This command is used to do low level copying of data.

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-2
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3answers
63 views

Using dd for backup with a single disk

I have a RHEL5 Amazon cloud instance that I need to image to another instance in order to setup a test environment for some upcoming patching I'm doing. The server to be imaged is a production server. ...
6
votes
1answer
442 views

Experiences with using `dd` to copy multi-partition, multi-FS device

I have a disc with several partitions on, each of which has a different kind of file system (ext3, ext4, and, let's say, NTFS). I want to know if I can copy the whole disc to a new one (which is of ...
0
votes
1answer
102 views

how to boot from a backup disk created by dd

I use dd command to backup a disk. #dd if=/dev/sda of=/dev/sdb but when I boot from the backup disk, I got a error message check filesystem failed! I do not know how to settle this problem. I ...
1
vote
1answer
584 views

Operating System not found when loading DD image in VMware

I provide much details below to hopefully make my issue as clear as possible. Using dd if=/dev/ps3da2 of=/mnt/edexhdd/EDPS3LINUX.iso bs=16384 I copied a fairly huge partition from a physical Linux ...
4
votes
1answer
625 views

Backup root partition with dd without downtime

Is there a way to remount / as read-only and buffer new writes in RAM, so can backup the / media with dd? I want to create a bootable image from my SoHo-Server (Debian 6) without a live cd or any ...
1
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0answers
254 views

Backing up VMs to a tape drive

I've got myself one of these fancy tape drives, HP LTO2 with 200/400 GB cartridges. The st driver reports it like this: scsi 1:0:0:0: Sequential-Access HP Ultrium 2-SCSI T65D I can ...
-1
votes
1answer
141 views

Cloning my hard drive as a backup [closed]

At the moment, I have an Ubuntu 11.04 installation on a single 500GB hard drive in my laptop. The hard drive is partitioned into four parts: 500MB for the boot information, 2GB for the swap ...
4
votes
3answers
847 views

Recovering with DDRescue Cannot Complete (write error: Read-only file system)

I'm trying to recover a corrupt VDI using vdfuse to mount the VDI and using dd_rescue to rescue the borked partition. dd_rescue seems to be working fine but once it reached about half of the ...
4
votes
2answers
3k views

create image of a USB drive without unallocated partition

I have 8GB USB drive attached to my system which looks like this: [root@host]# fdisk -l /dev/sdb Disk /dev/sdb: 8462 MB, 8462008320 bytes 255 heads, 63 sectors/track, 1028 cylinders Units = ...
0
votes
1answer
545 views

Drive cloning dd or rsync/sync via KVM

I've got a crash and the system won't boot correctly. I am getting errors like: ata3.00: status: { DRDY } ata3.00: status: { UNC } What would be the best way to save the main drive to make the ...
10
votes
4answers
13k views

dd on entire disk, but do not want empty portion

I have a disk, say /dev/sda. Here is fdisk -l: Disk /dev/sda: 64.0 GB, 64023257088 bytes 255 heads, 63 sectors/track, 7783 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size ...
0
votes
2answers
309 views

Using dd command and running out of space while cloning drive to img

I have a problem with drive cloning. Im using dd on damaged disk with bad sectors trying to make an image from it. Im booting computer with Live Linux CD . Damaged disk: sda 146GB (NTFS) External ...
5
votes
2answers
4k views

Mounting a linux image built with “dd” on Mac OSX 10.7 [closed]

I recently did a ssh root@myserver "dd if=/dev/xvda " | dd of=/<localpath>/myimage.img as instructed by my VPS server docs at linode. I did this before to another linux system and mounted it ...
18
votes
3answers
2k views

Securely wipe an entire Linux server with itself

I have remote ssh access and root access. I do not have physical access. I'm not looking for solutions involving booting into anything, I want to do this from what is currently running. OS is SL6. ...
3
votes
2answers
429 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 ...
1
vote
0answers
556 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
2answers
1k 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
2k 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
183 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
95 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
726 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 ...
9
votes
2answers
1k 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 * ...
5
votes
3answers
9k 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 ...
2
votes
2answers
1k 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
232 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? ...
3
votes
2answers
1k 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
1k 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 ...
-1
votes
1answer
82 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
317 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
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2answers
610 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 ...
3
votes
2answers
1k 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 ...
7
votes
2answers
4k 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
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1answer
99 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, ...
1
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1answer
299 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
249 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
822 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
214 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
121 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
489 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 ...
9
votes
1answer
2k 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
468 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 ...
3
votes
2answers
2k 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
4k 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
542 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
284 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
777 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
131 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 ...
4
votes
6answers
2k 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
4answers
430 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
283 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 ...