On Saturday, April 19, 2014, Mike Dawson <mike.daw...@cloudapt.com> wrote: > > > With a workload consisting of lots of small writes, I've seen client IO > starved with as little as 5Mbps of traffic per host due to spindle > contention once deep-scrub and/or recovery/backfill start. Co-locating OSD > Journals on the same spinners as you have will double that likelihood. >
Yeah. We're working on addressing the collocation issues. > Possible solutions include moving OSD Journals to SSD (with a reasonable > ratio), expanding the cluster, or increasing the performance of underlying > storage. > > We are considering an all SSD cluster. If I'm not mistaken, at that point journal collocation isn't as much of an issue since iops/seek time stop being an issue.
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