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Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!msuinfo!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!europa.eng.gtefsd.com!uhog.mit.edu!grapevine.lcs.mit.edu!ginger.lcs.mit.edu!wollman From: wollman@ginger.lcs.mit.edu (Garrett A. Wollman) Newsgroups: comp.os.386bsd.questions Subject: Re: Are FreeBSD 1.1.5.1 and 2.0 ufs filesystems compatible? Date: 2 Dec 1994 03:25:11 GMT Organization: MIT Laboratory for Computer Science Lines: 34 Message-ID: <3bm42n$7lk@GRAPEVINE.LCS.MIT.EDU> References: <3blt5d$sui@shore.shore.net> NNTP-Posting-Host: ginger.lcs.mit.edu In article <3blt5d$sui@shore.shore.net>, Robert Withrow <witr@rwwa.com> wrote: >Ca I just use my 1.1.5.1 file systems on 2.0, and my 2.0 filesystems >on 1.1.5.1, or is that a no-no. Yes and no. [Takes off his Chris Torek mask...] The clean bit processing in 2.0 will result in fsck complaining about your superblock. However, you can safely ignore this error, because the 1.1.5 kernel doesn't notice it. By contrast, the lack of clean bit processing in 1.1.5 will cause the 2.0 fsck to complain. The above only applies to 4.2-compatible (``version 1'') FFS filesystems, such as those originally newfs'ed by FreeBSD 1.x and not later converted. If you have a ``version 2'' FFS filesystem, such as is the default under FreeBSD 2.0, while the kernel will be able to read it just fine (except for symbolic links which have changed in format between the versions), fsck will be unable to make any sense out of it. >If it is a no-no, how do I convert my 5 disks from one to the other? fsck -c2 /dev/device # convert to version 2 fsck -c1 /dev/device # convert to version 1 - untested However, this is an extremely invasive operation, and we don't take any responsibility for fsck screwing up your data in the process. -GAWollman -- Garrett A. Wollman | Shashish is simple, it's discreet, it's brief. ... wollman@lcs.mit.edu | Shashish is the bonding of hearts in spite of distance. Opinions not those of| It is a bond more powerful than absence. We like people MIT, LCS, ANA, or NSA| who like Shashish. - Claude McKenzie + Florent Vollant