What thread? I have put this, with this specific subject so it is easier to find in the future and this is not a 'sub question' of someone's problem. Hoping for others to post their experience/results. I thought if cern can give estimates, people here can to. -----Original Message----- From: David Turner [mailto:drakonstein@xxxxxxxxx] Sent: woensdag 12 september 2018 18:20 To: Marc Roos Cc: ceph-users Subject: Re: Performance predictions moving bluestore wall, db to ssd 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. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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