On 04/25/2016 10:14 PM, Lindsay Mathieson wrote: > On 25/04/2016 11:43 PM, Ralf wrote: >> some more random analysis: >> I used atop to debug the problem. >> >> Turned out, that disks are 100% busy and the average io time is beyond >> all hope. ZFS seems to read/write/arrange things in a random and not in >> a sequential way. > > > What does "iotop -P --only" show? That dd is using 100% of io. Ram usage is 5/10 GiB at the moment, so more than enough free ram. > > I suspect lack of ram is your problem. Why do I need so much RAM for mirror raid? All ram-intensive features are turned off.
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