dick hoogendijk wrote:
> Can I do a zpool scrub on a running server without effecting
> webserving / email serving? I read it is a I/O-intensive operation.
>   

No, it is a read I/O-intensive operation :-)

> Does that mean the server has to be idle? Or better still: go into
> maintenance (init S)? I guess not, but still..
>   


ugh, that would be a bitter pill.  I don't know anyone who would
tolerate a requirement to go into milestone/single-user for scrubs.

The way it works is that ZFS schedules I/O with a priority scheme.
Scrubs have a lower priority than most other operations.  Regular
reads and writes will have higher priority.
 -- richard

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