I'm calculating checksums over partitions just by calling # md5sum /dev/sda1 or for the complete disk (incl. partition table + all partitions) # md5sum /dev/sda
that's it :) - works with any distro/liveDVD -- Cheers, Manuel Klemenz On Saturday 05 June 2010 21:23:31 meino.cra...@gmx.de wrote: > 7v5w7go9ub0o <7v5w7go9u...@gmail.com> [10-06-05 20:22]: > > On 06/05/10 02:39, meino.cra...@gmx.de wrote: > > [] > > > > > Is there any faster and reliable way to checksum whole paritions (not > > > on "per file" base)??? > > > > FWIW, portage has a tool called "dcfldd" that works well for me. It is > > > > dd with the addition of: > > * Hashing on-the-fly - dcfldd can hash the input data as it is > > > > being transferred, helping to ensure data integrity. > > > > * Status output - dcfldd can update the user of its progress in > > > > terms of the amount of data transferred and how much longer operation > > will take. > > > > * Flexible disk wipes - dcfldd can be used to wipe disks quickly > > and > > > > with a known pattern if desired. > > > > * Image/wipe Verify - dcfldd can verify that a target drive is a > > > > bit-for-bit match of the specified input file or pattern. > > > > * Multiple outputs - dcfldd can output to multiple files or disks > > at > > > > the same time. > > > > * Split output - dcfldd can split output to multiple files with > > more > > > > configurability than the split command. > > > > * Piped output and logs - dcfldd can send all its log data and > > > > output to commands as well as files natively. > > > > > > e.g. when I copy my HD, I get a copy status report and hash by using the > > following commands: > > > > #!/bin/bash > > dcfldd if=/dev/sda bs=4096k sizeprobe=if status=on hashwindow=0 > > of=/dev/sdb dcfldd if=/dev/sdb bs=4096k sizeprobe=if status=on > > hashwindow=0 of=/dev/null > > > > When they've completed, I'll visually compare the two hashes (you can > > automate this.) You can get fancier and do the Verify instead of the > > hashes. > > > > HTH > > > > (p.s. Part of your answer is setting the best blocksize for dd or > > dcfldd. > > > > I'd presume it the smaller of your available memory, or the buffer size > > on your HD?...... someone please correct me on this!?) > > That looks really interesting. The only problem I have with this is > that I have to have /dev/sda as /dev/sdb idle (not mounted) and > because of that I use knoppix as temporary system to boot. And I > dont think that knoppix has this tool "on board". > > Or is there a way to do such copies from a one disk to another > while one disk is booted??? > > Best regards, > mcc
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