Date: Mon, 18 Nov 2002 15:34:31 +0000 (GMT) From: Jan Grant <Jan.Grant@bristol.ac.uk> To: "Jack L. Stone" <jackstone@sage-one.net> Cc: Mark <admin@asarian-host.net>, freebsd-questions <freebsd-questions@FreeBSD.ORG> Subject: Re: restore question Message-ID: <Pine.GSO.4.44.0211181533370.22577-100000@mail.ilrt.bris.ac.uk> In-Reply-To: <3.0.5.32.20021118082557.01159fc8@mail.sage-one.net>
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On Mon, 18 Nov 2002, Jack L. Stone wrote: > At 01:04 PM 11.16.2002 +0000, Jan Grant wrote: > >On Fri, 15 Nov 2002, Jack L. Stone wrote: > > > >> I missed this earlier. You say: > >> > >> "That is why the only clean way of doing this, would be to make a > >> disk-image, like Ghost does." > >> > >> I'm unaware of any backup that takes longer than a nanosecond where files > >> will not have changed on a system by the time you are done making an image. > >> Does Ghost sync the files again at the end of the backup....??? I am not > >> anti-Ghost, just pro-dump/retore and dd after that and tar after that...... > >> because I feel I can trust them with my data. > > > >Dump is NOT guaranteed to work taking an image of a live filesystem. If > >you want this behaviour, you're better off creating a filesystem > >snapshot and using your favourite backup mechanism on that. There are no > >plans that I'm aware of to move the FS snapshotting code into 4-STABLE. > > > >jan > >-- > > Your comments take the thread out of context and moves far from the > original post. I never have said that ANY backup of a live filesystem > should be considered safe from corruption. See the word "nanosecond". > > However, to resond, if one has the luxuary of dropping down to single user > (to reduce file changes and possible file corruption) and then doing a > dump, the integrity of the backup should be reliable. Dump is the only > backup program recommended by the Handbook as being safe and has stood the > test of time. I cannot have the server down on a frequent basis, so I do > dumps daily on live systems. Have used them on occasion to restore and so > far, every one has worked fine.....including being bootable. > > Now, the original question was about the existance of a "Ghost-like" > program to duplicate one HD to another. My observation was that dd(1) is > the closest thing I know about and it's in the base system. BTW, I've also > used dd(1) in a pinch and every case has worked fine there too.... booted > right up and never any indication of a problem. I congratulate you on your luck. -- jan grant, ILRT, University of Bristol. http://www.ilrt.bris.ac.uk/ Tel +44(0)117 9287088 Fax +44 (0)117 9287112 http://ioctl.org/jan/ New Freedom of Information Act: theirs, to yours. Happy now? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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