Sorry, I was wrong that it was you. I just double checked. But there is a new thread as of this morning about this topic where someone is running benchmark tests with numbers titled "Benchmark does not show gains with DB on SSD".
On Wed, Sep 12, 2018 at 12:20 PM David Turner <drakonstein@xxxxxxxxx> wrote:
You already have a thread talking about benchmarking the addition of WAL and DB partitions to an OSD. Why are you creating a new one about the exact same thing? As with everything, the performance increase isn't even solely answerable by which drives you have, there are a lot of factors that could introduce a bottleneck in your cluster. But again, why create a new thread for the exact same topic?On Wed, Sep 12, 2018 at 12:06 PM Marc Roos <M.Roos@xxxxxxxxxxxxxxxxx> wrote:
When having a hdd bluestore osd with collocated wal and db.
- What performance increase can be expected if one would move the wal to
an ssd?
- What performance increase can be expected if one would move the db to
an ssd?
- Would the performance be a lot if you have a very slow hdd (and thus
not so much when you have a very fast hdd (sas 15k))
- It would be best to move the wal first to the ssd, and then maybe also
the db?
In this CERN video (https://youtu.be/OopRMUYiY5E?t=931) of 2015 they are
talking about 5-10x increase etc. But that is filestore of course.
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