Aw: Re: link-dest and batch-file

[devzero at web.de]

But don‘t forget —inplace, otherwise snapshots would not be efficient


> Gesendet: Mittwoch, 18. Juli 2018 um 21:53 Uhr
> Von: "Kevin Korb via rsync" <rsync at lists.samba.org>
> An: rsync at lists.samba.org
> Betreff: Re: link-dest and batch-file
>
> If you are using ZFS then forget --link-dest.  Just rsync to the same
> zfs mount every time and do a zfs snapshot after the rsync finishes.
> Then delete old backups with a zfs destroy.
> 
> On 07/18/2018 03:42 PM, Дугин Сергей via rsync wrote:
> > Hello.
> > 
> > I  need  that  during  today's backup, the metadata about the files is
> > saved  in  a  file,  so  that tomorrow when creating a backup with the
> > option  "link-dest" instead of this option I would specify a file with
> > metadata,   then   rsync   will  not  scan  the  folder  specified  in
> > "link-dest",   but  simply  reads  information  about this folder from
> > a  file with  metadata. This greatly saves time and load on the server
> > with backups. 
> > 
> > I  do not delete through rm -rf, but delete the ZFS partition, you can
> > also delete via find -delete, there are other ways
> > 
> > On 26 июня 2018 г., 22:47:56:
> > 
> >> I don't believe there is anything you can do with the batch options for
> >> this.  If you added a --write-batch to each of those you would get 3
> >> batch files that wouldn't be read without a --read-batch.  If you also
> >> did a --read-batch that would contain differences between a backup and
> >> the backup before it so rsync would still have to read the backup before
> >> it to understand the batch (and this would continue on to the oldest
> >> backup making the problem worse).
> > 
> >> Anyway, what you were asking for sounds a lot like rdiff-backup.  I
> >> didn't like it myself but maybe you would.
> > 
> >> BTW, my experience with many millions of files vs rsync --link-dest is
> >> that running the backup isn't a problem.  The problem came when it was
> >> time to delete the oldest backup.  An rm -rf took a lot longer than an
> >> rsync.  If you haven't gotten there yet maybe you should try one and see
> >> if it is going to be as big a problem as I had.
> > 
> >> On 06/26/2018 03:02 PM, Дугин Сергей via rsync wrote:
> >>> Hello.
> >>>
> >>> I am launching a cron bash script that does the following:
> >>>
> >>> Day 1
> >>> /usr/bin/rsync -aH --link-dest /home/backuper/.BACKUP/0000009/2018-06-25 root at 192.168.1.103:/home/ /home/backuper/.BACKUP/0000009/2018-06-26
> >>>
> >>> Day 2
> >>> /usr/bin/rsync -aH --link-dest /home/backuper/.BACKUP/0000009/2018-06-26 root at 192.168.1.103:/home/ /home/backuper/.BACKUP/0000009/2018-06-27
> >>>
> >>> Day 3
> >>> /usr/bin/rsync -aH --link-dest /home/backuper/.BACKUP/0000009/2018-06-27 root at 192.168.1.103:/home/ /home/backuper/.BACKUP/0000009/2018-06-28
> >>>
> >>> and etc.
> >>>
> >>>
> >>> The  backup server experiences a large flow of data when the quantity
> >>> of  files  exceeds  millions, as rsync scans the files of the previous
> >>> day   because   of  the  link-dest  option.  Is it possible to use the
> >>> batch-file   mechanism   in   such  a  way,  so  that  when  using the
> >>> link-dest  option,  the  file  with  the metadata from the current day
> >>> could  the  executed  the  following  day  without  having to scan the
> >>> folder, that is linked in the link-dest?
> >>>
> >>>
> >>> Yours faithfully,
> >>>   Sergey Dugin                       mailto:drug at qwarta.ru
> >>>  QWARTA
> >>>
> >>>
> > 
> > 
> > 
> > 
> 
> -- 
> ~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,
> 	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/
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> ~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,
> 
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