[ceph-users] Low traffic Ceph cluster with consumer SSD.

Ashley Merrick singapore at amerrick.co.uk
Sat Nov 24 17:45:38 PST 2018

As it’s consumer hardware / old I am guessing your only be using 1Gbps for
the network.

If so that will definitely be your bottle neck across the whole environment
having both client and replication data sharing a single 1Gbps.

Your SSD’s will sit mostly idle, if you have 10Gbps then different story.


On Sun, 25 Nov 2018 at 1:10 AM, Anton Aleksandrov <anton at aleksandrov.eu>

> Hello community,
> We are building CEPH cluster on pretty old (but free) hardware. We will
> have 12 nodes with 1 OSD per node and migrate data from single RAID5
> setup, so our traffic is not very intense, we basically need more space
> and possibility to expand it.
> We plan to have data on dedicate disk in each node and my question is
> about WAL/DB for Bluestore. How bad would it be to place it on
> system-consumer-SSD? How big risk is it, that everything will get
> "slower than using spinning HDD for the same purpose"? And how big risk
> is it, that our nodes will die, because of SSD lifespan?
> I am sorry, for such untechnical question.
> Regards,
> Anton.
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