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From: John Baldwin <jhb@freebsd.org>
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Cc: grarpamp <grarpamp@gmail.com>
Subject: Re: NFS - DNS fail stops boot in mountlate
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On Thursday, January 06, 2011 2:26:10 pm grarpamp wrote:
> RELENG_8.
> 
> ### setup
> mount -d -a -l -v -t nfs
> exec: mount_nfs -o ro -o tcp -o bg -o nolockd -o intr 192.168.0.10:/tmp /mnt
> exec: mount_nfs -o ro -o tcp -o bg -o nolockd -o intr foo:/tmp /mnt
> 
> 192.168.0.10 has been unplugged, no arp entry.
> Host foo not found: 3(NXDOMAIN)
> 
> ### result
> mount -v 192.168.0.10:/tmp ; echo $?
> [tcp] 192.168.0.10:/tmp: RPCPROG_NFS: RPC: Port mapper failure - RPC: Timed 
out
> mount_nfs: Cannot immediately mount 192.168.0.10:/tmp, backgrounding
> /dev/ad0s1a on / (ufs, local, read-only, fsid <snip1>)
> 0
> 
> [this is ok.]

I've seen a regression in 8 at work where NFS mounts seem to fail on DNS on 
every boot (we have a small number of mounts, < 10) whereas 7 worked fine on 
every boot.  I haven't tracked it down yet, but 8 is certainly more fragile 
than 7 for mounting NFS on boot.

-- 
John Baldwin