Really appreciate the hard work on this plugin. I ran into an issue on two drives I was clearing. They both got hung up at "Zeroing 99%", been sitting there for a few hours now. I had 2 additional drives complete without issue all started around at the same time.
The last log entries I see from those two drives is below. Running Unraid 6.8.1 and Preclear Plugin 2020.01.17b
Jan 22 13:00:34 preclear_disk_R6G9R8HY_32737: Zeroing: dd output: 8000423067648 bytes (8.0 TB, 7.3 TiB) copied, 48210.5 s, 166 MB/s
Jan 22 13:00:34 preclear_disk_R6G9R8HY_32737: dd process hung at 8000425164800, killing....
Jan 22 13:00:34 preclear_disk_R6G9R8HY_32737: Continuing disk write on byte 8000423067648
Jan 22 13:00:34 preclear_disk_R6G9R8HY_32737: Zeroing: dd if=/dev/zero of=/dev/sdd bs=2097152 seek=8000423067648 count=1140154368 conv=notrunc iflag=count_bytes,nocache,fullblock oflag=seek_bytes
Jan 22 13:00:34 preclear_disk_R6G9R8HY_32737: Zeroing: dd pid [1759]
Jan 22 13:01:43 preclear_disk_R6G9R8HY_32737: Zeroing: dd - wrote 8001563222016 of 8001563222016.
Jan 22 12:52:20 preclear_disk_VLK6324Y_14584: Zeroing: dd output: 3815324+0 records out
Jan 22 12:52:20 preclear_disk_VLK6324Y_14584: Zeroing: dd output: 8001314357248 bytes (8.0 TB, 7.3 TiB) copied, 47930.3 s, 167 MB/s
Jan 22 12:52:20 preclear_disk_VLK6324Y_14584: dd process hung at 8001316454400, killing....
Jan 22 12:52:20 preclear_disk_VLK6324Y_14584: Continuing disk write on byte 8001314357248
Jan 22 12:52:20 preclear_disk_VLK6324Y_14584: Zeroing: dd if=/dev/zero of=/dev/sdf bs=2097152 seek=8001314357248 count=248864768 conv=notrunc iflag=count_bytes,nocache,fullblock oflag=seek_bytes
Jan 22 12:52:20 preclear_disk_VLK6324Y_14584: Zeroing: dd pid [14515]
Jan 22 12:52:22 preclear_disk_VLK6324Y_14584: Zeroing: dd - wrote 8001563222016 of 8001563222016.