MB, errors: 25, average rate: 51916 kB/s opos: 500107 MB, time since last successful read: 0 s Copying non-tried blocks... ddrescue: write error: No space left on device real 160m32.673s user 0m48.815s sys 51m55.083s
apt-get install ddrescue cat > chk.sh mkdir /mnt/sda1 mkdir /mnt/sdb1 mount -o ro /dev/sda1 /mnt/sda1 mount -o ro /dev/sdb1 /mnt/sdb1 rm -f a b test -a /mnt/sda1/pagefile.sys || (echo NG ; exit) touch a umount /mnt/sda1 umount /mnt/sdb1 test -a /mnt/sdb1/pagefile.sys && test /mnt/sda1/pagefile.sys -ot /mnt/sdb1/pagefile.sys && (echo NG ; exit) touch b test -a a && test -a b && time dd_rescue /dev/sda /dev/sdb
# time dd_rescue /dev/sda /dev/sdb
dd_resdd_rescue: (info): ipos: 273408.0k, opos: 273408.0k, xferd: 27340dd_rescue: (info): ipos: 312571200.0k, opos: 312571200.0k, xferd: 312571200.0k
errs: 0, errxfer: 0.0k, succxfer: 312571200.0k
+curr.rate: 9741kB/s, avg.rate: 11011kB/s, avg.load: 5.0%
dd_rescue: (info): /dev/sda (312571224.0k): EOF
Summary for /dev/sda -> /dev/sdb:
dd_rescue: (info): ipos: 312571224.0k, opos: 312571224.0k, xferd: 312571224.0k
errs: 0, errxfer: 0.0k, succxfer: 312571224.0k
+curr.rate: 8325kB/s, avg.rate: 11011kB/s, avg.load: 5.0%
real 473m7.103s
user 0m21.533s
sys 23m27.412s以下は古い記述
cat > chk.sh mkdir /mnt/sda1 mkdir /mnt/sdb1 mount -o ro /dev/sda1 /mnt/sda1 mount -o ro /dev/sdb1 /mnt/sdb1 rm -f a b test -a /mnt/sda1/pagefile.sys || (echo NG ; exit) touch a umount /mnt/sda1 umount /mnt/sdb1 test -a /mnt/sdb1/pagefile.sys && test /mnt/sda1/pagefile.sys -ot /mnt/sdb1/pagefile.sys && (echo NG ; exit) touch b test -a a && test -a b && time dd if=/dev/sda of=/dev/sdb bs=4096
めも
# bash chk.sh
# watch -n 60 "killall -USR1 dd ; dmesg | tail"
78142806+0 records in 78142806+0 records out 320072933376 bytes (320 GB) copied, 13168.9 s, 24.3 MB/s real 219m28.926s user 0m37.482s sys 22m37.029s
通常の速度だな。
expresspci & esata
# time dd if=/dev/sda of=/dev/sdb bs=4096 703773+0 records in 703772+0 records out 2882650112 bytes (2.9 GB) copied, 37.2263 s, 77.4 MB/s 1821401+0 records in 1821400+0 records out 7460454400 bytes (7.5 GB) copied, 97.2543 s, 76.7 MB/s 2948889+0 records in 2948888+0 records out 12078645248 bytes (12 GB) copied, 157.271 s, 76.8 MB/s () 500107862016 bytes (500 GB) copied, 8328.5 s, 60.0 MB/s real 138m48.501s user 1m31.890s sys 22m15.531s
