Dear zfs fellows,

during a specific test I have got the impression that scrub may have quite an 
impact on other I/O. CIFS throughput is down to 7 MB/s from 100 MB/s while 
scrub on my main NAS. That is not a surprise as scrub of my raidz2 pool maxes 
out CPU on that machine. (1 Xeon L5410). 
I am running scrubs during week-ends, so this is not a problem. I am asking 
myself however what will happen on larger pools where a scrub pass will take 
days to weeks. Obviously, zfs file systems are much more scalable than CPU 
power ever will be.
Hence, I am seeing a requirement to manage scrub activity so that trade-offs 
can be done to maintain availability and performance of the pool. Does anybody 
know how this is done?

Thanks in advance for any hints,

Regards,

Tonmaus
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