I need to backup/clone the entire operating system. The problem is it's 2TB of data on lvm partition and RAID10 (i do not know is it dedicated controller or fake RAID in BIOS. Probably the second option) Which tool will be the best for this ? Ghost does not support the lvm partition dd is dangerous because it is easy to destroy the data. (backup will be creating by other technician)
i need help. thx
Get knoppix and use dd_rescue to copy the LVM to another LVM, physical or network location.
Example:
**to local drive**
dd if=/dev/sda1 of=/media/sda5 bs=512 count=1
**to network location**
dd_rescue /dev/sda1 – | ssh root@somehost ” cat – > /some/path/filename.img
UPDATE:
To copy the data to another HD, first, you need to know which drive you're copying from and which drive you're copying to. So, you'll use lshw or fdisk -l or disklabel. Whichever application will let you list out all your disks and volumes.
For example, if you want to copy /dev/sda1 (partition 1 on disk 1) to /dev/sdb1 (partition 1 on disk 2), you can do:
dd if=/dev/sda1 of=/dev/sdb1
The bs is the byte size you want to use. Generally, larger byte sizes allow for faster copying.
Apparently, I've been out of the game for a while, and now gddrescue is available, which is supposed to be more powerful. It follows the same principles:
ddrescue -f -n /dev/sda1 /dev/sdb1 logfile
Where /dev/sda1 is the partition of the LVM and /dev/sdb1 is the partition on the new drive you want, and logfile is the location/name of the logfile you'll want to generate. -f forces even on error and -n skips areas that are damaged or hard to copy. You can add -b to change the bytesize, but the default is 512, which is sufficient for most use cases. You can use a higher number if you want to go faster, like, 4096.
