Difference between revisions of "duplicate a hard drive using dump and restore"

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Line 38: Line 38:
 
  Disk identifier: 0x01a8acb1
 
  Disk identifier: 0x01a8acb1
 
  <br>  Device Boot      Start        End      Blocks  Id  System
 
  <br>  Device Boot      Start        End      Blocks  Id  System
−
  /dev/sde1           2048      133119      65536  83  Linux
+
  /dev/sdb1           2048      133119      65536  83  Linux
−
  /dev/sde2         133120    16910335    8388608  82  Linux swap / Solaris
+
  /dev/sdb2         133120    16910335    8388608  82  Linux swap / Solaris
−
  /dev/sde3       16910336  121767935    52428800  83  Linux
+
  /dev/sdb3       16910336  121767935    52428800  83  Linux
  
  
Line 48: Line 48:
  
 
  # '''mkdir /mnt/sdb1'''
 
  # '''mkdir /mnt/sdb1'''
−
  # '''mkdir /mnt/sdb2'''
+
  # '''mkdir /mnt/sdb3'''
 +
 
 +
note: we are skipping the swap partition as there is no point in duplicating data there
  
 
dump first partition (in this example boot)
 
dump first partition (in this example boot)

Revision as of 14:06, 30 June 2014

This guide will show you how to duplicate a hard drive's running, mounted filesystems to another drive.

source drive = /dev/sda target drive = /dev/sdb

prep target drive

create the partitions and filesystems on the destination hard drive

from the restore man page... 

Restore  (rebuild)  a  file  system. The target file system should be made pristine with mke2fs(8), mounted, and the user
             cd'd into the pristine file system before starting the restoration of the initial level 0 backup.

list source drive partion info 

# fdisk -l /dev/sda

Disk /dev/sda: 64.0 GB, 64023257088 bytes, 125045424 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: 0x77804419

  Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      133119       65536   83  Linux
/dev/sda2          133120    16910335     8388608   82  Linux swap / Solaris
/dev/sda3        16910336   121767935    52428800   83  Linux


duplicate the partition info above on the target drive

one limitation of using dump / restore is that the filesystem geometry must match between the source and the target drives. I use fdisk to do this. The steps aren't included here. When done your target drive partions should match the source above.

example: 

# fdisk -l /dev/sdb

Disk /dev/sde: 80.0 GB, 80026361856 bytes, 156301488 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: 0x01a8acb1

  Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048      133119       65536   83  Linux
/dev/sdb2          133120    16910335     8388608   82  Linux swap / Solaris
/dev/sdb3        16910336   121767935    52428800   83  Linux


perform dump / restore

make temporary mount points 

# mkdir /mnt/sdb1
# mkdir /mnt/sdb3

note: we are skipping the swap partition as there is no point in duplicating data there

dump first partition (in this example boot) 

# mount /dev/sdb1 /mnt/sdb1
# cd /mnt/sdb1
# dump -0 -f - /boot | restore -r -f -
 DUMP: WARNING: no file `/etc/dumpdates'
 DUMP: Date of this level 0 dump: Tue Apr 29 15:45:03 2014
 DUMP: Dumping /dev/sda1 (/boot) to standard output
 DUMP: Label: none
 DUMP: Writing 10 Kilobyte records
 DUMP: mapping (Pass I) [regular files]
 DUMP: mapping (Pass II) [directories]
 DUMP: estimated 24536 blocks.
 DUMP: Volume 1 started with block 1 at: Tue Apr 29 15:45:03 2014
 DUMP: dumping (Pass III) [directories]
 DUMP: dumping (Pass IV) [regular files]
 DUMP: Volume 1 completed at: Tue Apr 29 15:45:03 2014
 DUMP: Volume 1 24580 blocks (24.00MB)
 DUMP: 24580 blocks (24.00MB)
 DUMP: finished in less than a second
 DUMP: Date of this level 0 dump: Tue Apr 29 15:45:03 2014
 DUMP: Date this dump completed:  Tue Apr 29 15:45:03 2014
 DUMP: Average transfer rate: 0 kB/s
 DUMP: DUMP IS DONE

look at my pretty files 

# ls -1
System.map-genkernel-x86_64-3.10.17-gentoo
System.map-genkernel-x86_64-3.7.9-gentoo
boot
grub
initramfs
initramfs-genkernel-x86_64-3.10.17-gentoo
initramfs-genkernel-x86_64-3.7.9-gentoo
...

now for the good stuff, dumping a running root filesystem!

mount and cd to restore point on the target drive 

# mount /dev/sdb3 /mnt/sdb3
# cd /mnt/sdb3

dump and restore files 

# dump -0 -f - / | restore -r -f -
 DUMP: WARNING: no file `/etc/dumpdates'
 DUMP: Date of this level 0 dump: Tue Apr 29 15:45:46 2014
 DUMP: Dumping /dev/sda3 (/) to standard output
 DUMP: Label: none
 DUMP: Writing 10 Kilobyte records
 DUMP: mapping (Pass I) [regular files]
 DUMP: mapping (Pass II) [directories]
 DUMP: estimated 14965465 blocks.
 DUMP: Volume 1 started with block 1 at: Tue Apr 29 15:45:54 2014
 DUMP: dumping (Pass III) [directories]
 DUMP: dumping (Pass IV) [regular files]
 DUMP: 36.90% done at 18406 kB/s, finished in 0:08
 DUMP: 77.94% done at 19441 kB/s, finished in 0:02
 DUMP: 98.49% done at 16232 kB/s, finished in 0:00
 DUMP: Volume 1 completed at: Tue Apr 29 16:01:38 2014
 DUMP: Volume 1 14918960 blocks (14569.30MB)
 DUMP: Volume 1 took 0:15:44
 DUMP: Volume 1 transfer rate: 15803 kB/s
 DUMP: 14918960 blocks (14569.30MB)
 DUMP: finished in 944 seconds, throughput 15803 kBytes/sec
 DUMP: Date of this level 0 dump: Tue Apr 29 15:45:46 2014
 DUMP: Date this dump completed:  Tue Apr 29 16:01:38 2014
 DUMP: Average transfer rate: 15803 kB/s
 DUMP: DUMP IS DONE
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