FBSD 5.1 and 4.8 sharing the same /home (and /var) possible?
Stefan A. Deutscher
sa.deutscher at tiscali.de
Sat Nov 22 01:27:45 PST 2003
I have a 5.1R install working and would like to keep a fall-back 4.8R
on my system as well. From both, I want to be able to use the same
/home, /scratch, and, possibly, /var or at least /var/mail to avoid
duplication of mail. To be nice on my disks, I also ponder sharing swap
space such that the system does not swap to its own system disk (i.e.
5.1R would swap to da0, da2 and da3, 4.8R to da0, da1 and da3) - this
seems to work. The rough disk layout is
da0 - OS/2
da1 - BSD 5.1R /
BSD 5.1R swap
BSD 5.1R /tmp
BSD 5.1R /var
BSD 5.1R /usr
da2 - BSD 4.8R /
BSD 4.8R swap
BSD 4.8R /tmp
BSD 4.8R /var
BSD 4.8R /scratch
BSD 4.8R /usr
da3 BSD 5.1R swap
BSD 5.1R /home (63 GB)
Maybe I'll add another 18 or 36 GB disk for /scratch and /backup space.
Now, as per default, the 5.1R install uses ufs2 throughout, the 4.8 one
ufs1. Poking around google I am led to believe that this is not free of
potential for trouble. So, here are my questions, before shooting myself
in the foot
(a) Is it OK to have the slices to be shared on ufs2, or will 4.8R
wreck havoc when accessing those (or, better: just not be able to
(b) If ufs2 is not OK for use on both systems, are there any things to
consider when making them ufs1? I suppose I would have to backup,
newfs -O1, and restore the /var slice on da1, or is it advisable to
just make /var/mail a symlink to some separate ufs1 /mail slice?
(c) Will the background file system checks introduced with 5.x still
work on these ufs1 slices?
Any thoughts, warings, pointers & hints are most welcome!
Thanks in advance & cheers,
Stefan A. Deutscher |
Donostia International Physics Center | office: ++34-943-018174
Universidad del Pais Vasco, Facultad de Quimica | fax : ++34-943-015600
Departamento de Fisica de Materiales | home : ++34-943-270647
Apartado 1072, San Sebastian 20080, Spain | email : sad at mailaps.org
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