Slimming down Jails

[dpearcefl]

FreeNAS 9.10

When I create a new jail, it winds up taking 1.7GB of disk space according to 'du'. Is this normal? Can I nuke some of the files safely?

I know du isn't real accurate on ZFS except when using the -A flag.

[root@nas-test1 /mnt/Mirror/jails/Test1/usr]# du -h -d 1 -A
289M ./ports
18M ./include
6.0K ./pbi
93M ./lib
849M ./src
80M ./bin
512B ./obj
13M ./sbin
261K ./games
69M ./share
205K ./libdata
2.7M ./libexec
72M ./lib32
234M ./local
1.7G .

Why does the FreeNAS GUI show this jail uses 50.4 MB with 1.12% compression, no dedup.

 

[Joshua Parker Ruehlig]

I'm not 100% sure, but I bet jails are zfs clones or somehow use zfs not actually take any extra space (except for changes).
ezjail does that though freenas uses warden