similar to: Copy on write loop block driver

Hello ! Is anybody using cowloop (http://www.atconsultancy.nl/cowloop/) with XEN ? i want to use this for saving diskspace and time for copying rootfs-images. the module compiles and loads fine (was done by a colleague) cowloop - (C) 2005 AT Consultancy/AT Computing cowloop - version: 2.15 cowloop - info: www.ATConsultancy.nl/cowloop cowloop - maximum allowed cowdevices: 16 cowloop -

Has any one had any success with cow implementation in xen ? I found this somewhere http://www.atconsultancy.nl/cowloop/, has anyone tried it out with xen ? -- regards, Anand _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users

Use vector type to store map ranges. Test filenames unique. Remove some unused variables. Break up long lines. --- filters/ddrescue/nbdkit-ddrescue-filter.pod | 6 ++- filters/ddrescue/ddrescue.c | 42 ++++++++++----------- tests/test-ddrescue-filter.sh | 10 ++--- 3 files changed, 29 insertions(+), 29 deletions(-) diff --git

This allows to overlay bad sectors according to the mapfile generated by ddrescue, to then see where sectors are used using fsck and trying to copy files around. Should now be mature enough to be useful to someone else. And we have a proper test also. Signed-off-by: François Revol <revol@free.fr> --- configure.ac | 2 + filters/ddrescue/Makefile.am

This allows to overlay bad sectors according to the mapfile generated by ddrescue, to then see where sectors are used using fsck and trying to copy files around. Signed-off-by: Fran?ois Revol <revol at free.fr> --- configure.ac | 2 + filters/ddrescue/Makefile.am | 75 +++++++ filters/ddrescue/ddrescue.c | 218

This allows to overlay bad sectors according to the mapfile generated by ddrescue, to then see where sectors are used using fsck and trying to copy files around. Signed-off-by: Fran?ois Revol <revol at free.fr> --- configure.ac | 2 + filters/ddrescue/Makefile.am | 75 +++++++ filters/ddrescue/ddrescue.c | 211

On 5/1/20 2:16 PM, Fran?ois Revol wrote: > This allows to overlay bad sectors according to the mapfile generated by > ddrescue, to then see where sectors are used using fsck and trying to > copy files around. > > Signed-off-by: Fran?ois Revol <revol at free.fr> > --- Focusing on just the docs: > +++ b/filters/ddrescue/nbdkit-ddrescue-filter.pod > @@ -0,0 +1,74 @@

Hello, did anyone ever migrated a DomU while using a cowloop as device for its virtual Harddrive? Mattes _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users

On 14/12/17 18:57, Warren Young wrote: > On Dec 13, 2017, at 5:15 PM, J Martin Rushton <martinrushton56 at btinternet.com> wrote: >> >> # dd if=/dev/sdc of=/home/dd-copy-of-sdc > > Better, use ddrescue: > > https://www.gnu.org/software/ddrescue/ > > dd will do unfortunate things like quit early on I/O errors, even if later blocks would read just fine.

If the data is important to you, don't mess around and contact a reputable professional data recovery expert or company. If losing your data is a viable option, try to do it yourself. Otherwise seek professional help, with the data recovery effort of course. On Fri, Dec 15, 2017 at 4:31 AM, J Martin Rushton <martinrushton56 at btinternet.com> wrote: > On 14/12/17 18:57, Warren Young

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 [Please CC me on answers, I'm not subscribed] Hi everyone, I have got a hard disk which was damaged by a fall and would like to recover a few files from that. (There is a backup for most of the data, but a handful of recent files are missing. These are important enough to spend some time on them, but not for paying a professional data recovery

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On 03/02/2017 11:57 PM, Robert Moskowitz wrote: > The following worked: > > # dd if=/dev/sdb of=cubietruck.img bs=512 count=6268927 > > 6268927+0 records in > 6268927+0 records out > 3209690624 bytes (3.2 GB, 3.0 GiB) copied, 114.435 s, 28.0 MB/s > > So bs= IS the drive blocksize. > > This is the result of trying a number of different values for bs and > count.

On Dec 13, 2017, at 5:15 PM, J Martin Rushton <martinrushton56 at btinternet.com> wrote: > > # dd if=/dev/sdc of=/home/dd-copy-of-sdc Better, use ddrescue: https://www.gnu.org/software/ddrescue/ dd will do unfortunate things like quit early on I/O errors, even if later blocks would read just fine. ddrescue assumes the input file is dodgy and tries to cope.

I have a full disk image file (courtesy of ddrescue), and need to mount one of its partitions. I suppose I should have just extracted the single partition when I was using ddrescue, but right now I have the whole disk instead, and no disk space left to re-do the extraction (in fact I won't be able to use the system where I did it for several weeks, so I'd love to be able to mount just the

Fabian Cenedese <Cenedese at indel.ch> wrote: >> rsync: write failed on "/Volumes/durack1ml_bak/160405_1234/Backups.backupdb/durack1ml/2016-02-10-091749/durack1ml_hdd/Applications/Adobe Media Encoder CC 2015/Adobe Media Encoder CC 2015.app/Contents/Resources/pdfl/CMaps/ETen-B5-UCS2": Result too large (34) > Are you sure that the problem is with the corrupted source data?

Well, I'm not a noted expert on ddrescue, but my limited experience tells me that when it hits bad spots (or a big cluster of them) it can go very slowly as it tries multiple times to read each sector (or track, I'm not sure which, in this case). It keeps a list of bad spots and goes back at the end to try again to read something from them. Of course, if you've had, eg. a head crash,

Eric: Even though it's only been about 2 months, we have a very good feature set for nbdkit 1.20. Is there anything you'd like to get in or any patches I have missed? Francois: you mentioned the ddrescue filter yesterday. While I don't want to put in a new filter right before we do a release (new features need to sit around in development so we can uncover bugs), if you do have

A few fixes and a possible enhancement to the ddrescue filter. If you think these are all OK, I will squash it into your patch and push it. Rich.

The context to this is that nbdkit uses sscanf to parse simple file formats in various places, eg: https://github.com/libguestfs/nbdkit/blob/b23f4f53cf71326f1dba481f64f7f182c20fa3dc/plugins/data/format.c#L171-L172 https://github.com/libguestfs/nbdkit/blob/b23f4f53cf71326f1dba481f64f7f182c20fa3dc/filters/ddrescue/ddrescue.c#L98 We can only do this safely where we can prove that overflow does not