I recently had a bad UPS lead to a sudden crash of several machines. One of them (running FreeBSD) didn't come back up until I replaced the power supply, but it's still not fully back. Both the BIOS and the OS complain about a disk being missing; swapping around power cables and data cables and such has convinced me that the problem is the disk itself. FreeBSD won't fully start up due to a problem mounting something from /etc/fstab:
Mounting local file systems: mount: /fdesc: No such file or directory
If I comment out the fdesc line in fstab, everything seems to come up OK. But... that can't be good, can it? I don't know anything about fdesc besides what I've read in the past few minutes, but it seems like a low-level thing dealing with stuff like stdin and stdout, which seem important to me.
There does exist /dev/fd, which does contain /dev/fd/0, /dev/fd/1, and /dev/fd/2, and brief piping experiments at the command line seem to indicate that stdin, stdout, and stderr are all working OK.
What might be the cause of it being unable to mount /fdesc? And what horrible things will happen if I just continue to run without mounting it? How might I be able to get /fdesc back?
The contents of /etc/fstab, after I commented out the fdesc line:
#Device Mountpoint FSType Options Dump Pass# /dev/ada0p2 / ufs rw 1 1 /dev/ada0p3 none swap sw 0 0 #/dev/fd fdesc fdesc rw 0 0
Plus a couple Samba mounts which seem to be working fine.