NOR_NAS

Looks like a file system check did the trick. Thank you Squid. You saved me from restoring files for the next days.

Thank you for getting back to me Squid. I´m on the road for a couple of days, but will try running the file system check as soon as I return home and report the result.

Thanks for getting back to me so quickly. The formatting suggestion might look like the obvious answer, but I doubt that this is the (only) problem. The original Disk 5 still contains all the files. I am able to access them from a different computer. The first time I rebuilt the array was with a new disk directly from the shop. The disk was neither precleard nor formatted. The second time I rebuilt was with a precleared disk. I formatted the disk with xfs as an unassigned device before I assigned it to the array. If the disk was formatted the available capacity should be reported as 4 TB with 4 TB free. Now Unraid tells me that the 4 TB disk is 2 TB and 1.75 TB is used. When viewing the content of the disk from the Unraid GUI (folder icon on the right-hand side) there are no files. I turned the server off after the rebuild to minimize disk usage, so the diagnostic data attached is from a freshly booted server. I would appreciate if anyone could take a look at them to see if there are any other clues to what have happened.

The server is configured with one 4TB parity disk and two 4TB and three 2 TB data disks for a total of 14 TB data storage. I also have a 500 GB SSD Cache. The server runs several dockers and VMs. I found the server running with one of the 2TB data disks (disk 5) disabled and decided to exchange this for a 4TB. I followed the description I found on https://wiki.unraid.net/Replacing_a_Data_Drive for replacing the disk. The procedure ran without any apparent error messages and I received two positive event notification on mail: #1 Event: Unraid Disk 5 message Subject: Notice [NASFERATU] - Disk 5 returned to normal operation Description: WDC_WD40EFRX-68WT0N0_WD-WCC4E1SVL51X (sdj) Importance: normal #2 Event: Unraid Parity sync / Data rebuild Subject: Notice [NASFERATU] - Parity sync / Data rebuild finished (0 errors) Description: Duration: 12 hours, 20 minutes, 5 seconds. Average speed: 90.1 MB/s Importance: normal On closer inspection I noticed that the array capacity was still at 14TB. In the main window in Unraid the disk details for disk 5 showed: · Green light for the disk on the far left · The correct serial number and capacity of the new disk on the left side · The capacity and utilisation numbers from the old disk on the right-hand side When accessing the disk directly using the folder icon on the right-hand side, Unraid tells me the disk has no files or folders. I tried to rebuild the array twice. First with an unformatted disk that was not precleared (couldn’t remember where I stored the precleared one at first ) and later with a disk that was precleared and formatted with XFS. Both tries gave the same result. I keep off-site backups of all my data so one solution would be to set up the array from scratch. This is however a lengthy process and, since rebuilding an array is a vital function in Unraid, I would like to be able to run this procedure successfully. I would appreciate any advice on how to move forward with rebuilding the array