Convert and copy a file, write disk headers, boot records, create a boot floppy. dd can make an exact clone of an (unmounted) disk, this will include all blank space so the output destination must be at least as large as the input. For more info refer to the manpage.
3
votes
2answers
93 views
Save data after accidental dd format
as embarrassing as it sounds I managed to dd a debian iso to an external hd instead of my usb pen drive.
now my 1.5 tb western digital has 1 700mb partition named debian and the rest is unallocated ...
0
votes
0answers
36 views
Heavy disk write on a Debian VPS gives “ata1: lost interrupt (Status 0x50)”
I have a new Debian VPS that appears to fail almost every time I run a heavy disk write test on ext4 filesystem. The filesystem goes to read-only mode and "ata1: lost interrupt (Status 0x50)" is ...
0
votes
1answer
81 views
Clone Flash Drive in Linux using DD
dd if=/dev/sda of=/dev/sdb
I want to create a clone a bootable USB stick.
lets say sda is 2GB
sdb is 32GB.
The above line will create a replica but the usable size will be 2GB. How can I use the ...
2
votes
1answer
100 views
dd oflag=direct 5x fast
I have Centos 6.2 in server with this specs:
2xCPU 16 Core AMD Opteron 6282 SE
64GB RAM
Raid controller H700 1GB cache NV
- 2HD 74GB SAS 15Krpm RAID1 stripe 16k (OS Centos 6.2) sda
- 4HD 146GB SAS ...
1
vote
2answers
48 views
How to delete the MBR (Master boot record) out of an image file?
I have a QEMU image myserver.img that is about 20GiB. The file serves as a "virtual" hard disk for the server. Now the first 512 bytes contain the MBR, and I am trying to overwrite those bytes with ...
2
votes
3answers
57 views
Backup with dd upon reboot
I'm trying to implement the easy to maintain backup solution for our local linux server. The goal is to be able to restore the whole system from image file.
What I am thinking of is just to issue ...
1
vote
1answer
144 views
linux dd software raid?
Please advise what is the best way to create linux software raid image with dd?
/dev/md0 consists of /dev/sda & /dev/sdb.
I ran dd if=/dev/sda of=sda.img same for sdb
Restored on the remote ...
8
votes
2answers
267 views
How can I split a drive image created with 'dd' into separate files for each partition?
I created an image of a failing drive with:
dd if=/dev/sde of=/mnt/image001.dd
The drive had only two partitions:
Device Boot Start End Blocks Id System
/dev/sde1 * ...
0
votes
1answer
136 views
Moving a Logical Volume directly from one server to another over the network?
I have a KVM host machine with several VMs on it. Each VM uses a Logical Volume on the host. I need to copy the LVs to another host machine.
Normally, I would use something like:
dd ...
1
vote
2answers
140 views
Partition size inconsistency after dd clone
We have recently upgraded a system HDD - it was 160GB, now 2TB. We upgraded as we were running low on space, mainly on /usr, and also on /home.
I prepared the new drive with a Live CD and GParted ...
3
votes
2answers
86 views
How to view a full disk data (more than one partition) cloned with dd
I've a disk image done with dd:
dd if=/dev/sda of=/mnt/fulldisk.img
/dev/sda have some partitions (Windows+Linux)
My problem is: I need to know if the image is done well, how can I access data? ...
2
votes
2answers
78 views
In Linux, how can I create thin-provisioned file so it can be mounted and a filesystem created on it?
I am building a system that gives users certain amounts of disk space. The way I am doing it is:
create a file with dd
create an ext4 filesystem inside the file
mount the file and tell the user ...
1
vote
1answer
187 views
Clone hard drive Solaris 8 (SunOS 5.8)
I have an old 73gb SAS SCSI drive, so I plugged in a new 73gb SAS SCSI and I want to clone everything from it to the new drive..
I want to clone SCSI hard drive SD20 to SD21.
Is there an easy way to ...
0
votes
0answers
60 views
Running dd from Ubuntu live, it goes to sleep
I needed to clone a hard drive, so I bought the exact same model that I have and stuck it into the computer. I put Ubuntu live on a flash drive and boot up from it. I check with sudo fdisk -l that I ...
-1
votes
1answer
55 views
How does this benchmark calculation work?
I am testing disk I/O performance on a server of mine, which will eventually run Postgresql. I am following this web site to perform my benchmarks.
The benchmark consists of running dd and ...
1
vote
2answers
117 views
Disk cloning using dd thru gzip - how effective is it? [closed]
Is gzip or gzip -9 for a disk clone worth the extra time that it takes to perform the compression? Does it yield a significant saving?
