Skip to main content

Copy Sparse files over network

I have a few physical nodes which I ran KVM guests on.  Occasionally I need to rebuild the host, so I want to copy the VM from one physical node to another.  I use RAW (sparse) disk images and standard scp would copy the image in it's entirety.  Until... I found rsync -S ;-)

rsync -Surpolvv * usgtst92:/var/lib/libvirt/images/

*** SOURCE ***
usgtst91 images]# for IMG in `find . -name "*.img"`; do qemu-img info $IMG; done
image: ./DVGLLVUSGTST82/DVGLLVUSGTST82.img
file format: raw
virtual size: 44G (47244640256 bytes)
disk size: 12G
image: ./DVGLLVUSGTST81/DVGLLVUSGTST81.img
file format: raw
virtual size: 44G (47244640256 bytes)
disk size: 4.0G
image: ./DVGLLVUSGTST83/DVGLLVUSGTST83.img
file format: raw
virtual size: 44G (47244640256 bytes)
disk size: 3.8G

*** DESTINATION ***
usgtst92 images]# for IMG in `find . -name "*.img"`; do qemu-img info $IMG; done
image: ./DVGLLVUSGTST83/DVGLLVUSGTST83.img
file format: raw
virtual size: 44G (47244640256 bytes)
disk size: 3.2G
image: ./DVGLLVUSGTST81/DVGLLVUSGTST81.img
file format: raw
virtual size: 44G (47244640256 bytes)
disk size: 3.4G
image: ./DVGLLVUSGTST82/DVGLLVUSGTST82.img
file format: raw
virtual size: 44G (47244640256 bytes)
disk size: 11G
Labels:

Comments

  1. Chan PKNovember 24, 2017 at 1:16 PM

    This is the simplest, clearest explanation of this topic I have found. Thanks!
    linux scp

    ReplyDelete
  2. digitalhtsJanuary 15, 2021 at 3:11 AM

    Really helpful down to the ground, happy to read such a useful post. I got a lot of information through it and I will surely keep it in my mind. Keep sharing. Otherwise If If any one who want to learn linux core to advance Get a free demo call on 9311002620 or visit https://htsindia.com/Courses/modular-courses/redhat-linux-administration-training-course

    ReplyDelete

Post a Comment

Popular posts from this blog

Sun USS 7100 foo

TIP: put ALL of your LUNs into a designated TARGET and INITIATOR group when you create them.  If you leave them in the "default" group, then everything that does an discovery against the array will find them :-( I'm struggling to recognize a reason that a default should even be present on the array. Also - who, exactly, is Sun trying to kid.  The USS is simply a box.. running Solaris .. with IPMP and ZFS.  Great.  If you have ever attempted to "break-in" or "p0wn" your IBM HMC, you know that there are people out there that can harden a box - then.. there's Sun.  After a recent meltdown at the office I had to get quite intimate with my USS 7110 and learned quite a bit.  Namely: there's a shell ;-) My current irritation is how they attempt to "warn you" away from using the shell (my coverage expired a long time ago to worry about that) and then how they try to hide things, poorly. I was curious as to what version of SunOS it ...
1 comment
Read more

PXE boot a LiveCD image

Summary: I have wanted to build a kickstart environment which hosted a "rescue CD" or LiveCD to allow you to boot over the network after you blew your stuff up and needed to repair a few things.  Today I have worked through a method of doing so, with the help of the people who published a succinct script with the Red Hat Enterprise Virtualization Hypervisor.  (the script will be at the bottom of this post - if I have somehow not followed the GPL, please let me know and I will correct whatever is necessary) NOTE/Warning: The boot will fail due the initrd being too large (645mb).  I'm not sure how to proceed.  This procedure worked for RHEVh, because it is quite a bit smaller.  Hopefully I can report back with progress on this? :-$ Procedure: download your LiveCD image to /export/isos/RESCUE/Fedora-16-i686-Live-Desktop.iso # cd /var/tmp # vi livecd-iso-to-pxeboot (populate the file with the script shown below) # chmod 754 ./livecd-iso-to-pxeb...
2 comments
Read more

MOTD with colors! (also applies to shell profiles)

I'm not sure why I had never looked into this before, but this evening I became obsessed with discovering how to present different colored text in the /etc/motd. A person had suggested creating a shell script (rather than using special editing modes in vi, or something) and I agree that is the simplest way of getting this accomplished quickly. This most noteworthy portion of this script is the following: RESET="\033[0m" that puts the users shell back to the original color. I typically like a green text on black background. Also - a great reference for the different colors and font-type (underscore, etc...) https://wiki.archlinux.org/index.php/Color_Bash_Prompt I found this example on the web and I wish I could recall where so that I could provide credit to that person. #!/bin/bash #define the filename to use as output motd="/etc/motd" # Collect useful information about your system # $USER is automatically defined HOSTNAME=`uname -n` KERNEL=`un...
1 comment
Read more