Date: 03 Oct 2005 15:03:12 -0400 From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> To: <freebsd-questions@freebsd.org> Subject: Re: About SnapShot Message-ID: <44u0fyl8y7.fsf@be-well.ilk.org> In-Reply-To: <auto-000411799344@doruk.net.tr> References: <auto-000411799344@doruk.net.tr>
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"Vahric MUHTARYAN" <vahric@doruk.net.tr> writes: > Today I try to learn snapshot with FreeBSD 5.4 , perfect it's > working very fest . I wonder something if somebody have knowledge about > snapshot or have a documentation about it I will be happy. Did you read the relevant sections of "man mount"? > First I don't understand How system can take snapshot quickly I tried it on > new installed freebsd 5.4 and when I gave a command on console snapshot file > created in a second which 256MB , I wonder How fast will be on bigger > partitions. Anybody know How snapshot tecnology is working ? Because it's > creating an single file and it's 256 mb , it's not possible to copy /var > folder to another folder in a second ... Making a snapshot doesn't make copies of the files. They will only be copied if a new version is created in the real filesystem. This is called "copy on write". Technical documentation is probably at http://www.mckusick.com/softdep/ > Second Why I can't create snapshot file on different directory , I tried to > linking but it didn't work ! AS "man mksnap_ffs" says, "The snapshot_name argument must be contained within the file system mounted at mountpoint." > And anyway Does it possible to back from snapshot file to original portion > ... I mean snapshot is creating only one file When I want to backI have to > mount it to system and copy back files Im asking without copying something > and mouting snapshot file can I make a restore ? No, that isn't possible.
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