Downgrade FreeBSD 5.1 or 5.2 -> 4.9
david at catwhisker.org
Thu Jan 22 11:44:01 PST 2004
>Date: Thu, 22 Jan 2004 11:33:10 -0800
>From: John Kennedy <jk at jk.homeunix.net>
>To: freebsd-current at freebsd.org
>Subject: Re: Downgrade FreeBSD 5.1 or 5.2 -> 4.9
>Sender: owner-freebsd-current at freebsd.org
> Will 4.x and 5.x play nice if they have a partition (slice?) in common?
They can (play nice), yes.
It helps to use UFS1 file systems. :-}
> For example, /home that was mounted by both a 4.x and 5.x depending on
>whatever was booted at the moment. Probably have UFS issues, but I don't
>know if 5.x will "corrupt" a 4.x filesystem.
On my laptop, on which I have been tracking both -STABLE and -CURRENT
for quite a while, /home is a symlink (for each bootable /) to
/common/home. Here is how things look while running -STABLE:
localhost(4.9-S) df -k
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/ad0s1a 161262 47614 100748 32% /
mfs:24 515606 16 474342 0% /tmp
/dev/ad0s1e 1902528 1084144 666182 62% /usr
/dev/ad0s2a 161262 77676 70686 52% /S2
/dev/ad0s2e 1902528 1016476 733850 58% /S2/usr
/dev/ad0s3a 161262 78218 70144 53% /S3
/dev/ad0s3e 1899102 1014676 732498 58% /S3/usr
/dev/ad0s3f 1016303 26938 908061 3% /var
/dev/ad0s3g 10163268 8736126 614081 93% /common
/dev/ad0s3h 16531530 994612 14214396 7% /bkp
procfs 4 4 0 100% /proc
While running -CURRENT, I boot from ad0s3a, and I don't mount anything
(by default) from slice 1 or 2. ad0s3f gets mounted on /var, ad0s3g
gets mounted on /common, and ad0s3b is used as swap (with a swap-backed
/tmp) in all cases.
> I downgraded via reinstall once, but set up two partitions so I could
>work on either one if I wanted to. I haven't tried mix-n-match though.
There was a problem a while back, when -STABLE's fsck was unhappy with
the way -CURRENT's fsck left things. That was quite a while back,
though, and was fixed fairly quickly.
David H. Wolfskill david at catwhisker.org
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