8.0 can't find/read label on da3 (7.2 OK)

[Johan Hendriks]

>This morning I source-upgraded our main server (i386) from 7.2-RELEASE
to this morning's RELENG_8_0.  FreeBSD 8.0 >seems unable to discover the
filesystem on /dev/da3.  The earlier discs (da0, da1, da2) on that
controller are fine.

>If I boot 7.2-RELEASE from a live CD, bsdlabel happily reads the /da3s1
label, I can fsck the da3s1d UFS filesystem, >and I can mount the
filesystem.  If I boot 8.0, I lose the disc again.

This is probably a dangerous dedicated disk made on 7.x

I had this issue also and some member of the list gave me this hint:

!!!!!!!!!!!!!!DO MAKE A BACKUP OF YOUR DATA BEFORE DOING THIS FROM YOUR
7.2 INSTALL !!!!!!!!!!!!!!!!!!!


Is your disk in "dangerously dedicated" mode?

If yes, this is what I did (advised by marcel@)

dd if=/dev/zero of=/dev/ad1 oseek=1 bs=512 count=1

where /dev/ad1 is my device. You should see some messages from
GEOM_LABEL removing and assigning new labels.



This worked for me, i do not know if it will work for you.

Regards,
Johan Hendriks