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Full Discussion: LVM Memory Usage
Operating Systems Linux Red Hat LVM Memory Usage Post 302758713 by sixstrings on Sunday 20th of January 2013 02:10:15 PM
Old 01-20-2013
Also, the file systems leave a small bit of space "unavailable" on purpose. This allows for the root user to access and perform functions in a file system that shows 100% full and not have a full disk make the system totally unusable. You don't want to remove that.
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rmfdmn(8)						      System Manager's Manual							 rmfdmn(8)

NAME
rmfdmn - removes a file domain SYNOPSIS
/sbin/rmfdmn [-f] domain OPTIONS
Turns off the message prompt. OPERANDS
Specifies the name of an existing file domain. DESCRIPTION
Use the rmfdmn utility to remove an existing, but unused, file domain and all its filesets from the system. When you remove a file domain: The file domain and its filesets are destroyed The directory entry for the file domain in the /etc/fdmns file is deleted AdvFS volumes which were assigned to the file domain are relabeled as unused Before attempting to remove a file domain, unmount all filesets and clone filesets from the domain using the umount command. If you attempt to remove a file domain that has mounted filesets or clone filesets, the system does not remove the file domain. Instead, it dis- plays an error message indicating that a fileset is mounted. For each file domain you attempt to remove, a prompt similar to the following is displayed: rmfdmn accounts_dmn rmfdmn: remove domain accounts_dmn? [yes/no] If you answer n, the file domain remains. If you answer y, it is removed. The default is n, the file domain remains. The -f option is useful for scripts when you do not want to be queried for each file domain. If you choose the -f option, no message prompt is displayed. The rmfdmn command operates as if you responded yes to the prompt. RESTRICTIONS
You must be the root user to use this command. To remove a domain, all filesets and clone filesets must be unmounted. The rmfdmn command can leave a partially-removed domain in the /etc/fdmns directory, for example, should there be a system failure during the remove operation. If this happens, the remnants of the removed domain are put in the /etc/fdmns directory as a file with a name in this format: rmfdmn.domain_name.processid. If you interrupt the rmfdmn command or there is a system failure during its operation, check the /etc/fdmns directory for domain names in this format and use the rmfdmn command to delete them. However, if a partially-removed domain has been in the /etc/fdmns directory for some time, it can be risky to remove it with the rmfdmn command: the partitions might have been put back into use and deleting them would make them unusable. [The rmfdmn command puts an unused option in the fstype field of the disk label when it removes disks.] In this case, use the rm -r command to remove the partially-recovered domain. Unlike the rmfdmn command, the rm command does not alter the fstype field of the disk label. EXAMPLES
The following example removes the accounts_dmn file domain. In this example, the accounts_dmn#credit_fs fileset is mounted on the /mnt3 directory and must be unmounted. When the verification prompt for removing the accounts_dmn is displayed, yes is selected. # umount /mnt3 # rmfdmn accounts_dmn # rmfdmn: remove domain accounts_dmn? [yes/no] # rmfdmn: domain accounts_dmn removed FILES
Contains file domain names and devices. SEE ALSO
mkfdmn(8), advfs(4), showfdmn(8), mount(8) rmfdmn(8)
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