Date: Thu, 13 Jan 2000 12:00:22 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net> Cc: ntakpe@ffab.tide.ti.com (Jean Louis Ntakpe), dwmalone@maths.tcd.ie (David Malone), mb@imp.ch, current@FreeBSD.ORG Subject: Re: move portmap(8) from /usr/sbin to /sbin Message-ID: <200001132000.MAA82890@apollo.backplane.com> References: <200001130541.VAA31067@gndrsh.dnsmgr.net>
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:> Sometimes we just want to nfs-mount things on the same
:> machine.
:
:Sick, poor in performance and the wrong tool for the job.
:See mount_null(8) for more details on how to do it right.
:
:>
:> One more example: I don't like /var/news so I mount locally
:> /var/news
:> to /archive/news on the same system instead of using
:> symlinks.
:> My rc.local manages it for me.
:
:Sick. See above.
I gotta agree, this is sick. But to put the icing on the cake: LOCAL
NFS MOUNTS CAN LEAD TO LOW-MEMORY DEADLOCKS. Even with my recent fixes
to -current there is still a non-zero chance of this happening.
The best way to handle a mutual-export/import situation is to
physically mount your disks in this type of directory structure:
machine A: 'lander'
machine B: 'apollo'
/lander/u1
/lander/u2
/lander/u3
/apollo/u1
/apollo/u2
/apollo/u3
On lander the local partitions u1, u2, and u3's mount points are
hard mounted on /lander/u{1,2,3} and apollo's local disks are NFS
mounted on lander in /apollo/u{1,2,3}.
On apollo the /lander partition contains NFS mounts from lander's
u{1,2,3} and apollo's local drives are hard mounted directoy onto
/apollo/u{1,2,3}.
It couldn't be simpler. If you want standard system places to point
to some of these partitions, you simply make the standard system places
softlinks to the appropriate /host/partition directory.
-Matt
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