July 1, 201412 yr I've just added a 8th disk to my array and a AOC-SAS2LP-MV8 to my server. Removed parity, copied data from disk to disk, created parity again at full speed (125MB/sec - slowest disk max speed). Now I had tunables at 12800, 7680 and 2880, which previously allowed me to hit the full 125MB/sec and do parity checks in 4 and abit hours, after the changes = 60MB/sec. Now I needed to double them again to get back up to full speed. 27000, 14000, 12500, using the best part of 1GB RAM. Any thoughts on why I suddenly such large values to maximise the performance of the array!?
July 1, 201412 yr Do a more controlled test by seeing what tunables you need on a previous version to maintain full speed. It seems like you updated 2 items at the same time, so in order to rule out adding a new drive to be the cause of your slowdown revert to your previous version and run your speed tests.
August 3, 201411 yr Author Solved the problem - needed to peg UnRAID to 2 cores in syslinux config, now back at 125MB/sec.
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