NAS 104 locking up

Another BIG problem is this (sorry) stupid minidlnad that seems not to be designed for single-core-cpus. Disabling ReadyDLNA (=minidlnad) gives you a HUGE performance-boost.

You can use this little commandset to check the "death/sleeping" processes that are causing the IO-problems on this box:

# for HH in $(seq 1 1 10); do ps -eo state,pid,cmd | grep "^D"; echo "---========================================---"; sleep 5; done

For example:

root@readynas1:/tmp# for HH in $(seq 1 1 10); do ps -eo state,pid,cmd | grep "^D"; echo "---========================================---"; sleep 5; done D 7672 chattr -c /data/sabnzbd ---========================================--- D 1355 [btrfs-transacti] D 7684 /usr/sbin/minidlnad -S ---========================================--- D 7689 rm -rf /apps/.readydlna/files.db /apps/.readydlna/art_cache ---========================================--- D 1922 [flush-btrfs-1] D 7695 /usr/sbin/minidlnad -S ---========================================--- D 772 [jbd2/md0-8] D 1922 [flush-btrfs-1] D 7695 /usr/sbin/minidlnad -S ---========================================--- D 1922 [flush-btrfs-1] D 7695 /usr/sbin/minidlnad -S ---========================================--- D 1922 [flush-btrfs-1] D 7695 /usr/sbin/minidlnad -S ---========================================--- D 7695 /usr/sbin/minidlnad -S ---========================================--- D 1355 [btrfs-transacti] D 7695 /usr/sbin/minidlnad -S ---========================================---

To make miniDLNA sweat copy some JPEGS or movies onto a DLNA-enabled share while minidlna is running and watch the IO-wait grow into heaven.
You also can disable DLNA while copying MANY files onto the box, what in my opinion makes no sense, but maybe helps.

Kind regards,
Roy