Re: Deep scrubbing causes severe I/O stalling

Kees Meijs <kees@xxxxxxxx> · Tue, 8 Nov 2016 10:17:41 +0100



    Hi,
    As promised, our findings so far:
    
      For the time being, the new scrubbing parameters work well.
      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.
    
    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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