Date: Mon, 18 Nov 2002 08:48:49 -0600 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> Subject: Re: restore question Message-ID: <3.0.5.32.20021118084849.01159fc8@mail.sage-one.net> In-Reply-To: <3.0.5.32.20021118082557.01159fc8@mail.sage-one.net> References: <Pine.GSO.4.44.0211161302290.22224-100000@mail.ilrt.bris.ac .uk> <3.0.5.32.20021115091500.010abd98@mail.sage-one.net>
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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
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