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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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vxumount(1M)															      vxumount(1M)

NAME
vxumount - unmount a VxFS file system SYNOPSIS
{special|mount_point} DESCRIPTION
unmounts a currently mounted VxFS file system, which you can specify either as a mount_point or as special, the device on which the file system resides. Note: Only a privileged user can unmount file systems. Options recognizes the following option: Specifies the VxFS-specific options in a comma-separated list. The available argument is: Unmounts a VxFS file system even if it contains a busy file. If is not specified, does not unmount the file system if it contains a busy file. Programs that try to access files after a file system is forcibly unmounted receive an EIO error. Caution: Using the option can cause data loss for open files. Operands recognizes the following operands: mount_point Name of the mount point for a VxFS file system. special The device on which the file system resides. FILES
table of mounted file systems SEE ALSO
fsadm_vxfs(1M), mkfs_vxfs(1M), mount(1M), mount_vxfs(1M), setmnt(1M), fsync(2), setuid(2), fs_vxfs(4), mnttab(4), vxfsio(7). vxumount(1M)
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