Aw: Re: Re: rsync remote raw block device with --inplace

[devzero at web.de]

maybe this could also be useful:

https://github.com/RyanHow/block2file


> Gesendet: Sonntag, 30. Dezember 2018 um 22:52 Uhr
> Von: "Rolf Fokkens via rsync" <rsync at lists.samba.org>
> An: rsync at lists.samba.org
> Betreff: Re: Aw: Re: rsync remote raw block device with --inplace
>
> It was broucht up before indeed: 
> https://lists.samba.org/archive/rsync/2012-June/027680.html
> 
> On 12/30/18 9:50 PM, devzero--- via rsync wrote:
> >> There have been addons to rsync in the past to do that but rsync really
> >> isn't the correct tool for the job.
> > why not correct tool ?
> >
> > if rsync can greatly keep two large files in sync between source and destination
> > (using --inplace), why should it (generally spoken) not also be used to keep two
> > blockdevices in sync ?
> >
> > maybe these links are interesting in that context:
> >
> > https://lists.samba.org/archive/rsync/2010-June/025164.html
> >
> > https://github.com/dop251/diskrsync
> >
> > roland
> >
> >> Gesendet: Sonntag, 30. Dezember 2018 um 19:53 Uhr
> >> Von: "Kevin Korb via rsync" <rsync at lists.samba.org>
> >> An: rsync at lists.samba.org
> >> Betreff: Re: rsync remote raw block device with --inplace
> >>
> >> There have been addons to rsync in the past to do that but rsync really
> >> isn't the correct tool for the job.  Neither is dd.
> >>
> >> The right tool is something that understands the filesystem within the
> >> block device such as ntfsclone (what I use) or partimage (if you have
> >> ever used Clonezilla this is what it uses).  These will know how to skip
> >> all the empty parts of the filesystem and will still be capable of
> >> restoring a complete image in a bare metal restore.  You can still use
> >> dd to snag a copy of the MBR since that is outside of any filesystems.
> >>
> >> Also, if you do have to resort to a plain image use ddrescue instead of
> >> dd.  It has a status screen and it can resume as long as you used a log
> >> file when you ran it.
> >>
> >> On 12/30/18 1:45 PM, Steve Newcomb via rsync wrote:
> >>> It would be very nice to be able to rsync the raw data content of, e.g.,
> >>> a non-mounted disk partition, particularly in combination with --inplace.
> >>>
> >>> Our reality: several dual-boot machines running Windows during the day
> >>> and Linux at night, during backups.  Windows is very tedious and iffy to
> >>> re-reinstall without a raw disk image to start from.  Disks fail, and
> >>> the ensuing downtime must be minimized.
> >>>
> >>> We're using dd for this.  Most of the nightly work is redundant and
> >>> wasteful of elapsed time and storage.  Storage is cheap, but it's not
> >>> *that* cheap.  Elapsed time is priceless.
> >>>
> >>> Rsync refuses to back up raw devices, and even raw character devices,
> >>> with the message "skipping non-regular file" (I think the relevant
> >>> message is in generator.c).
> >>>
> >>> In Linux, anyway, the "raw" command allows a block device to be bound as
> >>> a character device, and then even a "cat" command can read the raw data
> >>> of the block device.  So why does rsync refuse to copy such content, or
> >>> why is it a bad idea, or what rsync doctrine conflicts with it?  I agree
> >>> there are security concerns here, but rsync already disallows some of
> >>> its functions unless the super user is requesting them.
> >>>
> >>>
> >> -- 
> >> ~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,
> >> 	Kevin Korb			Phone:    (407) 252-6853
> >> 	Systems Administrator		Internet:
> >> 	FutureQuest, Inc.		Kevin at FutureQuest.net  (work)
> >> 	Orlando, Florida		kmk at sanitarium.net (personal)
> >> 	Web page:			https://sanitarium.net/
> >> 	PGP public key available on web site.
> >> ~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,
> >>
> >> -- 
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