Date: Mon, 18 Nov 2002 16:33:42 -0800 From: "Grant" <grant.cooper@nucleus.com> Cc: "freebsd-questions" <freebsd-questions@FreeBSD.ORG> Subject: Re: restore question Message-ID: <015c01c28f63$4ffead20$4569cecd@donatev49iknkl> References: <Pine.GSO.4.44.0211161302290.22224-100000@mail.ilrt.bris.ac .uk> <3.0.5.32.20021115091500.010abd98@mail.sage-one.net> <3.0.5.32.20021118084849.01159fc8@mail.sage-one.net>
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You guys mentioned earlier that if you are able to you should dump from single user mode. No one ever talks about booting off the fixit CD. Wouldn't that improve your chances of a successful backup because you would be minimizing file changes. In Root you are still running off the / correct? ----- Original Message ----- From: "Jack L. Stone" <jackstone@sage-one.net> To: "Jan Grant" <Jan.Grant@bristol.ac.uk> Cc: "Mark" <admin@asarian-host.net>; "freebsd-questions" <freebsd-questions@FreeBSD.ORG> Sent: Monday, November 18, 2002 6:48 AM Subject: Re: restore question > At 08:25 AM 11.18.2002 -0600, 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. > > > > "....Dump is the only backup program recommended by the Handbook as being > safe..." > > Pardon me. That should have been "....as being safe to move whole > filesystems....." Not a condemnation of other programs. > > Best regards, > Jack L. Stone, > Administrator > > SageOne Net > http://www.sage-one.net > jackstone@sage-one.net > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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