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Conference turris::digital_unix

Title:DIGITAL UNIX(FORMERLY KNOWN AS DEC OSF/1)
Notice:Welcome to the Digital UNIX Conference
Moderator:SMURF::DENHAM
Created:Thu Mar 16 1995
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:10068
Total number of notes:35879

9061.0. "cdfs_mount: Unknown descriptor type" by DECWET::JO (Mary had a little lamb, with mint jelly. Dot Warner) Thu Mar 06 1997 17:53

    
    i can't mount a cd from a system with UNIX v4.0 (rev 375).  i get the
    following error 
    
    # mount -r /mnt
    cdfs_mount: Unknown descriptor type
    /dev/rz1c on /mnt: No valid filesystem exists on this partition
    
    the kernel was built with the cdfs option.  the cd i'm trying to read
    is Digital Unix v4.0 Operating Systems Volume 1 CD dated May 1996.
    
    i'm trying to install the multimedia subsets.
    
    any help would be appreciated.
    
    thanks.
    jo
T.RTitleUserPersonal
Name		DateLines
9061.1i bet it's defined in /etc/fstabRHETT::MOOREThu Mar 06 1997 20:448
    You must have /mnt defined in /etc/fstab to mount a CDFS (ISO 9660) CD
    from /dev/rz1c.  To override this, try:
    
    mount -r -t ufs /dev/rz1c /mnt
    
    Martin Moore
    Digital UNIX Support
    Atlanta CSC
9061.2that worked!!!DECWET::JOMary had a little lamb, with mint jelly. Dot WarnerFri Mar 07 1997 14:067
    
    i do have it in my /etc/fstab.  i guess cdfs is not used for cd's
    anymore?
    
    i tried your example and it worked.  thanks!
    
    jo
9061.3here's whyRHETT::MOOREFri Mar 07 1997 16:1216
    The problem is that CD's can be either UFS or CDFS.  Most Digital
    CD's, at least the installation CD's, are UFS.  Some Digital CD's
    and virtually all third-party CD's are CDFS.
    
    By having the device defined in /etc/fstab the way you did, it caused
    mount to pick up the CDFS definition when you issued the mount command
    you did.  It therefore used CDFS as a default, when normally UFS is the
    default for the mount command.  If you had been mounting a CDFS CD, it
    would have worked just fine; but the installation CD is UFS, so it
    complained.  By adding the "-t ufs" option, you overrode the CDFS
    definition in /etc/fstab and forced mount to use a filesystem type of
    UFS.
    
    I hope that clears it up.
    
    Martin
9061.4thanks again!DECWET::JOMary had a little lamb, with mint jelly. Dot WarnerFri Mar 07 1997 16:515
    
    thanks Martin for the explanation.  i'll remove the entry
    in my fstab.
    
    jo