*BSD News Article 89946


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From: Tony Griffiths <tonyg@OntheNet.com.au>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Mount point going "west" [filesys becomes invisible]
Date: Sun, 23 Feb 1997 11:59:57 +1000
Organization: On the Net (ISP on the Gold Coast, Australia)
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Has anyone seen the following error on FreeBSD 2.1.5-RELEASE (or any
release for that matter) -

The 'mount' and 'df' commands show that some filesystems are mounted and
so much space is being used.  However, an 'ls' of the mount point shows
an empty directory!

This has happened to be at least once before on a DEC Unix workstation
and the only recourse (as with the FreeBSD box) was a reboot.  However,
I am curious as to how the filesystem becomes "detached" from it's mount
point but is still visible via mount/df !!!

This happened to two filesystems on our Web proxy server (128MB P120),
but it was only the 4GB SCSI disks that went "west".  The root and /usr
filesystems located on a 3GB IDE disk stayed home.

Has this sort of problem happened to anyone else running FreeBSD as a
server?  We also use FreeBSD on our news server also with 2 4GB SCSI
disks (same NCR810 controller) and I can't recall this problem happening
there even though it does one hell of a lot more I/O that the proxy!

Tony