There is very little information on how effective piping data ...
1
vote
2answers
89 views
Large delay starting “dd” write in background in bash even when using nohup
I wrote a small script to print the memory usage during a large sequential write of a file.
#!/bin/bash
rm result
echo 3 > /proc/sys/vm/drop_caches
sync;
echo start
nohup time dd if=/dev/zero ...
2
votes
1answer
136 views
Raw copy with sector precision on windows
Is there some program for windows that is able to do what dd does in linux out of the box? I need to copy from a file to a physical disk in raw mode where I need to define offsets for input and ...
1
vote
1answer
183 views
/dev/zero equivalent in windows?
I am trying to use the windows version of dd to copy a RHEL iso to a USB stick. However, I wanted to zero out the drive first to ensure there is no filesystem on it before writing it out. Is there an ...
1
vote
1answer
50 views
Cloning a two partition HDD onto a smaller HDD and maintaining MBR
I have a hard disk(A) containing two partitions - A1 is a NTFS partition containing a windows OS, and A2 is an NTFS partition containing data. I want to copy both of these partitions onto a different, ...
0
votes
1answer
123 views
Oracle 10g cannot start after cloning server with dd
I used dd to clone a x4100 server with Linux Red Hat. The hardware is identical for old and new servers. Then I changed IP address and host name. The newly restored server is up and running but Oracle ...
0
votes
1answer
102 views
LVM tools on raw block copy
I have several raw block copies of disks that have both NTFS and Linux partitions. The parition tables generally have both a Windows NTFS partition and a Linux LVM partition. I need to work on all of ...
0
votes
1answer
110 views
Writing with dd in an NFS mount point
I am trying the following:
sudo dd if=/dev/sda1 of=/mnt/nfs/l bs=1M
It fails:
dd: opening `/mnt/nfs/l': Permission denied
However, normal file creation and writing with "cat" works.
What could ...
0
votes
2answers
75 views
copy boot-able partition
I have an disk image with 3 partitions:
first partition (hd0,0) is boot-able with GRUB1 with the following configuration GRUB file:
default=0
timeout=5
title Bank A
root (hd0,1)
...
0
votes
1answer
46 views
Does writing many times to a HDD cause early failiure
How many times could i run something like
dd if=/dev/urandom/ of=/dev/sda
before the hdd starts to suffer? I thought in a modern hard drive the head doesn't touch the platter, but i am still not ...
0
votes
1answer
241 views
sfdisk - partition creation problem
I'm trying to create disk image with 2 partitions:
First partition: 1Mb for boot and second partition of the maximum capacity
dd if=/dev/zero of=flash.img bs=1M count=10
/sbin/sfdisk flash.img ...
2
votes
1answer
221 views
combine partitions to one disk image
I have 3 images. Each image was done by cloning (by dd) a partition (these partitions formatted using ext3 file system).
One partition is boot-able with GRUB1 (CentOS)
How can I combine them to one ...
0
votes
2answers
219 views
How to clone with cat?
I want to clone an 8.1gig bootable disk to an 8.0gig disk and have the clone remain bootable.
dd causes problems because the destination disk is a few mb smaller than the source.
Can "cat" help me ...
1
vote
2answers
514 views
Monitor Disk I/O Using DD
I've bee looking into the possibility that my server is experiencing a lot of iowait issues. I've found a lot online about running the dd command. I am unable to run this conv:
[root@vps ~]# dd ...
2
votes
2answers
250 views
Is it possible to restore disk image to a different size hard disk
recently I made a backup 120 GB disk image using dd:
dd if=/dev/sda of=backup.img
Now I have a new 320 GB hard disk and want to restore that backup image to that new disk. Will running
dd ...
2
votes
2answers
177 views
After using dd new disk cannot be booted and partition tables lost
After I used dd to clone a 120 gb hard disk to new empty 320 gb hard disk, the new disk cannot be booted. And fdisk tell me the partition table is no valid and Gparted just cannot edit the ...
0
votes
1answer
138 views
Clone a real server to a VPS
I have an old server ( Red Hat Enterprise Linux ES release 2.1 (Panama) ) that is in desperate need of replacing, is it possible using dd / ssh to clone the server onto a Rackspace VPS? Or more ...
0
votes
3answers
364 views
SME Server: How do I do nightly Ghost-like backups?
I need to drop another hard drive into my company's SME Server-powered fileserver and figure out a way to do a nightly clone backup of the entire filesystem so that, if the hard drive fails, I can ...
