FreeBSD 8.0 included production support for ZFS, and even though Netbackup 7 has support for up to FreeBSD 8.1, the client itself is still a FreeBSD 6.0 binary and doesn't know anything about ZFS. The list of filesystems included by the ALL_LOCAL_DRIVES selection is hardcoded and can't be changed, but it is possible to fool bpbkar into thinking that zfs filesystems are ufs and backing them up.
Attached is the source to the solution I came up with. bpbkar and friends use the getfsstat() libc function to get a list of mounted filesystems, and will ignore unknown filesystem types based on the info that is returned. Using the LD_PRELOAD linker option, it's possible to intercept calls to getfsstat() and substitute "ufs" for "zfs". Netbackup will then back the filesystems up as if they were UFS. Since it just uses a modified tar to back up Unix systems, Netbackup doesn't really care what the underlying filesystem type is as long as it can walk the directory tree and read all the files.
To use, save the attached file, rename it to "fakegetfsstat.c" because the forum interface won't let me attach files ending in .c, and execute it by running "sh fakegetfsstat.c". If your FreeBSD system is 64-bit, you will need find a 32-bit system to compile it on, since the Netbackup client is 32-bit. It will build a shared object called "fakegetfsstat.so". Copy that file into /usr/local/lib/ , edit /usr/local/etc/rc.d/S77netbackup.sh , and add one of the following lines at the top:
(if you are on a 64-bit system)
export LD_32_PRELOAD=/usr/local/lib/fakegetfsstat.so
(if you are on a 32-bit system)
export LD_PRELOAD=/usr/local/lib/fakegetfsstat.so
That will insert the wrapper shared object into every Netbackup process. Then run a backup and verify that your ZFS filesystems are getting backed up.
