Eekiig

UPDATE: No more freezes since upgrade to the HWE-Kernel.

System is now uptime since 51 days without freeze or reboot.

Well done, Ubuntu-Community!

UPDATE: System is still stable - Added new hardware:

 + Another WD Blue WD20EZAZ (Still RAID5 )

+ inLine SATA Controller (2 new Slots to have all the four MB-SATA-Slots for the Hotswap Bays)

+ Replaced the single Samsung Evo 850 against 2x SAMSUNG 470 SSD (RAID 1)

Well online-merge to the new SSD's and the expand of the raid was without trouble... I love linux....

System is (as before) rock solid....

Thanks for time to read this info....

UPDATE:

If you're running WD-HDD's (WD Blue 2TB+ / Some WD-Red) under Linux,

you may be affected to the "LCC-BUG".

You can recognize this by watching your SMART-Values.

If your "Load cycle count" is very high, you should avoid that your drive is going to sleep

as it may decrease your lifetime if the drive always park the heads of your HDD.

Currently there seems not be a solution, if you cant set the power-mode via hddparm. (my case)

A Little dirty workaround is to use this provided script witch will tickle the HDD every 7 seconds to

avoid parking the heads. I've testet it for months and it seems to work fine.

while : ; 
    do sleep 7;
    smartctl -A /dev/sda | grep "Load_Cycle_Count\|FLAG\|smartctl" ;
    smartctl -A /dev/sdb | grep "Load_Cycle_Count\|FLAG\|smartctl" ;
done

Replace or add any affected device. (In this example sda and sdb are affected.)

You can safe this code as .sh-file and make it executable.

I did not recognize any performance-degration and my load-cycle-count does not improve anymore.

Thanks for reading, I'm very open for response.