03-14-2008
... at least he wrote a working script and described in detail what the issue was, unlike many posters who allegedly are professionals and ask for very complex stuff but make no effort to write anyting...
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NBDST(8) BSD System Manager's Manual NBDST(8)
NAME
nbdst -- NetBoot deferred shadow tool
SYNOPSIS
nbdst [-recycle | -preallocate size] devnode shadowfile
DESCRIPTION
nbdst is used during NetBoot to associate a shadow file with the disk image being used as the root device. After the shadow file is attached,
subsequent writes to the root device will be redirected to the shadow file, which normally resides on local storage. nbdst is invoked by
/etc/rc.netboot
ARGUMENTS
The following arguments must be specified:
devnode The device node of the root device, in the form "disk0"
shadowfile Path to a shadow file which will be created and associated with the NetBoot root device
OPTIONS
-recycle If a shadow file already exists, reset it and use it again. Otherwise, information written to an existing shadow file will reap-
pear. Reusing a previous shadow file without resetting it requires that the shadow file be created with the same base image.
-preallocate size
Set the shadow file to the given size up front. This forces a reset of the shadow file (like -recycle).
NOTE
nbdst can only be run as root.
SEE ALSO
hdiutil(1), hdik(8)
macOS 29 Apr 2003 macOS