Date: Fri, 11 Jan 2013 16:32:19 +0100 From: "Ronald Klop" <ronald-freebsd8@klop.yi.org> To: freebsd-stable@freebsd.org Subject: Re: Deleting the top-level ZFS file system (without affecting its children) Message-ID: <op.wqq6r5vi8527sy@ronaldradial.home> In-Reply-To: <BABF8C57A778F04791343E5601659908236D44@cinip100ntsbs.irtnog.net>
index | next in thread | previous in thread | raw e-mail
On Fri, 11 Jan 2013 16:11:32 +0100, xenophon\+freebsd <xenophon+freebsd@irtnog.org> wrote: > When I originally set up ZFS on my server, I used the topmost file > system for the root file system. Last night, I used "zfs send" and "zfs > recv" to create a new root file system named "zroot/root". Then, I > adjusted the mount points in single-user mode. Based on my reading of > the contents of src/sys/boot/zfs/ and src/sys/boot/i386/zfsboot/ > (specifically the zfs_mount() and zfs_get_root() functions in > zfsimpl.c), I ran "zpool set bootfs=zroot/root zroot". This should > allow the boot program to find the new root file system. > > Now, I'd like to delete the old root file system and return its storage > to the pool. Clearly, "rm -rf /oldroot/*" wouldn't return the space > already allocated to the old root file system, but I don't want to run > "zfs destroy zroot", as that will probably affect its children (the > whole rest of the pool). At this point, I suspect that I'd have to > re-create the pool to get the desired configuration. > > Is my understanding correct? > > Right now, the pool's datasets look something like the following: > > xenophon@cinep001bsdgw:~>zfs list > NAME USED AVAIL REFER MOUNTPOINT > zroot 75.5G 143G 1.04G /oldroot > zroot/root 1.04G 143G 1.03G / > zroot/usr 28.6G 143G 10.2G /usr > (etc.) > > Best wishes, > Matthew > Why would rm -rf /oldroot/* not return all the allocated space? I can only think of snapshots keeping the space allocated, but you can remove those too. Can you elaborate on that? Ronald.help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?op.wqq6r5vi8527sy>