I had actually erased and formatted the system by the time you wrote this message, so I have waited until an issue occurred .... which was tonight.
Unfortunately I had to hit the reset button on my PC a few days ago because of an issue with the nvidia driver - somehow it locked up my keyboard and mouse.
Even though I have the sdfs filesystem in my /etc/fstab for some weird reason it never mounts it on boot. I'd forgotten about my 4 AM backups of my mail spool file (it's 18 GB .... don't judge)! I needed to mount the /media/opendedup mount point, which failed with the usual java errors that I've come to recognise so frequently.
I followed through with my usual solution:
rm -rf /media/500GB-BKUP/sdfs-volumes/chunkstore/chunks/ ; mount /media/opendedup
The filesystem mounted, and the backup ran. I then (being awake at 04h30) thought "Let me check if the files are still working". I've had seven mail folder backups so far on the newly formatted system. And again ....
[root@fedora chunks]# head /media/opendedup/mailbkup/mail-2020-08-04/louis
head: error reading '/media/opendedup/mailbkup/mail-2020-08-04/louis': No data available
What's worse is that a) the backup ran successfully, and b) the other jobs are all also corrupt - the below one worked when it was backed up:
[root@fedora mailbkup]# head mail-2020-07-20/louis
head: error reading 'mail-2020-07-20/louis': No data available
I've tried your suggestions of deleting the BucketInfo file and remounting, and then of changing closed-gracefully to false and remounting. Neither helped.
For info sake, the output to your three checks for my folder is:
[root@fedora ~]# export port=6442
[root@fedora ~]# sdfscli --port $port --debug-info
Active SDFS Threads : 54
CPU Load : 183%
SDFS CPU Load : 1%
Total Memory : 8.98 GB
Free Memory : 8.49 GB
Free Disk Space for Chunk Store: 151.53 GB
Total Space for Chunk Store: 457.45 GB
[root@fedora ~]# sdfscli --port $port --volume-info
Files : 6657
Volume Capacity : 1.46 TB
Volume Current Logical Size : 106.45 GB
Volume Max Percentage Full : 95.0%
Volume Duplicate Data Written : 345.71 GB
Unique Blocks Stored: 0 B
Unique Blocks Stored after Compression : 0 B
Cluster Block Copies : 2
Volume Virtual Dedup Rate (Unique Blocks Stored/Current Size) : 0%
Volume Actual Storage Savings (Compressed Unique Blocks Stored/Current Size): 0%
Compression Rate: 0%
[root@fedora ~]# sdfscli --port $port --dse-info
DSE Max Size : 1.46 TB
DSE Current Size : 0 B
DSE Compressed Size : 0 B
DSE Percent Full : 0.0%
DSE Page Size : 41943040
DSE Blocks Available for Reuse : 0
Total DSE Blocks : 5144090
Average DSE Block Size : 0
DSE Current Cache Size : 73.15 MB
DSE Max Cache Size : 10 GB
Trottled Read Speed : 0 B/s
Trottled Write Speed : 0 B/s
Encryption Key : DmVSVm2wNY7DJnHPf1CYMHGVDtx5KRpNtLgbceVxFqjy=2JFhD2xgzQ9KPWaZHkl
Encryption IV : e4f8d885ba637b103c61f9a3d94f7cac
Incidentally, the folder structures are all there - but I get that read error on any file I try to read.
So, like I originally stated, it seems OpenDeDup is very unreliable with my data!