unionfs
Tim Judd
tajudd at gmail.com
Fri Jul 17 02:29:52 UTC 2009
I've got an odd problem, and I'm puzzled why it's so puzzling.
At home, my router serves as a basic single-client diskless server.
Been working beautifully with no issues. Filesystems mount as
expected and operations are as quick as expected as the server who's
servicing it.
The diskless fstab tells to mount the following:
server:/diskless / nfs ro 0 0
md /var.mfs mfs rw,-M,-s=256m 0 0
/var.mfs /var unionfs rw 0 0
Everything works beautifully, no errors. Kernel is 7.2R-p2
I copied this exact fstab, to a new hardware firewall and it fails to
accomplish the same task.
/dev/ad0s1a / ufs ro 0 0
md /var.mfs mfs rw,-M,-s=64m 0 0
/var.mfs /var unionfs rw 0 0
Kernel is standard 7.2R kernel, no changes
Two changes only:
root is on a hard disk as UFS instead of NFS
memory filesystem (which mounts) is only 64M
However, when 7.2-RELEASE (unpatched so far) boots, it fails to mount
the unionfs /var.mfs (upper) on top of /var (lower).
The error returned is "mount_unionfs: /var: operation not supported by device"
Any clues? anything you need? I'd appreciate any straws to reach for.
--Tim
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