Hi Hugo, On 21 Aug 2014, at 14:17, Hugo Mills <h.r.mills at reading.ac.uk> wrote: > > Not sure what you mean about colocated journal/OSD. The journals > aren't on the same device as the OSDs. However, all three journals on > each machine are on the same SSD. <embarrassed> I obviously didn?t drink enough coffee this morning. I read your reply as something like ? "On each machine, the three OSD journals live on the same ext4 filesystem on an OSD?. Anyway? what kind of SSD do you have? With iostat -xm 1, do you see high % utilisation on that SSD during these incidents? It could be that you?re exceeding even the iops capacity of the SSD. Cheers, Dan
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