NFS installworld failures

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Greetings,

Am I the only one attempting to maintain a local cluster using
a buildworld server and mounting /usr/src/ and /usr/obj/ via NFS?

I intermittently run into installworld failures, usually
in sys/boot/i386 but occasionally e.g. cddl/lib where the
install targets are apparently out of date, and want to be
rebuilt, which doesn't work with a read-only mount.

Is this a reasonable thing to expect to work, or maybe not?

Every system in the cluster has got ntpd functioning correctly.

Here's today's 2nd blocker:

===> cddl/lib/drti (install)
/usr/bin/cc  -O2 -pipe
- -I/usr/src/cddl/lib/drti/../../../sys/cddl/compat/opensolaris
- -I/usr/src/cddl/lib/drti/../../../cddl/compat/opensolaris/include
- -I/usr/src/cddl/lib/drti/../../../cddl/contrib/opensolaris/head
-
-I/usr/src/cddl/lib/drti/../../../cddl/contrib/opensolaris/lib/libctf/common
 -I/usr/src/cddl/lib/drti/../../../cddl/contrib/opensolaris/lib/libdtrace/common  -I/usr/src/cddl/lib/drti/../../../sys/cddl/contrib/opensolaris/uts/common  -DPIC -fpic -DNEED_SOLARIS_BOOLEAN -std=gnu99 -fstack-protector -Wsystem-headers -Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wunused-parameter -Wcast-align -Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls -Wold-style-definition -Wno-pointer-sign -Wno-unknown-pragmas -Wmissing-variable-declarations -Wthread-safety -Wno-empty-body -Wno-string-plus-int -Wno-unused-const-variable -Qunused-arguments -c /usr/src/cddl/lib/drti/../../../cddl/contrib/opensolaris/lib/libdtrace/common/drti.c -o drti.o
error: unable to open output file 'drti.o': ''

Best regards,
Russell
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