armdn wrote:Nope. You are not the one with such trouble. I have the same problem on two different machines. Mac Pro 2008 with 32GB or RAM and Mac Pro 2010 with 128GB of RAM and it is the same thing when I started write operations on pools. The pools itself also different, at first I thought it was hard drive corruption somewhere else, but no, there isn't. I downgraded on MP2008 OpenZFS to version 2.1.0 from 2.2.2 and... everything starts to work smooth and nice. Of course I recreated pool.
On 2.1.6 through 2.2.2 the system caught I/O locks and almost unusable when I started writing anything... After several gigabytes write speed downs to 1-3 mb and huge system locks appears.
While that's not good news it's nice to know it's not just somehow my problem alone! You mention system locks as an issue, how are you monitoring these? I'm hoping my spindumps might show where the time is being wasted, but it can't hurt to get as much information as possible!