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Re: [zfs-discuss] Deletion of file from ZFS Disk and Snapshots

Subject: Re: [zfs-discuss] Deletion of file from ZFS Disk and Snapshots
From: Simon Breden
Date: Tue, 13 May 2008 07:15:33 PDT
OK, I understand.

I don't think it's possible though, as snapshots are read only, as far as I 
know.
If you like voodoo you could try going into the .zfs directory, then into the 
snapshot directory and see what you can do there, but I wouldn't try it, as it 
might be possible to do harm that way.

Instead, perhaps you could:

1. do a full backup from the initial snapshot, then do incremental backups from 
the subsequent snapshots, if they are any. This should give you a file system 
containing all of the files in the current snapshots. 

2. Then you could delete the file you want to remove, but this will cause some 
snapshots to take ownership of this deleted file.

Here is an example of how to make a backup of all the data from the snapshots 
to a new file system. Once done, you can see about deleting the file:

zfs send pool/fs@1 | zfs recv pool/newfs  (full initial backup)
zfs send -i pool/fs@1 pool/fs@2 | zfs recv -F pool/newfs (inc. backup between 
snaps 1 and 2)
zfs send -i pool/fs@2 pool/fs@3 | zfs recv -F pool/newfs (inc. backup between 
snaps 2 and 3)
zfs send -i pool/fs@3 pool/fs@4 | zfs recv -F pool/newfs (inc. backup between 
snaps 3 and 4)
etc for each snapshot until you have done all the snapshots

rm /pool/newfs/file_you_want_to_delete

I think there's probably a quicker way using a snapshot range, but I didn't try 
that yet.

I actually wrote up some stuff on snapshots and full & incremental backups 
yesterday. |f it's useful for you, I don't know :)

See: 
http://breden.org.uk/2008/05/12/home-fileserver-zfs-snapshots/
http://breden.org.uk/2008/05/12/home-fileserver-backups-from-zfs-snapshots/

Good luck, and let us know if you manage to make it work.
 
 
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