1
vote
2answers
81 views
Copy a partition into a new image out of an existing dd image
How can I dd an image of a single partition out of a full-disk image? I know skip and count, but I am supposed to divide by bs, and since this is the first partition, it's start point is early in the ...
3
votes
6answers
479 views
How can I know if netcat & dd are working?
I'm running on server A (Source):
dd bs=16M if=/dev/sda|bzip2 -c|nc serverB.example.net 19000
On server B (Destination):
nc -l -p 19000|bzip2 -d|dd bs=16M of=/dev/sdb
Do I need to see some ...
4
votes
3answers
201 views
IDE compatability with SATA image
We had an old CNC machine's hard-drive fail recently. The hard-drive is an old 1275MB IDE (Seagate) and there were defiantly bad sectors on it. I was able to image the contents of the drive onto a ...
0
votes
3answers
161 views
Is it possible (and how if it is) dump two concatenaded disks in a new disk using DD?
I have a Lacie enclosure that has a setup with 2 500gb disks configured as 1 drive of 1TB, the only partition created for the whole drive is HFS+ journaled, but the controller in the enclosure is gone ...
0
votes
2answers
318 views
CentOS 5.5 installation on disk image
Today, in order to install CentOS 5.5 I'm using kickstart script.
I would like to install CentOS on different way:
Create disk image (using dd command)
Create filesystem on this disk image using ...
0
votes
1answer
430 views
Clone disk with dd, and change blocksize?
I need to clone my 300GB disk to 500GB disk with dd, but the old disk (300GB) has too *big block size.
Will this change the block size of output partition too? I understod that obs only meant to be ...
1
vote
3answers
313 views
Extracting Data from Raw Hard Drive Copy?
A while back something happened to my hard drive that wiped out the partition table and left my data unreadable. I had other uses for the drive, but I didn't want to give up on trying to recover the ...
0
votes
1answer
226 views
dd cloned win2003 std ntfs partition, “no operating system found”
I cloned an existing ntfs partition on faulty hardware using dd and gzip. The copied partition was then written to a newly created ntfs partition on a new disk (on another server) and the bootable ...
2
votes
3answers
441 views
Get exact size in bytes of a disk & partitions in windows
I'm using dd (under cygwin) to copy a shadow image of a disk in windows. Shadow copy will only give me a partion, so what I am doing is:
1) using dd to grab the disk header (32k on Win2003)
2) using ...
1
vote
2answers
2k views
LVM -> dd -> LVM?
I've 'cloned' a LVM partition using dd over ssh to a remote server(emergency backup...).
On that remote server, is it possible to 'transform' the dd cloned file back into a LVM partition?
Thanks.
...
0
votes
4answers
216 views
Why dd finishes instantly when pipelining to cat?
I start bash on Cygwin and type:
dd if=/dev/zero | cat /dev/null
It finishes instantly. When I type:
dd if=/dev/zero > /dev/null
it runs as expected and I can issue
killall -USR1 dd
to see ...
3
votes
3answers
523 views
Best way to copy large amount of data between partitions
I'm looking to transfer data across 2 lv of an HP-UX server. I have a couple of those transfers to do, some of which are mostly binary (Oracle tablespace...) and some others are more text files ...
1
vote
4answers
651 views
Creating a 80GB image with dd on a FAT32 drive
I have a question concerning the creation of an drive image with dd.
Normally i would simply type: "dd if=/dev/foo of=/dev/bar". But in this case i only have a fat32 formatted drive at hand, which ...
0
votes
1answer
333 views
cloning with dd - is non-partitioned space considered the same as empty space within filesystem for resulting image size?
note: all = all that i've found
all the "cloning with dd" information talks about how dd copies all the "empty space", but literally all writings seem to be responding to a situation where ...
1
vote
2answers
224 views
How can I use dd to back up the whole disk from inside a linux-vserver guest?
I have a Linux-vserver guest I want to dump the whole disk of. I have no access to the host.
I tried:
dd if=/dev/hdv1 | gzip -c | ssh user@remote.host.net 'dd of=/path/to/file.img' bs=2048
but the ...
1
vote
1answer
261 views
zeroing a disk with dd vs Disk Utility
I'm attempting to zero a disk on my Mac OS X machine. I'm going for complete zeros and unformatted, so I think of dd. Unfortunately the maximum throughput I've managed to get out of dd is 7MB/s. ...
1
vote
4answers
713 views
Best choice for off-site backup: dd vs tar
I have two 1TB single-partition hard disks configured as RAID1, of which I would like to make an off-site backup on a third disk, which I am still to buy. The idea is to store the backup at a ...
