Jelle de Jong
2017-Jan-10 16:06 UTC
[Libguestfs] ntfs-3g data deduplication support in guestmount for creating file based back-ups on visualization platform
Hello everybody, I am using libguestfs-tools version 1.28.1 in a bunch of bash scripts to make back-ups of the files on a visualisation platform. I been trying to get read access to ntfs volumes with data deduplication working. The ntfs-3g guys developed some support and I have this working when using the commands our back-up servers. However when using the guestmount tool the read suport foor dedub is gone. See this email for all the commands I use (working mount -t ntfs and non-working guestmount commands). https://sourceforge.net/p/ntfs-3g/mailman/message/35595392/ How can I see what version of ntfs-3g is used in guestmount and if it is using the /usr/lib/x86_64-linux-gnu/ntfs-3g/ntfs-plugin-80000013.so plugin that is on my back-up server? Thank you in advance! Kind regards, Jelle de Jong
Richard W.M. Jones
2017-Jan-16 14:29 UTC
Re: [Libguestfs] ntfs-3g data deduplication support in guestmount for creating file based back-ups on visualization platform
On Tue, Jan 10, 2017 at 05:06:13PM +0100, Jelle de Jong wrote:> Hello everybody, > > I am using libguestfs-tools version 1.28.1 in a bunch of bash > scripts to make back-ups of the files on a visualisation platform. > > I been trying to get read access to ntfs volumes with data > deduplication working.Do you have more information about data deduplication? It's the first I've heard of it for NTFS (or indeed any ordinary Unix filesystem). In fact I thought it was a feature of the block layer rather than the filesystem. But anyway ...> The ntfs-3g guys developed some support and I have this working when > using the commands our back-up servers. > > However when using the guestmount tool the read suport foor dedub is gone.This is maybe not especially surprising. A lot of layers have to work correctly in order for a feature to be passed through guestmount. You've got (at least) kernel+FUSE on the host side (for guestmount), the libguestfs API, the appliance kernel, and ntfs-3g in the appliance. Getting discard support working involved a considerable effort.> See this email for all the commands I use (working mount -t ntfs and > non-working guestmount commands). > > https://sourceforge.net/p/ntfs-3g/mailman/message/35595392/ > > How can I see what version of ntfs-3g is used in guestmount and if > it is using the > /usr/lib/x86_64-linux-gnu/ntfs-3g/ntfs-plugin-80000013.so plugin > that is on my back-up server?Probably helpful to refer to the diagram here: http://libguestfs.org/guestfs-internals.1.html ntfs-3g in your case is running in the "appliance" box in that diagram. The plugin file *should* be copied into the appliance, assuming that it's part of the Debian ntfs-3g package and the Debian ntfs-3g package isn't doing anything weird. You can easily check using virt-rescue: $ virt-rescue --ro -a windows.img ><rescue> ls -l /usr/lib/x86_64-linux-gnu/ntfs-3g/ ><rescue> mount /dev/sda1 /sysroot (and then use whatever ntfs commands are needed to check that the plugin is being used) Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 100 libraries supported. http://fedoraproject.org/wiki/MinGW
Jelle de Jong
2017-Jan-16 15:20 UTC
Re: [Libguestfs] ntfs-3g data deduplication support in guestmount for creating file based back-ups on visualization platform
Thank you Richard! I will do some more work and testing on this tomorrow, and report back with some more information you asked. In the meanwhile, could you help me with information how I can upgrade the ntfs-3g version (same as host) in the "appliance" and add the plug-in library? On 16/01/17 15:29, Richard W.M. Jones wrote:> The plugin file *should* be copied into the appliance, assuming that > it's part of the Debian ntfs-3g package and the Debian ntfs-3g package > isn't doing anything weird.The plug-in is added manually and is not part of the ntfs-3g (yet), it is manually downloaded and copied. Thank you in advance! Kind regards, Jelle de Jong
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