Linux, programming and more
Migration from Freenas all ZFS volumes to another machines lvm is pretty simple.
create on you new machine logical volume and start netcat which will write everything it receives to the new LVM of your choice:
# Source box
1 | dd bs=16M if=/dev/disk/by-path/iscsi-mysql-lun-0 | nc 192.168.1.254 19000 |
# Destination box (192.168.1.254)
1 | nc -l -p 19000|dd bs=16M of=/dev/vg0/mysql-data |
I am still searching for a perfect progress bar for DD, I know a dirty trick[*1] – put DD to background an sending “USR1” signal to bring it to show a progress – I hate this solution!
This one is not so dirty, but you have only the done progress and transfer speed.
1 2 | dd if=/opt/wap/Backup.tib | pv | ssh -c arcfour id@tower "dd of=/home/id/Backup.tib" 1.94GB 0:01:15 [30.1MB/s] [<=> |
Dirty trick:
Only local way!
1 2 | dd if=/opt/wap/Backup.tib of=file.img bs=4KB& pid=$! while true; do kill -USR1 $pid && sleep 1 && clear; done |
Each of you looses already some important files like photos or important documents.
After a normal Windows crash it’ s not a problem to get all your data back.
I show you some methods to get your data back.
These two examples are taken directly from the ddrescue info pages.
Example 1: Rescue an ext3 partition in /dev/hda2 to /dev/hdb2
1 2 3 | dd_rescue /dev/hda2 /dev/hdb2 -l logfile.txt e2fsck -v -f /dev/hdb2 mount -t ext3 -o ro /dev/hdb2 /mnt |
If you have a damaged hard disk /dev/sda1 and you have an empty space hard disk /dev/sdb1 You can copy data from /dev/sda1 to /dev/sdb1 use the following commnd
1 2 3 | dd_rescue /dev/sda1 /dev/sda2/backup.img # To mount use: mount -t ext3 /dev/sda2/backup.img mnt/ -o loop |
Example 2: Rescue a CD-ROM in /dev/cdrom
1 | ddrescue -b 2048 /dev/cdrom cdimage logfile |