[PVE-User] Proxmox + ZFS: Performance issues

Ralf ralf+pve at ramses-pyramidenbau.de
Mon Apr 25 22:38:32 CEST 2016

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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