Date: Sun, 12 Mar 2006 11:06:02 -0500 From: Mike Jeays <mj001@rogers.com> To: Andrew Pantyukhin <infofarmer@gmail.com> Cc: Wojciech Puchar <wojtek@tensor.3miasto.net>, freebsd-questions@freebsd.org, Grant Peel <gpeel@thenetnow.com> Subject: Re: dd - cloning a disk. Message-ID: <1142179562.2093.85.camel@chaucer.jeays.ca> In-Reply-To: <cb5206420603120553y4c69ff5cx293539bbf1ad4251@mail.gmail.com> References: <001901c64517$9d891950$6701a8c0@GRANT> <44138FC9.30900@daleco.biz> <20060312105141.K18712@chylonia.3miasto.net> <cb5206420603120553y4c69ff5cx293539bbf1ad4251@mail.gmail.com>
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On Sun, 2006-03-12 at 16:53 +0300, Andrew Pantyukhin wrote: > On 3/12/06, Wojciech Puchar <wojtek@tensor.3miasto.net> wrote: > > > > > > It is, with a few 'buts'. Firstly, the source should be mounted > > > > but may not - unless system is generally idle. fsck will be checking the > > copy then, but with success. > > No matter what fsck says later, it's too dangerous. A FreeBSD > system (as well as any other complicated OS) is never really > idle in terms of disk I/O. > > > On 3/12/06, Wojciech Puchar <wojtek@tensor.3miasto.net> wrote: > > > list sometime in the last 3-5 weeks. Giorgios Keramidas > > > commented that "dd" was too slow for his tastes and > > > > dd is the fastest, but probably he used small block size. 64K is OK > > dd can be slower than dump/restore in quite a few cases, > especially when disk is far from full. > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" I have done this 'safely', by booting Knoppix, and using dd to copy the disk in the knowledge that all the UFS filesystems are closed and clean. Use a large blocksize; you can go a lot bigger than 64K. -- Mike Jeays http://ca.geocities.com/mike.jeays@rogers.com
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