Date: Mon, 3 Jan 2005 13:03:59 -0600 From: Eric F Crist <ecrist@secure-computing.net> To: infofarmer@mail.ru Cc: FreeBSD-Questions Questions <freebsd-questions@freebsd.org> Subject: Re: Backup with dd? Message-ID: <39A542A8-5DBA-11D9-B56F-000D9333E43C@secure-computing.net> In-Reply-To: <41D992FF.9070204@mail.ru> References: <F3972A63-5DB0-11D9-B56F-000D9333E43C@secure-computing.net> <200501031215450764.8ED18007@mail.intradyn.com> <0956A4C4-5DB5-11D9-B56F-000D9333E43C@secure-computing.net> <41D992FF.9070204@mail.ru>
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--Apple-Mail-7--229695505 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; format=flowed On Jan 3, 2005, at 12:46 PM, Andrew P. wrote: > Eric F Crist wrote: >> On Jan 3, 2005, at 12:15 PM, Henry Miller wrote: >>> >>> This might work, but it isn't best. I can think of the following >>> objections: >>> >>> You have no protection at all while the copy is in progress. You >>> have >>> overwritten part of the old backup, but not enough to be consistent. >>> >>> You have made no provision for data loss because of anything other >>> than >>> a failing drive. If your house burns down you can't get your data. >>> (not strictly true, you can recover accidently deleted files so long >>> as >>> you do the undelete before the next time you do the backup) >>> >>> FreeBSD has a few different RAID options. With the right setup you >>> can achieve disk reliability, and not have to switch cables on >>> reboot. >> You seem to be under the impression that I'm doing this for the sole >> reason of a disk crash. I'm actually doing it for more than just >> that reason. For example, if my system gets hacked, most hackers >> will probably not care about an unmounted hard drive, and screw with >> the current mounted partitions. Also, these drives wouldn't really >> be at the same point of this hypothetical drive failure, since one >> hard drive will only be used roughly once a week, while the other is >> in a constant state of use. Most of my user-data is destined for a >> RAID-5 array that's roughly 1.2TB, so that's got it's own backup. >> This is simply for use in an emergency, so I don't HAVE to rebuild. >> Quite frankly, I don't have time to sit here and rebuild this system >> again any time soon. This configuration I'm trying is ideal, with >> minimal interference. I'm going to be installing removable drive >> bays so that my roommate is able to simple swap drive positions and >> reboot the system (it's headless, and he's not very tech savvy in >> this regard). > > Backing up with dd is ultimately straightforward, but is not a good > idea at all. The matter is when dd is running, the source may be > modified and the copy might be inconsistent. Software RAID should be > the best option for your task: you can mirror a drive to a second one > and then just plug the second one out of your computer. > > Best wishes, > Andrew P. Is this vinum? Fairly difficult to setup, or is it straight-forward? Before I delve into that, any setup recommendations? Thanks. _______________________________________________________ Eric F Crist "I am so smart, S.M.R.T!" Secure Computing Networks -Homer J Simpson --Apple-Mail-7--229695505 content-type: application/pgp-signature; x-mac-type=70674453; name=PGP.sig content-description: This is a digitally signed message part content-disposition: inline; filename=PGP.sig content-transfer-encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (Darwin) iEYEARECAAYFAkHZlx8ACgkQRAAY9knOW+rDzwCbBIf/h7WIeBex8LHv1uSrot/2 CjQAmwePKLGmGGYzDVS0zOSGSBJJUTyn =GpA6 -----END PGP SIGNATURE----- --Apple-Mail-7--229695505--
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