The problem with dump that you only can dump a complete filesystem. And it needs space for the filesystem snapshot if you use that "-L" flag,
As a side remark, the OpenBSD dump is different, that can do a level 0 dump of parts of a filesystem, but that doesn't help you here.
From a recently installed FBSD 7.2 system with a ports collection, apache22 and mailman install:
Code:
df -h
Filesystem Size Used Avail Capacity Mounted on
/dev/ad0s2a 496M 145M 311M 32% /
devfs 1.0K 1.0K 0B 100% /dev
/dev/ad0s2e 496M 12K 456M 0% /tmp
/dev/ad0s2f 33G 1.6G 28G 5% /usr
/dev/ad0s2d 1.4G 148M 1.2G 11% /var
Here I still have plenty of free space in '/usr' for a filesytem snapshot
An overview of the '/usr' directories:
Code:
# ls -l /usr
total 52
drwxrwxr-x 2 root operator 512 Dec 20 20:09 .snap
drwxr-xr-x 2 root wheel 7168 Dec 21 01:30 bin
drwxr-xr-x 2 root wheel 512 Dec 20 20:12 compat
drwxr-xr-x 2 root wheel 512 Dec 20 20:12 games
drwxr-xr-x 47 root wheel 4608 May 1 2009 include
drwxr-xr-x 6 root wheel 11264 Dec 20 20:28 lib
drwxr-xr-x 5 root wheel 512 May 1 2009 libdata
drwxr-xr-x 5 root wheel 1536 Dec 20 20:28 libexec
drwxr-xr-x 15 root wheel 512 Dec 21 01:56 local
drwxr-xr-x 2 root wheel 512 Dec 20 20:12 obj
drwxr-xr-x 69 root wheel 1536 Dec 21 01:55 ports
drwxr-xr-x 2 root wheel 5120 Dec 20 20:28 sbin
drwxr-xr-x 26 root wheel 512 Dec 20 20:11 share
drwxr-xr-x 22 root wheel 512 Dec 20 20:12 src
A look at the usage for each directory
Code:
# for X in $(ls -d /usr/*) ; do du -sk $X ; done
27910 /usr/bin
2 /usr/compat
2 /usr/games
17700 /usr/include
38954 /usr/lib
92 /usr/libdata
18302 /usr/libexec
194532 /usr/local
2 /usr/obj
564984 /usr/ports
15754 /usr/sbin
339336 /usr/share
506084 /usr/src
An alternative more human friendly version
Code:
# for X in $(ls -d /usr/*) ; do du -sh $X ; done
27M /usr/bin
2.0K /usr/compat
2.0K /usr/games
17M /usr/include
38M /usr/lib
92K /usr/libdata
18M /usr/libexec
190M /usr/local
2.0K /usr/obj
552M /usr/ports
15M /usr/sbin
331M /usr/share
494M /usr/src
So the disk space usage hogs are here
- "/usr/local" with 190 mb
- "/usr/ports" with 552 mb
- "/usr/share" with 331 mb
- "/usr/src" with 494 mb
If I would be short of space I would have to analyze where the volatile data
is stored. That would be "/usr/local/mailman/archives"
So I could add in another disk and move some of the "/usr" disk directories, like those mailman archives, to the second disk to make more space for filesystem snapshots.
Or rethink the partition scheme and create separate filesystems for some of the '/usr' subdirectories.
How much space do you have left on your system (df -h)?