There was a nice summary describing the use of cachefs under Solaris 2.3
from caywood@teb.larc.nasa.gov (John Caywood) on 20th Jan on this newsgroup.
One of the things stated in the message was that the cachefs cannot be used
for /usr. This is NOT true (even if Sun say it cannot be done it seems to
work just fine). I agree it doesn't work during startup but any time after
the system has booted a command such as the following overlay mounts /usr
(eg. from a script in /etc/rc3.d)
mount -O -F cachefs -o ro,backfstype=nfs,cachedir=/export/cache/cache1 hyacinthus:/export/exec/Solaris_2.3_sparc.all/usr /usr
The important option seems to be -O so that it can hide the /usr mount
point used during booting.
Is there some reason why I shouldn't do this that will make me regret it?
It certainly eliminates the NFS READs leaving just the GETATTRs quite
nicely (once the cache has run for a bit).
any comments?
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