SimeonG

No, I got it figured out, dmesg was spitting Buffer I/O error on dev sdd, had no gui so couldnt get info on what drive it was and didnt want to restart. killing the dd process got back the ui and all drive where present. Im guessing a problem whith preclear but will start a thread on it if i cant figure it out. just wanted to post the "lsof +L1" as it found my problem. This thread helped me get started troubleshooting and seamed related to this phantom file system full. this was the first thing that came up searching for unraid Warning: session_write_close(): write failed: No space left on device). on google. The ram drive triped me up a bit as what looking around the stick and had plenty of space, I even tried deleting some logs to clear space but it would just instantly fill agen even thogh du showed low space useage by files. Some post even claimed that mounting over a non empty directory would cause this but couldn't find anything like that. Didint notice it was an old thread sorry about that

I just had this happen while rebuilding parity. I decided to preclear a disk as well and shortly after the ui gave (unraid Warning: session_write_close(): write failed: No space left on device). "du -shx /* | sort -rh" showed enogh free space on the 16gb memory stick, but df -h showed rootfs full. I was stumped. the array was still building but the preclear disk was not showing led activity. Found some posts about rootfs full but not and found that if a file is deleted but in use du dosnt count it. "lsof +L1" shows such files. in my case it was COMMAND PID USER FD TYPE DEVICE SIZE/OFF NLINK NODE NAME dd 29330 root 0r BLK 8,48 0x2baa1280000 0 639212 /dev/sdd (deleted) dd 29330 root 2w REG 0,2 16114245632 0 663754 /tmp/.preclear/sdd/dd_output (deleted) after killing dd using kill -9 29330 everything retured to normal but the preclear. hope this is related?