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Top Forums UNIX for Advanced & Expert Users /etc/mnttab is zero length - I have done a silly thing Post 302149104 by Smiling Dragon on Tuesday 4th of December 2007 10:42:02 PM
Old 12-04-2007
Error /etc/mnttab is zero length - I have done a silly thing

Being the clever-clogs that I am, I have managed to clobber the contents of /etc/mnttab.

It started when I tried to unmount all the volumes in a prticular veritas disk group and neglected to include a suitable grep in my command line, thus attempting to unmount _all_ the filesystems on the server (for loop).

They all came back with a fs busy message so I was presuming no harm done. However, a df to check all was in order came back with no results, likewise running mount.

When I went to look in the mnttab itself I find it's zero length !?! Smilie

Everything appears ok in that the filesystems are still actually mounted and read/write.

If I try a mount or umount I get the message
"mount: Inappropriate ioctl for device"

I suspect a reboot would sort me out but that's a big hammer and I'd rather get to the bottom of it.

What have I done and how in the world do I fix it?

Running solaris 10 on a T2000, fairly recent patches applied. Bugger all running aside from base OS and SAN kit.
 

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MOUNT(2)							System Calls Manual							  MOUNT(2)

NAME
mount, umount - mount or umount a file system SYNOPSIS
#include <unistd.h> #include <sys/mount.h> int mount(char *special, char *name, int flag) int umount(char *name) DESCRIPTION
Mount() tells the system that the file system special is to be mounted on the file name, effectively overlaying name with the file tree on special. Name may of any type, except that if the root of special is a directory, then name must also be a directory. Special must be a block special file, except for loopback mounts. For loopback mounts a normal file or directory is used for special, which must be seen as the root of a virtual device. Flag is 0 for a read-write mount, 1 for read-only. Umount() removes the connection between a device and a mount point, name may refer to either of them. If more than one device is mounted on the same mount point then unmounting at the mount point removes the last mounted device, unmounting a device removes precisely that device. The unmount will only succeed if none of the files on the device are in use. Both calls may only be executed by the super-user. SEE ALSO
mount(1), umount(1). AUTHOR
Kees J. Bot (kjb@cs.vu.nl) MOUNT(2)
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