Re: Deep scrubbing causes severe I/O stalling

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Am 08.11.2016 um 10:17 schrieb Kees Meijs:
> Hi,
> 
> As promised, our findings so far:
> 
>   * For the time being, the new scrubbing parameters work well.

Which parameters do you refer to? Currently we're on hammer.

>   * Using CFQ for spinners and NOOP voor SSD seems to spread load over
>     the storage cluster a little better than deadline does. However,
>     overall latency seems (just a feeling, no numbers there) a little
>     higher.

This one is a one that has spindles and already runs with CFQ and:
        osd_disk_thread_ioprio_class = idle
        osd_disk_thread_ioprio_priority = 3

Greets,
Stefan

> 
> Cheers,
> Kees
> 
> On 28-10-16 15:37, Kees Meijs wrote:
>>
>> Interesting... We're now running using deadline. In other posts I read
>> about noop for SSDs instead of CFQ.
>>
>> Since we're using spinners with SSD journals; does it make since to
>> mix the scheduler? E.g. CFG for spinners _and_ noop for SSD?
>>
> 
> 
> 
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