I am only just starting with aufs, and my context is using it to overlay
eight disks to form a kind-of RAID.
I find three symptoms:
1. If I do a 'find' command on the aufs-mounted directory (e.g. 'find
/mnt/merge/data -print') it starts fine. If I do Ctrl-C to terminate,
it doesn't. I cannot kill the find command even with kill -9 as root
2. If I have used the mounted directory, then the server will not shut
down completely. The console has warnings like 'INFO: task
umount.aufs:3746 blocked for more than 120 seconds.'
3. If I do a df -h then the reported free space and available space is
for the first branch added, and not for the overall disk.
My system is a near-pristine Debian stretch, AMD64. The disks are 1.0TB
SATA, and seem to be OK (no errors other than non-serious ones in
smartctl), though they are ageing.
Kernel is 4.9.0-6-amd64, as per Debian repos. aufs-tools is
1:4.1+20161219-1, which I understand to be based on aufs v4.1, c.
2016-12-19.
Things I've tried:
* unmounting before shutting down: this then shuts down cleanly (but
doesn't solve the 'find' problem
* mounting only a single branch: this still causes 'find' to be
unkillable and shutdowns to be incomplete
Can anyone offer suggestions of what to try next?
Tony
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