10-18-2010
You have some other options:
What is your file system layout like?
Is the VM mapped to a physical block device or a file acting as one?
One thing to consider is that you can boot a recovery disk or something like a rescue CD image after presenting another disk or disk image and move /var /usr and /tmp to there. Those file systems tend to do well on their own partitions.
The way to go about this would be to present additional disk devices and then, from the system, modify the /etc/fstab file to point to the new devices. But, before you allow them to be mounted, I would suggest you rsync each directory to its new location. Once you have mounted the new location over the directory, the contents of those original directories will be inaccessible.
Last edited by mark54g; 10-18-2010 at 11:15 PM..
Reason: adding clarity
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FSTAB(5) File Formats Manual FSTAB(5)
NAME
fstab, mtab - list of file systems to mount, mounted file system table.
SYNOPSIS
/etc/fstab
/etc/mtab
DESCRIPTION
/etc/fstab is a table of file system to mount at boot time, /etc/mtab is a table of currently mounted file systems as maintained by mount
and umount.
/etc/fstab is not read by mount as it should be. It is instead a simple shell script listing the three devices that Minix needs to oper-
ate: The device names of the root file system, the temporary (scratch) file system, and the file system for /usr. Of these only the /usr
file system is mounted in /etc/rc, the scratch file system is there for the system administrator to test new kernels, or as a temporary
file system.
/etc/mtab contains lines of four fields. The layout is:
device directory type options
These fields may be explained as follows:
device
A block special device.
directory
Mount point.
type
Either 1, or 2, indicating a V1 or V2 file system.
options
Either ro, or rw, indicating a read-only or read-write mounted file system.
FILES
/etc/fstab Shell script naming three important file systems.
/etc/mtab List of mounted file systems.
SEE ALSO
printroot(8), mount(1), fsck(1), mkfs(1).
BUGS
/etc/fstab is a joke.
AUTHOR
Kees J. Bot (kjb@cs.vu.nl)
FSTAB(5)